v0.0.37

Makefile

@@ -0,0 +1,9 @@
+
+run:
+	echo "This is a library - can't be run" && false
+
+test:
+	go test ./...
+
+version:
+	_data/version.sh

README.md

@@ -3,5 +3,6 @@ BFB goext library
 
 A collection of general & useful library methods
 
-Every subfolder is a seperate dependency and can be imported individually
+This should not have any heavy dependencies (gin, mongo, etc) and add missing basic language features...
 
+Potentially needs `export GOPRIVATE="gogs.mikescher.com"`

_data/version.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -o nounset   # disallow usage of unset vars  ( set -u )
+set -o errexit   # Exit immediately if a pipeline returns non-zero.  ( set -e )
+set -o errtrace  # Allow the above trap be inherited by all functions in the script.  ( set -E )
+set -o pipefail  # Return value of a pipeline is the value of the last (rightmost) command to exit with a non-zero status
+IFS=$'\n\t'      # Set $IFS to only newline and tab.
+
+
+curr_vers=$(git describe --tags --abbrev=0 | sed 's/v//g')
+
+next_ver=$(echo "$curr_vers" | awk -F. -v OFS=. 'NF==1{print ++$NF}; NF>1{if(length($NF+1)>length($NF))$(NF-1)++; $NF=sprintf("%0*d", length($NF), ($NF+1)%(10^length($NF))); print}')
+
+echo ""
+echo "> Current Version: ${curr_vers}"
+echo "> Next    Version: ${next_ver}"
+echo ""
+
+git add --verbose .
+
+git commit -a -m "v${next_ver}"
+
+git tag "v${next_ver}"
+
+git push
+git push --tags
+

confext/confParser.go

@@ -0,0 +1,136 @@
+package confext
+
+import (
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/timeext"
+	"math/bits"
+	"os"
+	"reflect"
+	"strconv"
+	"time"
+)
+
+// ApplyEnvOverrides overrides field values from environment variables
+//
+// fields must be tagged with `env:"env_key"`
+func ApplyEnvOverrides[T any](c *T) error {
+
+	rval := reflect.ValueOf(c).Elem()
+	rtyp := rval.Type()
+
+	for i := 0; i < rtyp.NumField(); i++ {
+
+		rsfield := rtyp.Field(i)
+		rvfield := rval.Field(i)
+
+		envkey := rsfield.Tag.Get("env")
+		if envkey == "" {
+			continue
+		}
+
+		envval, efound := os.LookupEnv(envkey)
+		if !efound {
+			continue
+		}
+
+		if rvfield.Type() == reflect.TypeOf("") {
+
+			rvfield.Set(reflect.ValueOf(envval))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, envval)
+
+		} else if rvfield.Type() == reflect.TypeOf(int(0)) {
+
+			envint, err := strconv.ParseInt(envval, 10, bits.UintSize)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to int (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(int(envint)))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, envval)
+
+		} else if rvfield.Type() == reflect.TypeOf(int64(0)) {
+
+			envint, err := strconv.ParseInt(envval, 10, 64)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to int64 (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(int64(envint)))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, envval)
+
+		} else if rvfield.Type() == reflect.TypeOf(int32(0)) {
+
+			envint, err := strconv.ParseInt(envval, 10, 32)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to int32 (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(int32(envint)))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, envval)
+
+		} else if rvfield.Type() == reflect.TypeOf(int8(0)) {
+
+			envint, err := strconv.ParseInt(envval, 10, 8)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to int32 (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(int8(envint)))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, envval)
+
+		} else if rvfield.Type() == reflect.TypeOf(time.Duration(0)) {
+
+			dur, err := timeext.ParseDurationShortString(envval)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to duration (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(dur))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, dur.String())
+
+		} else if rvfield.Type() == reflect.TypeOf(time.UnixMilli(0)) {
+
+			tim, err := time.Parse(time.RFC3339Nano, envval)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to time.time (value := '%s')", envkey, envval))
+			}
+
+			rvfield.Set(reflect.ValueOf(tim))
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%s'\n", envkey, tim.String())
+
+		} else if rvfield.Type().ConvertibleTo(reflect.TypeOf(int(0))) {
+
+			envint, err := strconv.ParseInt(envval, 10, 8)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Failed to parse env-config variable '%s' to <%s, ,int> (value := '%s')", rvfield.Type().Name(), envkey, envval))
+			}
+
+			envcvl := reflect.ValueOf(envint).Convert(rvfield.Type())
+
+			rvfield.Set(envcvl)
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%v'\n", envkey, envcvl.Interface())
+
+		} else if rvfield.Type().ConvertibleTo(reflect.TypeOf("")) {
+
+			envcvl := reflect.ValueOf(envval).Convert(rvfield.Type())
+
+			rvfield.Set(envcvl)
+
+			fmt.Printf("[CONF] Overwrite config '%s' with '%v'\n", envkey, envcvl.Interface())
+
+		} else {
+			return errors.New(fmt.Sprintf("Unknown kind/type in config: [ %s | %s ]", rvfield.Kind().String(), rvfield.Type().String()))
+		}
+	}
+
+	return nil
+}

confext/confParser_test.go

@@ -0,0 +1,116 @@
+package confext
+
+import (
+	"testing"
+	"time"
+)
+
+func TestApplyEnvOverridesNoop(t *testing.T) {
+
+	type aliasint int
+	type aliasstring string
+
+	type testdata struct {
+		V1 int           `env:"TEST_V1"`
+		VX string        ``
+		V2 string        `env:"TEST_V2"`
+		V3 int8          `env:"TEST_V3"`
+		V4 int32         `env:"TEST_V4"`
+		V5 int64         `env:"TEST_V5"`
+		V6 aliasint      `env:"TEST_V6"`
+		VY aliasint      ``
+		V7 aliasstring   `env:"TEST_V7"`
+		V8 time.Duration `env:"TEST_V8"`
+		V9 time.Time     `env:"TEST_V9"`
+	}
+
+	input := testdata{
+		V1: 1,
+		VX: "X",
+		V2: "2",
+		V3: 3,
+		V4: 4,
+		V5: 5,
+		V6: 6,
+		VY: 99,
+		V7: "7",
+		V8: 9,
+		V9: time.Unix(1671102873, 0),
+	}
+
+	output := input
+
+	err := ApplyEnvOverrides(&output)
+	if err != nil {
+		t.Errorf("%v", err)
+		t.FailNow()
+	}
+
+	assertEqual(t, input, output)
+}
+
+func TestApplyEnvOverridesSimple(t *testing.T) {
+
+	type aliasint int
+	type aliasstring string
+
+	type testdata struct {
+		V1 int           `env:"TEST_V1"`
+		VX string        ``
+		V2 string        `env:"TEST_V2"`
+		V3 int8          `env:"TEST_V3"`
+		V4 int32         `env:"TEST_V4"`
+		V5 int64         `env:"TEST_V5"`
+		V6 aliasint      `env:"TEST_V6"`
+		VY aliasint      ``
+		V7 aliasstring   `env:"TEST_V7"`
+		V8 time.Duration `env:"TEST_V8"`
+		V9 time.Time     `env:"TEST_V9"`
+	}
+
+	data := testdata{
+		V1: 1,
+		VX: "X",
+		V2: "2",
+		V3: 3,
+		V4: 4,
+		V5: 5,
+		V6: 6,
+		VY: 99,
+		V7: "7",
+		V8: 9,
+		V9: time.Unix(1671102873, 0),
+	}
+
+	t.Setenv("TEST_V1", "846")
+	t.Setenv("TEST_V2", "hello_world")
+	t.Setenv("TEST_V3", "6")
+	t.Setenv("TEST_V4", "333")
+	t.Setenv("TEST_V5", "-937")
+	t.Setenv("TEST_V6", "070")
+	t.Setenv("TEST_V7", "AAAAAA")
+	t.Setenv("TEST_V8", "1min4s")
+	t.Setenv("TEST_V9", "2009-11-10T23:00:00Z")
+
+	err := ApplyEnvOverrides(&data)
+	if err != nil {
+		t.Errorf("%v", err)
+		t.FailNow()
+	}
+
+	assertEqual(t, data.V1, 846)
+	assertEqual(t, data.V2, "hello_world")
+	assertEqual(t, data.V3, 6)
+	assertEqual(t, data.V4, 333)
+	assertEqual(t, data.V5, -937)
+	assertEqual(t, data.V6, 70)
+	assertEqual(t, data.V7, "AAAAAA")
+	assertEqual(t, data.V8, time.Second*64)
+	assertEqual(t, data.V9, time.Unix(1257894000, 0).UTC())
+}
+
+func assertEqual[T comparable](t *testing.T, actual T, expected T) {
+	if actual != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual, expected)
+	}
+}

dataext/bufferedReadCloser.go

@@ -1,56 +1,157 @@
 package dataext
 
-import "io"
+import (
+	"errors"
+	"io"
+)
+
+type brcMode int
+
+const (
+	modeSourceReading  = 0
+	modeSourceFinished = 1
+	modeBufferReading  = 2
+	modeBufferFinished = 3
+)
 
 type BufferedReadCloser interface {
 	io.ReadCloser
 	BufferedAll() ([]byte, error)
+	Reset() error
 }
 
 type bufferedReadCloser struct {
 	buffer []byte
 	inner  io.ReadCloser
-	finished bool
-}
-
-func (b *bufferedReadCloser) Read(p []byte) (int, error) {
-
-	n, err := b.inner.Read(p)
-	if n > 0 {
-		b.buffer = append(b.buffer, p[0:n]...)
-	}
-
-	if err == io.EOF {
-		b.finished = true
-	}
-
-	return n, err
+	mode   brcMode
+	off    int
 }
 
 func NewBufferedReadCloser(sub io.ReadCloser) BufferedReadCloser {
 	return &bufferedReadCloser{
 		buffer: make([]byte, 0, 1024),
 		inner:  sub,
-		finished: false,
+		mode:   modeSourceReading,
+		off:    0,
+	}
+}
+
+func (b *bufferedReadCloser) Read(p []byte) (int, error) {
+	switch b.mode {
+	case modeSourceReading:
+		n, err := b.inner.Read(p)
+		if n > 0 {
+			b.buffer = append(b.buffer, p[0:n]...)
+		}
+
+		if err == io.EOF {
+			b.mode = modeSourceFinished
+		}
+
+		return n, err
+
+	case modeSourceFinished:
+		return 0, io.EOF
+
+	case modeBufferReading:
+
+		if len(b.buffer) <= b.off {
+			b.mode = modeBufferFinished
+			if len(p) == 0 {
+				return 0, nil
+			}
+			return 0, io.EOF
+		}
+
+		n := copy(p, b.buffer[b.off:])
+		b.off += n
+		return n, nil
+
+	case modeBufferFinished:
+		return 0, io.EOF
+
+	default:
+		return 0, errors.New("object in undefined status")
 	}
 }
 
 func (b *bufferedReadCloser) Close() error {
-	err := b.inner.Close()
+	switch b.mode {
+	case modeSourceReading:
+		_, err := b.BufferedAll()
 		if err != nil {
-		b.finished = true
-	}
 			return err
 		}
+		err = b.inner.Close()
+		if err != nil {
+			return err
+		}
+		b.mode = modeSourceFinished
+		return nil
+
+	case modeSourceFinished:
+		return nil
+
+	case modeBufferReading:
+		b.mode = modeBufferFinished
+		return nil
+
+	case modeBufferFinished:
+		return nil
+
+	default:
+		return errors.New("object in undefined status")
+	}
+
+}
 
 func (b *bufferedReadCloser) BufferedAll() ([]byte, error) {
+	switch b.mode {
+	case modeSourceReading:
 		arr := make([]byte, 1024)
-	for !b.finished {
+		for b.mode == modeSourceReading {
 			_, err := b.Read(arr)
 			if err != nil && err != io.EOF {
 				return nil, err
 			}
 		}
-
 		return b.buffer, nil
+
+	case modeSourceFinished:
+		return b.buffer, nil
+
+	case modeBufferReading:
+		return b.buffer, nil
+
+	case modeBufferFinished:
+		return b.buffer, nil
+
+	default:
+		return nil, errors.New("object in undefined status")
+	}
+}
+
+func (b *bufferedReadCloser) Reset() error {
+	switch b.mode {
+	case modeSourceReading:
+		fallthrough
+	case modeSourceFinished:
+		err := b.Close()
+		if err != nil {
+			return err
+		}
+		b.mode = modeBufferReading
+		b.off = 0
+		return nil
+
+	case modeBufferReading:
+		fallthrough
+	case modeBufferFinished:
+		b.mode = modeBufferReading
+		b.off = 0
+		return nil
+
+	default:
+		return errors.New("object in undefined status")
+	}
 }

dataext/lruMap_test.go

@@ -1,7 +1,7 @@
 package dataext
 
 import (
-	"go.mongodb.org/mongo-driver/bson/primitive"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"math/rand"
 	"strconv"
 	"testing"
@@ -251,18 +251,21 @@ func randomKey() string {
 }
 
 func randomVal() LRUData {
-	v := primitive.NewObjectID()
+	v, err := langext.NewHexUUID()
+	if err != nil {
+		panic(err)
+	}
 	return &v
 }
 
 func eq(a LRUData, b LRUData) bool {
-	v1, ok1 := a.(*primitive.ObjectID)
-	v2, ok2 := b.(*primitive.ObjectID)
+	v1, ok1 := a.(*string)
+	v2, ok2 := b.(*string)
 	if ok1 && ok2 {
 		if v1 == nil || v2 == nil {
 			return false
 		}
-		return v1.Hex() == v2.Hex()
+		return v1 == v2
 	}
 
 	return false

dataext/merge.go

@@ -0,0 +1,35 @@
+package dataext
+
+import (
+	"reflect"
+)
+
+func ObjectMerge[T1 any, T2 any](base T1, override T2) T1 {
+
+	reflBase := reflect.ValueOf(&base).Elem()
+	reflOvrd := reflect.ValueOf(&override).Elem()
+
+	for i := 0; i < reflBase.NumField(); i++ {
+
+		fieldBase := reflBase.Field(i)
+		fieldOvrd := reflOvrd.Field(i)
+
+		if fieldBase.Kind() != reflect.Ptr || fieldOvrd.Kind() != reflect.Ptr {
+			continue
+		}
+
+		kindBase := fieldBase.Type().Elem().Kind()
+		kindOvrd := fieldOvrd.Type().Elem().Kind()
+
+		if kindBase != kindOvrd {
+			continue
+		}
+
+		if !fieldOvrd.IsNil() {
+			fieldBase.Set(fieldOvrd.Elem().Addr())
+		}
+
+	}
+
+	return base
+}

dataext/merge_test.go

@@ -0,0 +1,70 @@
+package dataext
+
+import (
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"testing"
+)
+
+func TestObjectMerge(t *testing.T) {
+	type A struct {
+		Field1   *int
+		Field2   *string
+		Field3   *float64
+		Field4   *bool
+		OnlyA    int64
+		DiffType int
+	}
+	type B struct {
+		Field1   *int
+		Field2   *string
+		Field3   *float64
+		Field4   *bool
+		OnlyB    int64
+		DiffType string
+	}
+
+	valueA := A{
+		Field1:   nil,
+		Field2:   langext.Ptr("99"),
+		Field3:   langext.Ptr(12.2),
+		Field4:   nil,
+		OnlyA:    1,
+		DiffType: 2,
+	}
+
+	valueB := B{
+		Field1:   langext.Ptr(12),
+		Field2:   nil,
+		Field3:   langext.Ptr(13.2),
+		Field4:   nil,
+		OnlyB:    1,
+		DiffType: "X",
+	}
+
+	valueMerge := ObjectMerge(valueA, valueB)
+
+	assertPtrEqual(t, "Field1", valueMerge.Field1, valueB.Field1)
+	assertPtrEqual(t, "Field2", valueMerge.Field2, valueA.Field2)
+	assertPtrEqual(t, "Field3", valueMerge.Field3, valueB.Field3)
+	assertPtrEqual(t, "Field4", valueMerge.Field4, nil)
+
+}
+
+func assertPtrEqual[T1 comparable](t *testing.T, ident string, actual *T1, expected *T1) {
+	if actual == nil && expected == nil {
+		return
+	}
+	if actual != nil && expected != nil {
+		if *actual != *expected {
+			t.Errorf("[%s] values differ: Actual: '%v', Expected: '%v'", ident, *actual, *expected)
+		} else {
+			return
+		}
+	}
+	if actual == nil && expected != nil {
+		t.Errorf("[%s] values differ: Actual: nil, Expected: not-nil", ident)
+	}
+	if actual != nil && expected == nil {
+		t.Errorf("[%s] values differ: Actual: not-nil, Expected: nil", ident)
+	}
+}

dataext/structHash.go

@@ -0,0 +1,254 @@
+package dataext
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"hash"
+	"io"
+	"reflect"
+	"sort"
+)
+
+type StructHashOptions struct {
+	HashAlgo    hash.Hash
+	Tag         *string
+	SkipChannel bool
+	SkipFunc    bool
+}
+
+func StructHash(dat any, opt ...StructHashOptions) (r []byte, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			r = nil
+			err = errors.New(fmt.Sprintf("recovered panic: %v", rec))
+		}
+	}()
+
+	shopt := StructHashOptions{}
+	if len(opt) > 1 {
+		return nil, errors.New("multiple options supplied")
+	} else if len(opt) == 1 {
+		shopt = opt[0]
+	}
+
+	if shopt.HashAlgo == nil {
+		shopt.HashAlgo = sha256.New()
+	}
+
+	writer := new(bytes.Buffer)
+
+	if langext.IsNil(dat) {
+		shopt.HashAlgo.Reset()
+		shopt.HashAlgo.Write(writer.Bytes())
+		res := shopt.HashAlgo.Sum(nil)
+		return res, nil
+	}
+
+	err = binarize(writer, reflect.ValueOf(dat), shopt)
+	if err != nil {
+		return nil, err
+	}
+
+	shopt.HashAlgo.Reset()
+	shopt.HashAlgo.Write(writer.Bytes())
+	res := shopt.HashAlgo.Sum(nil)
+
+	return res, nil
+}
+
+func writeBinarized(writer io.Writer, dat any) error {
+	tmp := bytes.Buffer{}
+	err := binary.Write(&tmp, binary.LittleEndian, dat)
+	if err != nil {
+		return err
+	}
+	err = binary.Write(writer, binary.LittleEndian, uint64(tmp.Len()))
+	if err != nil {
+		return err
+	}
+	_, err = writer.Write(tmp.Bytes())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func binarize(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	var err error
+
+	err = binary.Write(writer, binary.LittleEndian, uint8(dat.Kind()))
+	switch dat.Kind() {
+	case reflect.Ptr, reflect.Map, reflect.Array, reflect.Chan, reflect.Slice, reflect.Interface:
+		if dat.IsNil() {
+			err = binary.Write(writer, binary.LittleEndian, uint64(0))
+			if err != nil {
+				return err
+			}
+			return nil
+		}
+	}
+
+	err = binary.Write(writer, binary.LittleEndian, uint64(len(dat.Type().String())))
+	if err != nil {
+		return err
+	}
+	_, err = writer.Write([]byte(dat.Type().String()))
+	if err != nil {
+		return err
+	}
+
+	switch dat.Type().Kind() {
+	case reflect.Invalid:
+		return errors.New("cannot binarize value of kind <Invalid>")
+	case reflect.Bool:
+		return writeBinarized(writer, dat.Bool())
+	case reflect.Int:
+		return writeBinarized(writer, int64(dat.Int()))
+	case reflect.Int8:
+		fallthrough
+	case reflect.Int16:
+		fallthrough
+	case reflect.Int32:
+		fallthrough
+	case reflect.Int64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Uint:
+		return writeBinarized(writer, uint64(dat.Int()))
+	case reflect.Uint8:
+		fallthrough
+	case reflect.Uint16:
+		fallthrough
+	case reflect.Uint32:
+		fallthrough
+	case reflect.Uint64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Uintptr:
+		return errors.New("cannot binarize value of kind <Uintptr>")
+	case reflect.Float32:
+		fallthrough
+	case reflect.Float64:
+		return writeBinarized(writer, dat.Interface())
+	case reflect.Complex64:
+		return errors.New("cannot binarize value of kind <Complex64>")
+	case reflect.Complex128:
+		return errors.New("cannot binarize value of kind <Complex128>")
+	case reflect.Slice:
+		fallthrough
+	case reflect.Array:
+		return binarizeArrayOrSlice(writer, dat, opt)
+	case reflect.Chan:
+		if opt.SkipChannel {
+			return nil
+		}
+		return errors.New("cannot binarize value of kind <Chan>")
+	case reflect.Func:
+		if opt.SkipFunc {
+			return nil
+		}
+		return errors.New("cannot binarize value of kind <Func>")
+	case reflect.Interface:
+		return binarize(writer, dat.Elem(), opt)
+	case reflect.Map:
+		return binarizeMap(writer, dat, opt)
+	case reflect.Pointer:
+		return binarize(writer, dat.Elem(), opt)
+	case reflect.String:
+		v := dat.String()
+		err = binary.Write(writer, binary.LittleEndian, uint64(len(v)))
+		if err != nil {
+			return err
+		}
+		_, err = writer.Write([]byte(v))
+		if err != nil {
+			return err
+		}
+		return nil
+	case reflect.Struct:
+		return binarizeStruct(writer, dat, opt)
+	case reflect.UnsafePointer:
+		return errors.New("cannot binarize value of kind <UnsafePointer>")
+	default:
+		return errors.New("cannot binarize value of unknown kind <" + dat.Type().Kind().String() + ">")
+	}
+}
+
+func binarizeStruct(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.NumField()))
+	if err != nil {
+		return err
+	}
+
+	for i := 0; i < dat.NumField(); i++ {
+
+		if opt.Tag != nil {
+			if _, ok := dat.Type().Field(i).Tag.Lookup(*opt.Tag); !ok {
+				continue
+			}
+		}
+
+		err = binary.Write(writer, binary.LittleEndian, uint64(len(dat.Type().Field(i).Name)))
+		if err != nil {
+			return err
+		}
+		_, err = writer.Write([]byte(dat.Type().Field(i).Name))
+		if err != nil {
+			return err
+		}
+
+		err = binarize(writer, dat.Field(i), opt)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func binarizeArrayOrSlice(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.Len()))
+	if err != nil {
+		return err
+	}
+
+	for i := 0; i < dat.Len(); i++ {
+		err := binarize(writer, dat.Index(i), opt)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func binarizeMap(writer io.Writer, dat reflect.Value, opt StructHashOptions) error {
+	err := binary.Write(writer, binary.LittleEndian, uint64(dat.Len()))
+	if err != nil {
+		return err
+	}
+
+	sub := make([][]byte, 0, dat.Len())
+
+	for _, k := range dat.MapKeys() {
+		tmp := bytes.Buffer{}
+		err = binarize(&tmp, dat.MapIndex(k), opt)
+		if err != nil {
+			return err
+		}
+		sub = append(sub, tmp.Bytes())
+	}
+
+	sort.Slice(sub, func(i1, i2 int) bool { return bytes.Compare(sub[i1], sub[i2]) < 0 })
+
+	for _, v := range sub {
+		_, err = writer.Write(v)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

dataext/structHash_test.go

@@ -0,0 +1,143 @@
+package dataext
+
+import (
+	"encoding/hex"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"testing"
+)
+
+func noErrStructHash(t *testing.T, dat any, opt ...StructHashOptions) []byte {
+	res, err := StructHash(dat, opt...)
+	if err != nil {
+		t.Error(err)
+		t.FailNow()
+		return nil
+	}
+	return res
+}
+
+func TestStructHashSimple(t *testing.T) {
+
+	assertEqual(t, "209bf774af36cc3a045c152d9f1269ef3684ad819c1359ee73ff0283a308fefa", noErrStructHash(t, "Hello"))
+	assertEqual(t, "c32f3626b981ae2997db656f3acad3f1dc9d30ef6b6d14296c023e391b25f71a", noErrStructHash(t, 0))
+	assertEqual(t, "01b781b03e9586b257d387057dfc70d9f06051e7d3c1e709a57e13cc8daf3e35", noErrStructHash(t, []byte{}))
+	assertEqual(t, "93e1dcd45c732fe0079b0fb3204c7c803f0921835f6bfee2e6ff263e73eed53c", noErrStructHash(t, []int{}))
+	assertEqual(t, "54f637a376aad55b3160d98ebbcae8099b70d91b9400df23fb3709855d59800a", noErrStructHash(t, []int{1, 2, 3}))
+	assertEqual(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", noErrStructHash(t, nil))
+	assertEqual(t, "349a7db91aa78fd30bbaa7c7f9c7bfb2fcfe72869b4861162a96713a852f60d3", noErrStructHash(t, []any{1, "", nil}))
+	assertEqual(t, "ca51aab87808bf0062a4a024de6aac0c2bad54275cc857a4944569f89fd245ad", noErrStructHash(t, struct{}{}))
+
+}
+
+func TestStructHashSimpleStruct(t *testing.T) {
+
+	type t0 struct {
+		F1 int
+		F2 []string
+		F3 *int
+	}
+
+	assertEqual(t, "a90bff751c70c738bb5cfc9b108e783fa9c19c0bc9273458e0aaee6e74aa1b92", noErrStructHash(t, t0{
+		F1: 10,
+		F2: []string{"1", "2", "3"},
+		F3: nil,
+	}))
+
+	assertEqual(t, "5d09090dc34ac59dd645f197a255f653387723de3afa1b614721ea5a081c675f", noErrStructHash(t, t0{
+		F1: 10,
+		F2: []string{"1", "2", "3"},
+		F3: langext.Ptr(99),
+	}))
+
+}
+
+func TestStructHashLayeredStruct(t *testing.T) {
+
+	type t1_1 struct {
+		F10 float32
+		F12 float64
+		F15 bool
+	}
+	type t1_2 struct {
+		SV1 *t1_1
+		SV2 *t1_1
+		SV3 t1_1
+	}
+
+	assertEqual(t, "fd4ca071fb40a288fee4b7a3dfdaab577b30cb8f80f81ec511e7afd72dc3b469", noErrStructHash(t, t1_2{
+		SV1: nil,
+		SV2: nil,
+		SV3: t1_1{
+			F10: 1,
+			F12: 2,
+			F15: false,
+		},
+	}))
+	assertEqual(t, "3fbf7c67d8121deda075cc86319a4e32d71744feb2cebf89b43bc682f072a029", noErrStructHash(t, t1_2{
+		SV1: nil,
+		SV2: &t1_1{},
+		SV3: t1_1{
+			F10: 3,
+			F12: 4,
+			F15: true,
+		},
+	}))
+	assertEqual(t, "b1791ccd1b346c3ede5bbffda85555adcd8216b93ffca23f14fe175ec47c5104", noErrStructHash(t, t1_2{
+		SV1: &t1_1{},
+		SV2: &t1_1{},
+		SV3: t1_1{
+			F10: 5,
+			F12: 6,
+			F15: false,
+		},
+	}))
+
+}
+
+func TestStructHashMap(t *testing.T) {
+
+	type t0 struct {
+		F1 int
+		F2 map[string]int
+	}
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: map[string]int{
+			"x": 1,
+			"0": 2,
+			"a": 99,
+		},
+	}))
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: map[string]int{
+			"a": 99,
+			"x": 1,
+			"0": 2,
+		},
+	}))
+
+	m3 := make(map[string]int, 99)
+	m3["a"] = 0
+	m3["x"] = 0
+	m3["0"] = 0
+
+	m3["0"] = 99
+	m3["x"] = 1
+	m3["a"] = 2
+
+	assertEqual(t, "d50c53ad1fafb448c33fddd5aca01a86a2edf669ce2ecab07ba6fe877951d824", noErrStructHash(t, t0{
+		F1: 10,
+		F2: m3,
+	}))
+
+}
+
+func assertEqual(t *testing.T, expected string, actual []byte) {
+	actualStr := hex.EncodeToString(actual)
+	if actualStr != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actualStr, expected)
+	}
+}

go.mod

@@ -1,3 +1,10 @@
-module blackforestbytes.com/goext/lang
+module gogs.mikescher.com/BlackForestBytes/goext
 
 go 1.19
+
+require (
+	golang.org/x/sys v0.1.0
+	golang.org/x/term v0.1.0
+)
+
+require github.com/jmoiron/sqlx v1.3.5 // indirect

go.sum

@@ -0,0 +1,9 @@
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jmoiron/sqlx v1.3.5 h1:vFFPA71p1o5gAeqtEAwLU4dnX2napprKtHr7PYIcN3g=
+github.com/jmoiron/sqlx v1.3.5/go.mod h1:nRVWtLre0KfCLJvgxzCsLVMogSvQ1zNJtpYr2Ccp0mQ=
+github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
+golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=

langext/array.go

@@ -4,6 +4,24 @@ import (
 	"reflect"
 )
 
+func BoolCount(arr ...bool) int {
+	c := 0
+	for _, v := range arr {
+		if v {
+			c++
+		}
+	}
+	return c
+}
+
+func Range[T IntegerConstraint](start T, end T) []T {
+	r := make([]T, 0, end-start)
+	for i := start; i < end; i++ {
+		r = append(r, i)
+	}
+	return r
+}
+
 func ForceArray[T any](v []T) []T {
 	if v == nil {
 		return make([]T, 0)
@@ -52,7 +70,73 @@ func ArrEqualsExact[T comparable](arr1 []T, arr2 []T) bool {
 	return true
 }
 
-func ArrAll(arr interface{}, fn func(int) bool) bool {
+func ArrAll[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if !fn(av) {
+			return false
+		}
+	}
+	return true
+}
+
+func ArrAllErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if !v {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func ArrNone[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if fn(av) {
+			return false
+		}
+	}
+	return true
+}
+
+func ArrNoneErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if v {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func ArrAny[T any](arr []T, fn func(T) bool) bool {
+	for _, av := range arr {
+		if fn(av) {
+			return true
+		}
+	}
+	return false
+}
+
+func ArrAnyErr[T any](arr []T, fn func(T) (bool, error)) (bool, error) {
+	for _, av := range arr {
+		v, err := fn(av)
+		if err != nil {
+			return false, err
+		}
+		if v {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func ArrIdxAll(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if !fn(i) {
@@ -62,7 +146,7 @@ func ArrAll(arr interface{}, fn func(int) bool) bool {
 	return true
 }
 
-func ArrAllErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxAllErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -76,7 +160,7 @@ func ArrAllErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return true, nil
 }
 
-func ArrNone(arr interface{}, fn func(int) bool) bool {
+func ArrIdxNone(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if fn(i) {
@@ -86,7 +170,7 @@ func ArrNone(arr interface{}, fn func(int) bool) bool {
 	return true
 }
 
-func ArrNoneErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxNoneErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -100,7 +184,7 @@ func ArrNoneErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return true, nil
 }
 
-func ArrAny(arr interface{}, fn func(int) bool) bool {
+func ArrIdxAny(arr any, fn func(int) bool) bool {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		if fn(i) {
@@ -110,7 +194,7 @@ func ArrAny(arr interface{}, fn func(int) bool) bool {
 	return false
 }
 
-func ArrAnyErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
+func ArrIdxAnyErr(arr any, fn func(int) (bool, error)) (bool, error) {
 	av := reflect.ValueOf(arr)
 	for i := 0; i < av.Len(); i++ {
 		v, err := fn(i)
@@ -124,6 +208,46 @@ func ArrAnyErr(arr interface{}, fn func(int) (bool, error)) (bool, error) {
 	return false, nil
 }
 
+func ArrFirst[T any](arr []T, comp func(v T) bool) (T, bool) {
+	for _, v := range arr {
+		if comp(v) {
+			return v, true
+		}
+	}
+	return *new(T), false
+}
+
+func ArrLast[T any](arr []T, comp func(v T) bool) (T, bool) {
+	found := false
+	result := *new(T)
+	for _, v := range arr {
+		if comp(v) {
+			found = true
+			result = v
+		}
+	}
+	return result, found
+}
+
+func ArrFirstIndex[T comparable](arr []T, needle T) int {
+	for i, v := range arr {
+		if v == needle {
+			return i
+		}
+	}
+	return -1
+}
+
+func ArrLastIndex[T comparable](arr []T, needle T) int {
+	result := -1
+	for i, v := range arr {
+		if v == needle {
+			result = i
+		}
+	}
+	return result
+}
+
 func AddToSet[T comparable](set []T, add T) []T {
 	for _, v := range set {
 		if v == add {
@@ -132,3 +256,19 @@ func AddToSet[T comparable](set []T, add T) []T {
 	}
 	return append(set, add)
 }
+
+func ArrMap[T1 any, T2 any](arr []T1, conv func(v T1) T2) []T2 {
+	r := make([]T2, len(arr))
+	for i, v := range arr {
+		r[i] = conv(v)
+	}
+	return r
+}
+
+func ArrSum[T NumberConstraint](arr []T) T {
+	var r T = 0
+	for _, v := range arr {
+		r += v
+	}
+	return r
+}

langext/base62.go

@@ -0,0 +1,74 @@
+package langext
+
+import (
+	"crypto/rand"
+	"errors"
+	"math"
+	"math/big"
+	"strings"
+)
+
+var (
+	base62Base         = uint64(62)
+	base62CharacterSet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+)
+
+func RandBase62(rlen int) string {
+	bi52 := big.NewInt(int64(len(base62CharacterSet)))
+
+	randMax := big.NewInt(math.MaxInt64)
+
+	r := ""
+
+	for i := 0; i < rlen; i++ {
+		v, err := rand.Int(rand.Reader, randMax)
+		if err != nil {
+			panic(err)
+		}
+
+		r += string(base62CharacterSet[v.Mod(v, bi52).Int64()])
+	}
+
+	return r
+}
+
+func EncodeBase62(num uint64) string {
+	if num == 0 {
+		return "0"
+	}
+
+	b := make([]byte, 0)
+
+	// loop as long the num is bigger than zero
+	for num > 0 {
+		r := num % base62Base
+
+		num -= r
+		num /= base62Base
+
+		b = append([]byte{base62CharacterSet[int(r)]}, b...)
+	}
+
+	return string(b)
+}
+
+func DecodeBase62(str string) (uint64, error) {
+	if str == "" {
+		return 0, errors.New("empty string")
+	}
+
+	result := uint64(0)
+
+	for _, v := range str {
+		result *= base62Base
+
+		pos := strings.IndexRune(base62CharacterSet, v)
+		if pos == -1 {
+			return 0, errors.New("invalid character: " + string(v))
+		}
+
+		result += uint64(pos)
+	}
+
+	return result, nil
+}

langext/bool.go

@@ -0,0 +1,17 @@
+package langext
+
+func FormatBool(v bool, strTrue string, strFalse string) string {
+	if v {
+		return strTrue
+	} else {
+		return strFalse
+	}
+}
+
+func Conditional[T any](v bool, resTrue T, resFalse T) T {
+	if v {
+		return resTrue
+	} else {
+		return resFalse
+	}
+}

langext/bytes.go

@@ -1,6 +1,9 @@
 package langext
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+)
 
 func FormatBytesToSI(b uint64) string {
 	const unit = 1000
@@ -14,3 +17,30 @@ func FormatBytesToSI(b uint64) string {
 	}
 	return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
 }
+
+func BytesXOR(a []byte, b []byte) ([]byte, error) {
+	if len(a) != len(b) {
+		return nil, errors.New("length mismatch")
+	}
+
+	r := make([]byte, len(a))
+
+	for i := 0; i < len(a); i++ {
+		r[i] = a[i] ^ b[i]
+	}
+
+	return r, nil
+}
+
+func FormatBytes(b int64) string {
+	const unit = 1024
+	if b < unit {
+		return fmt.Sprintf("%d B", b)
+	}
+	div, exp := int64(unit), 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf("%.1f %ciB", float64(b)/float64(div), "KMGTPE"[exp])
+}

langext/compare.go

@@ -30,3 +30,34 @@ func CompareIntArr(arr1 []int, arr2 []int) bool {
 
 	return false
 }
+
+func CompareArr[T OrderedConstraint](arr1 []T, arr2 []T) bool {
+
+	for i := 0; i < len(arr1) || i < len(arr2); i++ {
+
+		if i < len(arr1) && i < len(arr2) {
+
+			if arr1[i] < arr2[i] {
+				return true
+			} else if arr1[i] > arr2[i] {
+				return false
+			} else {
+				continue
+			}
+
+		}
+
+		if i < len(arr1) {
+
+			return true
+
+		} else { // if i < len(arr2)
+
+			return false
+
+		}
+
+	}
+
+	return false
+}

langext/coords.go

@@ -0,0 +1,21 @@
+package langext
+
+import "math"
+
+func DegToRad(deg float64) float64 {
+	return deg * (math.Pi / 180.0)
+}
+
+func RadToDeg(rad float64) float64 {
+	return rad / (math.Pi * 180.0)
+}
+
+func GeoDistance(lon1 float64, lat1 float64, lon2 float64, lat2 float64) float64 {
+	var d1 = DegToRad(lat1)
+	var num1 = DegToRad(lon1)
+	var d2 = DegToRad(lat2)
+	var num2 = DegToRad(lon2) - num1
+	var d3 = math.Pow(math.Sin((d2-d1)/2.0), 2.0) + math.Cos(d1)*math.Cos(d2)*math.Pow(math.Sin(num2/2.0), 2.0)
+
+	return 6376500.0 * (2.0 * math.Atan2(math.Sqrt(d3), math.Sqrt(1.0-d3)))
+}

langext/generics.go

@@ -0,0 +1,33 @@
+package langext
+
+type IntConstraint interface {
+	int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64
+}
+
+type SignedConstraint interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}
+
+type UnsignedConstraint interface {
+	~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
+}
+
+type IntegerConstraint interface {
+	SignedConstraint | UnsignedConstraint
+}
+
+type FloatConstraint interface {
+	~float32 | ~float64
+}
+
+type ComplexConstraint interface {
+	~complex64 | ~complex128
+}
+
+type OrderedConstraint interface {
+	IntegerConstraint | FloatConstraint | ~string
+}
+
+type NumberConstraint interface {
+	IntegerConstraint | FloatConstraint
+}

langext/json.go

@@ -0,0 +1,65 @@
+package langext
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+type H map[string]any
+
+type A []any
+
+func TryPrettyPrintJson(str string) string {
+	var prettyJSON bytes.Buffer
+	if err := json.Indent(&prettyJSON, []byte(str), "", "    "); err != nil {
+		return str
+	}
+	return prettyJSON.String()
+}
+
+func PrettyPrintJson(str string) (string, bool) {
+	var prettyJSON bytes.Buffer
+	if err := json.Indent(&prettyJSON, []byte(str), "", "    "); err != nil {
+		return str, false
+	}
+	return prettyJSON.String(), true
+}
+
+func PatchJson[JV string | []byte](rawjson JV, key string, value any) (JV, error) {
+	var err error
+
+	var jsonpayload map[string]any
+	err = json.Unmarshal([]byte(rawjson), &jsonpayload)
+	if err != nil {
+		return *new(JV), fmt.Errorf("failed to unmarshal payload: %w", err)
+	}
+
+	jsonpayload[key] = value
+
+	newjson, err := json.Marshal(jsonpayload)
+	if err != nil {
+		return *new(JV), fmt.Errorf("failed to re-marshal payload: %w", err)
+	}
+
+	return JV(newjson), nil
+}
+
+func PatchRemJson[JV string | []byte](rawjson JV, key string) (JV, error) {
+	var err error
+
+	var jsonpayload map[string]any
+	err = json.Unmarshal([]byte(rawjson), &jsonpayload)
+	if err != nil {
+		return *new(JV), fmt.Errorf("failed to unmarshal payload: %w", err)
+	}
+
+	delete(jsonpayload, key)
+
+	newjson, err := json.Marshal(jsonpayload)
+	if err != nil {
+		return *new(JV), fmt.Errorf("failed to re-marshal payload: %w", err)
+	}
+
+	return JV(newjson), nil
+}

langext/maps.go

@@ -0,0 +1,9 @@
+package langext
+
+func MapKeyArr[T comparable, V any](v map[T]V) []T {
+	result := make([]T, 0, len(v))
+	for k := range v {
+		result = append(result, k)
+	}
+	return result
+}

langext/os.go

@@ -0,0 +1,11 @@
+package langext
+
+import "os"
+
+func FileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}

langext/rand.go

@@ -0,0 +1,15 @@
+package langext
+
+import (
+	"crypto/rand"
+	"io"
+)
+
+func RandBytes(size int) []byte {
+	b := make([]byte, size)
+	_, err := io.ReadFull(rand.Reader, b)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}

langext/string.go

@@ -61,3 +61,57 @@ func ConvertStringerArray[T fmt.Stringer](inarr []T) []string {
 	}
 	return result
 }
+
+func StrRunePadLeft(str string, pad string, padlen int) string {
+	if pad == "" {
+		pad = " "
+	}
+
+	if len([]rune(str)) >= padlen {
+		return str
+	}
+
+	return strings.Repeat(pad, padlen-len([]rune(str)))[0:(padlen-len([]rune(str)))] + str
+}
+
+func StrRunePadRight(str string, pad string, padlen int) string {
+	if pad == "" {
+		pad = " "
+	}
+
+	if len([]rune(str)) >= padlen {
+		return str
+	}
+
+	return str + strings.Repeat(pad, padlen-len([]rune(str)))[0:(padlen-len([]rune(str)))]
+}
+
+func Indent(str string, pad string) string {
+	eonl := strings.HasSuffix(str, "\n")
+	r := ""
+	for _, v := range strings.Split(str, "\n") {
+		r += pad + v + "\n"
+	}
+
+	if eonl {
+		r = r[0 : len(r)-1]
+	}
+
+	return r
+}
+
+func NumToStringOpt[V IntConstraint](v *V, fallback string) string {
+	if v == nil {
+		return fallback
+	} else {
+		return fmt.Sprintf("%d", v)
+	}
+}
+
+func StrRepeat(val string, count int) string {
+	r := ""
+	for i := 0; i < count; i++ {
+		r += val
+	}
+	return r
+}

langext/uuid.go

@@ -0,0 +1,134 @@
+package langext
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"io"
+	"strings"
+)
+
+func NewUUID() ([16]byte, error) {
+	var uuid [16]byte
+	_, err := io.ReadFull(rand.Reader, uuid[:])
+	if err != nil {
+		return [16]byte{}, err
+	}
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	return uuid, nil
+}
+
+func NewHexUUID() (string, error) {
+	uuid, err := NewUUID()
+	if err != nil {
+		return "", err
+	}
+
+	// Result: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+
+	var dst = make([]byte, 36)
+
+	hex.Encode(dst, uuid[:4])
+	dst[8] = '-'
+	hex.Encode(dst[9:13], uuid[4:6])
+	dst[13] = '-'
+	hex.Encode(dst[14:18], uuid[6:8])
+	dst[18] = '-'
+	hex.Encode(dst[19:23], uuid[8:10])
+	dst[23] = '-'
+	hex.Encode(dst[24:], uuid[10:])
+
+	return string(dst), nil
+}
+
+func NewUpperHexUUID() (string, error) {
+	uuid, err := NewUUID()
+	if err != nil {
+		return "", err
+	}
+
+	// Result: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+
+	var dst = make([]byte, 36)
+
+	hex.Encode(dst, uuid[:4])
+	dst[8] = '-'
+	hex.Encode(dst[9:13], uuid[4:6])
+	dst[13] = '-'
+	hex.Encode(dst[14:18], uuid[6:8])
+	dst[18] = '-'
+	hex.Encode(dst[19:23], uuid[8:10])
+	dst[23] = '-'
+	hex.Encode(dst[24:], uuid[10:])
+
+	return strings.ToUpper(string(dst)), nil
+}
+
+func NewRawHexUUID() (string, error) {
+	uuid, err := NewUUID()
+	if err != nil {
+		return "", err
+	}
+
+	// Result: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+
+	var dst = make([]byte, 32)
+
+	hex.Encode(dst, uuid[:4])
+	hex.Encode(dst[8:12], uuid[4:6])
+	hex.Encode(dst[12:16], uuid[6:8])
+	hex.Encode(dst[16:20], uuid[8:10])
+	hex.Encode(dst[20:], uuid[10:])
+
+	return strings.ToUpper(string(dst)), nil
+}
+
+func NewBracesUUID() (string, error) {
+	uuid, err := NewUUID()
+	if err != nil {
+		return "", err
+	}
+
+	// Result: {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}
+
+	var dst = make([]byte, 38)
+
+	dst[0] = '{'
+	hex.Encode(dst, uuid[:5])
+	dst[9] = '-'
+	hex.Encode(dst[10:14], uuid[4:6])
+	dst[14] = '-'
+	hex.Encode(dst[15:19], uuid[6:8])
+	dst[19] = '-'
+	hex.Encode(dst[20:24], uuid[8:10])
+	dst[24] = '-'
+	hex.Encode(dst[25:], uuid[10:])
+	dst[37] = '}'
+
+	return strings.ToUpper(string(dst)), nil
+}
+
+func NewParensUUID() (string, error) {
+	uuid, err := NewUUID()
+	if err != nil {
+		return "", err
+	}
+
+	// Result: (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
+
+	var dst = make([]byte, 38)
+
+	dst[0] = '('
+	hex.Encode(dst, uuid[:5])
+	dst[9] = '-'
+	hex.Encode(dst[10:14], uuid[4:6])
+	dst[14] = '-'
+	hex.Encode(dst[15:19], uuid[6:8])
+	dst[19] = '-'
+	hex.Encode(dst[20:24], uuid[8:10])
+	dst[24] = '-'
+	hex.Encode(dst[25:], uuid[10:])
+	dst[37] = ')'
+
+	return strings.ToUpper(string(dst)), nil
+}

mathext/math.go

@@ -1,5 +1,7 @@
 package mathext
 
+import "gogs.mikescher.com/BlackForestBytes/goext/langext"
+
 func AvgFloat64(arr []float64) float64 {
 	return SumFloat64(arr) / float64(len(arr))
 }
@@ -11,3 +13,37 @@ func SumFloat64(arr []float64) float64 {
 	}
 	return sum
 }
+
+func Max[T langext.OrderedConstraint](v1 T, v2 T) T {
+	if v1 > v2 {
+		return v1
+	} else {
+		return v2
+	}
+}
+
+func Min[T langext.OrderedConstraint](v1 T, v2 T) T {
+	if v1 < v2 {
+		return v1
+	} else {
+		return v2
+	}
+}
+
+func Abs[T langext.NumberConstraint](v T) T {
+	if v < 0 {
+		return -v
+	} else {
+		return v
+	}
+}
+
+func Clamp[T langext.NumberConstraint](v T, min T, max T) T {
+	if v < min {
+		return min
+	} else if v > max {
+		return max
+	} else {
+		return v
+	}
+}

mathext/statistics.go

@@ -1,26 +1,28 @@
 package mathext
 
-func Sum(v []float64) float64 {
-	total := float64(0)
+import "gogs.mikescher.com/BlackForestBytes/goext/langext"
+
+func Sum[T langext.NumberConstraint](v []T) T {
+	total := T(0)
 	for _, v := range v {
 		total += v
 	}
 	return total
 }
 
-func Mean(v []float64) float64 {
-	return Sum(v) / float64(len(v))
+func Mean[T langext.FloatConstraint](v []T) T {
+	return Sum(v) / T(len(v))
 }
 
-func Median(v []float64) float64 {
+func Median[T langext.FloatConstraint](v []T) T {
 	if len(v)%2 == 1 {
 		return v[len(v)/2]
 	} else {
-		return (v[len(v)/2-1] + v[len(v)/2]) / float64(2)
+		return (v[len(v)/2-1] + v[len(v)/2]) / T(2)
 	}
 }
 
-func Min(v []float64) float64 {
+func ArrMin[T langext.OrderedConstraint](v []T) T {
 	r := v[0]
 	for _, val := range v {
 		if val < r {
@@ -30,7 +32,7 @@ func Min(v []float64) float64 {
 	return r
 }
 
-func Max(v []float64) float64 {
+func ArrMax[T langext.OrderedConstraint](v []T) T {
 	r := v[0]
 	for _, val := range v {
 		if val > r {

sq/database.go

@@ -0,0 +1,89 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+	"sync"
+)
+
+type DB interface {
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+	Ping(ctx context.Context) error
+	BeginTransaction(ctx context.Context, iso sql.IsolationLevel) (Tx, error)
+	SetListener(listener Listener)
+}
+
+type database struct {
+	db    *sqlx.DB
+	txctr uint16
+	lock  sync.Mutex
+	lstr  Listener
+}
+
+func NewDB(db *sqlx.DB) DB {
+	return &database{
+		db:    db,
+		txctr: 0,
+		lock:  sync.Mutex{},
+	}
+}
+
+func (db *database) SetListener(listener Listener) {
+	db.lstr = listener
+}
+
+func (db *database) Exec(ctx context.Context, sql string, prep PP) (sql.Result, error) {
+	if db.lstr != nil {
+		db.lstr.OnExec(nil, sql, &prep)
+	}
+
+	res, err := db.db.NamedExecContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+func (db *database) Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error) {
+	if db.lstr != nil {
+		db.lstr.OnQuery(nil, sql, &prep)
+	}
+
+	rows, err := db.db.NamedQueryContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return rows, nil
+}
+
+func (db *database) Ping(ctx context.Context) error {
+	if db.lstr != nil {
+		db.lstr.OnPing()
+	}
+
+	err := db.db.PingContext(ctx)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (db *database) BeginTransaction(ctx context.Context, iso sql.IsolationLevel) (Tx, error) {
+	db.lock.Lock()
+	txid := db.txctr
+	db.txctr += 1 // with overflow !
+	db.lock.Unlock()
+
+	if db.lstr != nil {
+		db.lstr.OnTxBegin(txid)
+	}
+
+	xtx, err := db.db.BeginTxx(ctx, &sql.TxOptions{Isolation: iso})
+	if err != nil {
+		return nil, err
+	}
+
+	return NewTransaction(xtx, txid, db.lstr), nil
+}

sq/listener.go

@@ -0,0 +1,10 @@
+package sq
+
+type Listener interface {
+	OnQuery(txID *uint16, sql string, params *PP)
+	OnExec(txID *uint16, sql string, params *PP)
+	OnPing()
+	OnTxBegin(txid uint16)
+	OnTxCommit(txid uint16)
+	OnTxRollback(txid uint16)
+}

sq/params.go

@@ -0,0 +1,3 @@
+package sq
+
+type PP map[string]any

sq/queryable.go

@@ -0,0 +1,12 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+)
+
+type Queryable interface {
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+}

sq/scanner.go

@@ -0,0 +1,52 @@
+package sq
+
+import (
+	"database/sql"
+	"errors"
+	"github.com/jmoiron/sqlx"
+)
+
+func ScanSingle[TData any](rows *sqlx.Rows, close bool) (TData, error) {
+	if rows.Next() {
+		var data TData
+		err := rows.StructScan(&data)
+		if err != nil {
+			return *new(TData), err
+		}
+		if rows.Next() {
+			_ = rows.Close()
+			return *new(TData), errors.New("sql returned more than onw row")
+		}
+		if close {
+			err = rows.Close()
+			if err != nil {
+				return *new(TData), err
+			}
+		}
+		return data, nil
+	} else {
+		if close {
+			_ = rows.Close()
+		}
+		return *new(TData), sql.ErrNoRows
+	}
+}
+
+func ScanAll[TData any](rows *sqlx.Rows, close bool) ([]TData, error) {
+	res := make([]TData, 0)
+	for rows.Next() {
+		var data TData
+		err := rows.StructScan(&data)
+		if err != nil {
+			return nil, err
+		}
+		res = append(res, data)
+	}
+	if close {
+		err := rows.Close()
+		if err != nil {
+			return nil, err
+		}
+	}
+	return res, nil
+}

sq/transaction.go

@@ -0,0 +1,69 @@
+package sq
+
+import (
+	"context"
+	"database/sql"
+	"github.com/jmoiron/sqlx"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+)
+
+type Tx interface {
+	Rollback() error
+	Commit() error
+	Exec(ctx context.Context, sql string, prep PP) (sql.Result, error)
+	Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error)
+}
+
+type transaction struct {
+	tx   *sqlx.Tx
+	id   uint16
+	lstr Listener
+}
+
+func NewTransaction(xtx *sqlx.Tx, txid uint16, lstr Listener) Tx {
+	return &transaction{
+		tx:   xtx,
+		id:   txid,
+		lstr: lstr,
+	}
+}
+
+func (tx *transaction) Rollback() error {
+	if tx.lstr != nil {
+		tx.lstr.OnTxRollback(tx.id)
+	}
+
+	return tx.tx.Rollback()
+}
+
+func (tx *transaction) Commit() error {
+	if tx.lstr != nil {
+		tx.lstr.OnTxCommit(tx.id)
+	}
+
+	return tx.tx.Commit()
+}
+
+func (tx *transaction) Exec(ctx context.Context, sql string, prep PP) (sql.Result, error) {
+	if tx.lstr != nil {
+		tx.lstr.OnExec(langext.Ptr(tx.id), sql, &prep)
+	}
+
+	res, err := tx.tx.NamedExecContext(ctx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+func (tx *transaction) Query(ctx context.Context, sql string, prep PP) (*sqlx.Rows, error) {
+	if tx.lstr != nil {
+		tx.lstr.OnQuery(langext.Ptr(tx.id), sql, &prep)
+	}
+
+	rows, err := sqlx.NamedQueryContext(ctx, tx.tx, sql, prep)
+	if err != nil {
+		return nil, err
+	}
+	return rows, nil
+}

syncext/atomic.go

@@ -0,0 +1,104 @@
+package syncext
+
+import (
+	"context"
+	"sync/atomic"
+	"time"
+)
+
+type AtomicBool struct {
+	v      int32
+	waiter chan bool // unbuffered
+}
+
+func NewAtomicBool(value bool) *AtomicBool {
+	if value {
+		return &AtomicBool{v: 1, waiter: make(chan bool)}
+	} else {
+		return &AtomicBool{v: 0, waiter: make(chan bool)}
+	}
+}
+
+func (a *AtomicBool) Get() bool {
+	return atomic.LoadInt32(&a.v) == 1
+}
+
+func (a *AtomicBool) Set(value bool) {
+	if value {
+		atomic.StoreInt32(&a.v, 1)
+	} else {
+		atomic.StoreInt32(&a.v, 0)
+	}
+
+	select {
+	case a.waiter <- value:
+		// message sent
+	default:
+		// no receiver on channel
+	}
+}
+
+func (a *AtomicBool) Wait(waitFor bool) {
+	if a.Get() == waitFor {
+		return
+	}
+
+	for {
+		if v, ok := ReadChannelWithTimeout(a.waiter, 128*time.Millisecond); ok {
+			if v == waitFor {
+				return
+			}
+		} else {
+			if a.Get() == waitFor {
+				return
+			}
+		}
+	}
+}
+
+func (a *AtomicBool) WaitWithTimeout(timeout time.Duration, waitFor bool) error {
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	return a.WaitWithContext(ctx, waitFor)
+}
+
+func (a *AtomicBool) WaitWithContext(ctx context.Context, waitFor bool) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	if a.Get() == waitFor {
+		return nil
+	}
+
+	for {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+
+		timeOut := 128 * time.Millisecond
+
+		if dl, ok := ctx.Deadline(); ok {
+			timeOutMax := dl.Sub(time.Now())
+			if timeOutMax <= 0 {
+				timeOut = 0
+			} else if 0 < timeOutMax && timeOutMax < timeOut {
+				timeOut = timeOutMax
+			}
+		}
+
+		if v, ok := ReadChannelWithTimeout(a.waiter, timeOut); ok {
+			if v == waitFor {
+				return nil
+			}
+		} else {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+
+			if a.Get() == waitFor {
+				return nil
+			}
+		}
+	}
+}

syncext/channel.go

@@ -0,0 +1,45 @@
+package syncext
+
+import (
+	"time"
+)
+
+// https://gobyexample.com/non-blocking-channel-operations
+// https://gobyexample.com/timeouts
+// https://groups.google.com/g/golang-nuts/c/Oth9CmJPoqo
+
+func ReadChannelWithTimeout[T any](c chan T, timeout time.Duration) (T, bool) {
+	select {
+	case msg := <-c:
+		return msg, true
+	case <-time.After(timeout):
+		return *new(T), false
+	}
+}
+
+func WriteChannelWithTimeout[T any](c chan T, msg T, timeout time.Duration) bool {
+	select {
+	case c <- msg:
+		return true
+	case <-time.After(timeout):
+		return false
+	}
+}
+
+func ReadNonBlocking[T any](c chan T) (T, bool) {
+	select {
+	case msg := <-c:
+		return msg, true
+	default:
+		return *new(T), false
+	}
+}
+
+func WriteNonBlocking[T any](c chan T, msg T) bool {
+	select {
+	case c <- msg:
+		return true
+	default:
+		return false
+	}
+}

syncext/channel_test.go

@@ -0,0 +1,121 @@
+package syncext
+
+import (
+	"testing"
+	"time"
+)
+
+func TestTimeoutReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestTimeoutReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestTimeoutReadUnbuffered(t *testing.T) {
+	c := make(chan int)
+
+	go func() {
+		time.Sleep(200 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if ok {
+		t.Error("Read success, but should timeout")
+	}
+}
+
+func TestNoTimeoutAfterStartReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutAfterStartReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutAfterStartReadUnbuffered(t *testing.T) {
+	c := make(chan int)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		c <- 112
+	}()
+
+	_, ok := ReadChannelWithTimeout(c, 100*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+
+}
+
+func TestNoTimeoutBeforeStartReadBuffered(t *testing.T) {
+	c := make(chan int, 1)
+
+	c <- 112
+
+	_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}
+
+func TestNoTimeoutBeforeStartReadBigBuffered(t *testing.T) {
+	c := make(chan int, 128)
+
+	c <- 112
+
+	_, ok := ReadChannelWithTimeout(c, 10*time.Millisecond)
+
+	if !ok {
+		t.Error("Read timeout, but should have succeeded")
+	}
+}

termext/colors.go

@@ -0,0 +1,61 @@
+package termext
+
+import "strings"
+
+const (
+	colorReset  = "\033[0m"
+	colorRed    = "\033[31m"
+	colorGreen  = "\033[32m"
+	colorYellow = "\033[33m"
+	colorBlue   = "\033[34m"
+	colorPurple = "\033[35m"
+	colorCyan   = "\033[36m"
+	colorGray   = "\033[37m"
+	colorWhite  = "\033[97m"
+)
+
+func Red(v string) string {
+	return colorRed + v + colorReset
+}
+
+func Green(v string) string {
+	return colorGreen + v + colorReset
+}
+
+func Yellow(v string) string {
+	return colorYellow + v + colorReset
+}
+
+func Blue(v string) string {
+	return colorBlue + v + colorReset
+}
+
+func Purple(v string) string {
+	return colorPurple + v + colorReset
+}
+
+func Cyan(v string) string {
+	return colorCyan + v + colorReset
+}
+
+func Gray(v string) string {
+	return colorGray + v + colorReset
+}
+
+func White(v string) string {
+	return colorWhite + v + colorReset
+}
+
+func CleanString(v string) string {
+	v = strings.ReplaceAll(v, colorReset, "")
+	v = strings.ReplaceAll(v, colorRed, "")
+	v = strings.ReplaceAll(v, colorGreen, "")
+	v = strings.ReplaceAll(v, colorYellow, "")
+	v = strings.ReplaceAll(v, colorBlue, "")
+	v = strings.ReplaceAll(v, colorPurple, "")
+	v = strings.ReplaceAll(v, colorCyan, "")
+	v = strings.ReplaceAll(v, colorGray, "")
+	v = strings.ReplaceAll(v, colorWhite, "")
+
+	return v
+}

termext/osutil_darwin.go

@@ -0,0 +1,5 @@
+package termext
+
+func enableColor() bool {
+	return true
+}

termext/osutil_freebsd.go

@@ -0,0 +1,5 @@
+package termext
+
+func enableColor() bool {
+	return true
+}

termext/osutil_linux.go

@@ -0,0 +1,5 @@
+package termext
+
+func enableColor() bool {
+	return true
+}

termext/osutil_netbsd.go

@@ -0,0 +1,5 @@
+package termext
+
+func enableColor() bool {
+	return true
+}

termext/osutil_openbsd.go

@@ -0,0 +1,5 @@
+package termext
+
+func enableColor() bool {
+	return true
+}

termext/osutil_windows.go

@@ -0,0 +1,26 @@
+package termext
+
+import "golang.org/x/sys/windows"
+
+func enableColor() bool {
+	handle, err := windows.GetStdHandle(windows.STD_OUTPUT_HANDLE)
+	if err != nil {
+		return false
+	}
+
+	var mode uint32
+	err = windows.GetConsoleMode(handle, &mode)
+	if err != nil {
+		return false
+	}
+
+	if mode&windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING != windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING {
+		mode = mode | windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
+		err = windows.SetConsoleMode(handle, mode)
+		if err != nil {
+			return false
+		}
+	}
+
+	return true
+}

termext/termcolor.go

@@ -0,0 +1,90 @@
+package termext
+
+import (
+	"golang.org/x/term"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// -> partly copied from [ https://github.com/jwalton/go-supportscolor/tree/master ]
+
+func SupportsColors() bool {
+
+	if isatty := term.IsTerminal(int(os.Stdout.Fd())); !isatty {
+		return false
+	}
+
+	termenv := os.Getenv("TERM")
+
+	if termenv == "dumb" {
+		return false
+	}
+
+	if osColorEnabled := enableColor(); !osColorEnabled {
+		return false
+	}
+
+	if _, ci := os.LookupEnv("CI"); ci {
+		var ciEnvNames = []string{"TRAVIS", "CIRCLECI", "APPVEYOR", "GITLAB_CI", "GITHUB_ACTIONS", "BUILDKITE", "DRONE"}
+		for _, ciEnvName := range ciEnvNames {
+			_, exists := os.LookupEnv(ciEnvName)
+			if exists {
+				return true
+			}
+		}
+
+		if os.Getenv("CI_NAME") == "codeship" {
+			return true
+		}
+
+		return false
+	}
+
+	if teamCityVersion, isTeamCity := os.LookupEnv("TEAMCITY_VERSION"); isTeamCity {
+		versionRegex := regexp.MustCompile(`^(9\.(0*[1-9]\d*)\.|\d{2,}\.)`)
+		if versionRegex.MatchString(teamCityVersion) {
+			return true
+		}
+		return false
+	}
+
+	if os.Getenv("COLORTERM") == "truecolor" {
+		return true
+	}
+
+	if termProgram, termProgramPreset := os.LookupEnv("TERM_PROGRAM"); termProgramPreset {
+		switch termProgram {
+		case "iTerm.app":
+			termProgramVersion := strings.Split(os.Getenv("TERM_PROGRAM_VERSION"), ".")
+			version, err := strconv.ParseInt(termProgramVersion[0], 10, 64)
+			if err == nil && version >= 3 {
+				return true
+			}
+			return true
+		case "Apple_Terminal":
+			return true
+
+		default:
+			// No default
+		}
+	}
+
+	var term256Regex = regexp.MustCompile("(?i)-256(color)?$")
+	if term256Regex.MatchString(termenv) {
+		return true
+	}
+
+	var termBasicRegex = regexp.MustCompile("(?i)^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux")
+
+	if termBasicRegex.MatchString(termenv) {
+		return true
+	}
+
+	if _, colorTerm := os.LookupEnv("COLORTERM"); colorTerm {
+		return true
+	}
+
+	return false
+}

termext/termcolor_test.go

@@ -0,0 +1,40 @@
+package termext
+
+import (
+	"math/rand"
+	"testing"
+)
+
+func init() {
+	rand.Seed(0)
+}
+
+func TestSupportsColors(t *testing.T) {
+	SupportsColors() // should not error
+}
+
+func TestColor(t *testing.T) {
+	assertEqual(t, Red("test"), "\033[31mtest\u001B[0m")
+	assertEqual(t, Green("test"), "\033[32mtest\u001B[0m")
+	assertEqual(t, Yellow("test"), "\033[33mtest\u001B[0m")
+	assertEqual(t, Blue("test"), "\033[34mtest\u001B[0m")
+	assertEqual(t, Purple("test"), "\033[35mtest\u001B[0m")
+	assertEqual(t, Cyan("test"), "\033[36mtest\u001B[0m")
+	assertEqual(t, Gray("test"), "\033[37mtest\u001B[0m")
+	assertEqual(t, White("test"), "\033[97mtest\u001B[0m")
+
+	assertEqual(t, CleanString(Red("test")), "test")
+	assertEqual(t, CleanString(Green("test")), "test")
+	assertEqual(t, CleanString(Yellow("test")), "test")
+	assertEqual(t, CleanString(Blue("test")), "test")
+	assertEqual(t, CleanString(Purple("test")), "test")
+	assertEqual(t, CleanString(Cyan("test")), "test")
+	assertEqual(t, CleanString(Gray("test")), "test")
+	assertEqual(t, CleanString(White("test")), "test")
+}
+
+func assertEqual(t *testing.T, actual string, expected string) {
+	if actual != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual, expected)
+	}
+}

timeext/duration.go

@@ -1,55 +1,68 @@
 package timeext
 
-import "time"
+import (
+	"fmt"
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"time"
+)
 
-func FromSeconds(v int) time.Duration {
-	return time.Duration(int64(v) * int64(time.Second))
+func FromNanoseconds[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Nanosecond)))
 }
 
-func FromSecondsInt32(v int32) time.Duration {
-	return time.Duration(int64(v) * int64(time.Second))
+func FromMicroseconds[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Microsecond)))
 }
 
-func FromSecondsInt64(v int64) time.Duration {
-	return time.Duration(v * int64(time.Second))
+func FromMilliseconds[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Millisecond)))
 }
 
-func FromSecondsFloat32(v float32) time.Duration {
-	return time.Duration(int64(v * float32(time.Second)))
+func FromSeconds[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Second)))
 }
 
-func FromSecondsFloat64(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Second)))
+func FromMinutes[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Minute)))
 }
 
-func FromSecondsFloat(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Second)))
+func FromHours[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(time.Hour)))
 }
 
-func FromMinutes(v int) time.Duration {
-	return time.Duration(int64(v) * int64(time.Minute))
+func FromDays[T langext.NumberConstraint](v T) time.Duration {
+	return time.Duration(int64(float64(v) * float64(24) * float64(time.Hour)))
 }
 
-func FromMinutesFloat(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Minute)))
+func FormatNaturalDurationEnglish(iv time.Duration) string {
+	if sec := int64(iv.Seconds()); sec < 180 {
+		if sec == 1 {
+			return "1 second ago"
+		} else {
+			return fmt.Sprintf("%d seconds ago", sec)
+		}
 	}
 
-func FromMinutesFloat64(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Minute)))
+	if min := int64(iv.Minutes()); min < 180 {
+		return fmt.Sprintf("%d minutes ago", min)
 	}
 
-func FromHoursFloat64(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Hour)))
+	if hours := int64(iv.Hours()); hours < 72 {
+		return fmt.Sprintf("%d hours ago", hours)
 	}
 
-func FromDays(v int) time.Duration {
-	return time.Duration(int64(v) * int64(24) * int64(time.Hour))
+	if days := int64(iv.Hours() / 24.0); days < 21 {
+		return fmt.Sprintf("%d days ago", days)
 	}
 
-func FromMilliseconds(v int) time.Duration {
-	return time.Duration(int64(v) * int64(time.Millisecond))
+	if weeks := int64(iv.Hours() / 24.0 / 7.0); weeks < 12 {
+		return fmt.Sprintf("%d weeks ago", weeks)
 	}
 
-func FromMillisecondsFloat(v float64) time.Duration {
-	return time.Duration(int64(v * float64(time.Millisecond)))
+	if months := int64(iv.Hours() / 24.0 / 7.0 / 30); months < 36 {
+		return fmt.Sprintf("%d months ago", months)
+	}
+
+	years := int64(iv.Hours() / 24.0 / 7.0 / 365)
+	return fmt.Sprintf("%d years ago", years)
 }

timeext/parser.go

@@ -0,0 +1,152 @@
+package timeext
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var durationShortStringMap = map[string]time.Duration{
+	"ns":          time.Nanosecond,
+	"nanosecond":  time.Nanosecond,
+	"nanoseconds": time.Nanosecond,
+
+	"us":           time.Microsecond,
+	"microsecond":  time.Microsecond,
+	"microseconds": time.Microsecond,
+
+	"ms":           time.Millisecond,
+	"millisecond":  time.Millisecond,
+	"milliseconds": time.Millisecond,
+
+	"s":       time.Second,
+	"sec":     time.Second,
+	"second":  time.Second,
+	"seconds": time.Second,
+
+	"m":       time.Minute,
+	"min":     time.Minute,
+	"minute":  time.Minute,
+	"minutes": time.Minute,
+
+	"h":     time.Hour,
+	"hour":  time.Hour,
+	"hours": time.Hour,
+
+	"d":    24 * time.Hour,
+	"day":  24 * time.Hour,
+	"days": 24 * time.Hour,
+
+	"w":     7 * 24 * time.Hour,
+	"wk":    7 * 24 * time.Hour,
+	"week":  7 * 24 * time.Hour,
+	"weeks": 7 * 24 * time.Hour,
+}
+
+// ParseDurationShortString parses a duration in string format to a time.Duration
+// Examples for allowed formats:
+//   - '10m'
+//   - '10min'
+//   - '1minute'
+//   - '10minutes'
+//   - '10.5minutes'
+//   - '50s'
+//   - '50sec'
+//   - '1second'
+//   - '50seconds'
+//   - '100ms'
+//   - '100millisseconds'
+//   - '1h'
+//   - '1hour'
+//   - '2hours'
+//   - '1d'
+//   - '1day'
+//   - '10days'
+//   - '1d10m'
+//   - '1d10m200sec'
+//   - '1d:10m'
+//   - '1d 10m'
+//   - '1d,10m'
+func ParseDurationShortString(s string) (time.Duration, error) {
+	s = strings.ToLower(s)
+
+	segments := make([]string, 0)
+	collector := ""
+
+	prevWasNum := true
+	for _, chr := range s {
+		if chr >= '0' && chr <= '9' || chr == '.' {
+			if prevWasNum {
+				collector += string(chr)
+			} else {
+				segments = append(segments, collector)
+				prevWasNum = true
+				collector = string(chr)
+			}
+		} else if chr == ' ' || chr == ':' || chr == ',' {
+			continue
+		} else if chr >= 'a' && chr <= 'z' {
+			prevWasNum = false
+			collector += string(chr)
+		} else {
+			return 0, errors.New("unexpected character: " + string(chr))
+		}
+	}
+	if !prevWasNum {
+		segments = append(segments, collector)
+	}
+
+	result := time.Duration(0)
+	for _, seg := range segments {
+		segDur, err := parseDurationShortStringSegment(seg)
+		if err != nil {
+			return 0, err
+		}
+		result += segDur
+	}
+	return result, nil
+}
+
+func parseDurationShortStringSegment(segment string) (time.Duration, error) {
+	num := ""
+	unit := ""
+
+	part0 := true
+	for _, chr := range segment {
+		if part0 {
+
+			if chr >= 'a' && chr <= 'z' {
+				part0 = false
+				unit += string(chr)
+			} else if chr >= '0' && chr <= '9' || chr == '.' {
+				num += string(chr)
+			} else {
+				return 0, errors.New(fmt.Sprintf("Unexpected character '%s' in segment [%s]", string(chr), segment))
+			}
+
+		} else {
+
+			if chr >= 'a' && chr <= 'z' {
+				unit += string(chr)
+			} else if chr >= '0' && chr <= '9' || chr == '.' {
+				return 0, errors.New(fmt.Sprintf("Unexpected number '%s' in segment [%s]", string(chr), segment))
+			} else {
+				return 0, errors.New(fmt.Sprintf("Unexpected character '%s' in segment [%s]", string(chr), segment))
+			}
+
+		}
+	}
+
+	fpnum, err := strconv.ParseFloat(num, 64)
+	if err != nil {
+		return 0, errors.New(fmt.Sprintf("Failed to parse floating-point number '%s' in segment [%s]", num, segment))
+	}
+
+	if mult, ok := durationShortStringMap[unit]; ok {
+		return time.Duration(int64(fpnum * float64(mult))), nil
+	} else {
+		return 0, errors.New(fmt.Sprintf("Unknown unit '%s' in segment [%s]", unit, segment))
+	}
+}

timeext/parser_test.go

@@ -0,0 +1,70 @@
+package timeext
+
+import (
+	"testing"
+	"time"
+)
+
+func TestParseDurationShortString(t *testing.T) {
+
+	assertPDSSEqual(t, FromSeconds(1), "1s")
+	assertPDSSEqual(t, FromSeconds(1), "1sec")
+	assertPDSSEqual(t, FromSeconds(1), "1second")
+	assertPDSSEqual(t, FromSeconds(1), "1seconds")
+	assertPDSSEqual(t, FromSeconds(100), "100second")
+	assertPDSSEqual(t, FromSeconds(100), "100seconds")
+	assertPDSSEqual(t, FromSeconds(1883639.77), "1883639.77second")
+	assertPDSSEqual(t, FromSeconds(1883639.77), "1883639.77seconds")
+	assertPDSSEqual(t, FromSeconds(50), "50s")
+	assertPDSSEqual(t, FromSeconds(50), "50sec")
+	assertPDSSEqual(t, FromSeconds(1), "1second")
+	assertPDSSEqual(t, FromSeconds(50), "50seconds")
+
+	assertPDSSEqual(t, FromMinutes(10), "10m")
+	assertPDSSEqual(t, FromMinutes(10), "10min")
+	assertPDSSEqual(t, FromMinutes(1), "1minute")
+	assertPDSSEqual(t, FromMinutes(10), "10minutes")
+	assertPDSSEqual(t, FromMinutes(10.5), "10.5minutes")
+
+	assertPDSSEqual(t, FromMilliseconds(100), "100ms")
+	assertPDSSEqual(t, FromMilliseconds(100), "100milliseconds")
+	assertPDSSEqual(t, FromMilliseconds(100), "100millisecond")
+
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235ns")
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235nanoseconds")
+	assertPDSSEqual(t, FromNanoseconds(99235), "99235nanosecond")
+
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235us")
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235microseconds")
+	assertPDSSEqual(t, FromMicroseconds(99235), "99235microsecond")
+
+	assertPDSSEqual(t, FromHours(1), "1h")
+	assertPDSSEqual(t, FromHours(1), "1hour")
+	assertPDSSEqual(t, FromHours(2), "2hours")
+
+	assertPDSSEqual(t, FromDays(1), "1d")
+	assertPDSSEqual(t, FromDays(1), "1day")
+	assertPDSSEqual(t, FromDays(10), "10days")
+	assertPDSSEqual(t, FromDays(1), "1days")
+	assertPDSSEqual(t, FromDays(10), "10day")
+
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10)+FromSeconds(200), "1d10m200sec")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d:10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d 10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d,10m")
+	assertPDSSEqual(t, FromDays(1)+FromMinutes(10), "1d, 10m")
+	assertPDSSEqual(t, FromDays(1)+FromSeconds(1000), "1d   1000seconds")
+
+	assertPDSSEqual(t, FromDays(1), "86400s")
+}
+
+func assertPDSSEqual(t *testing.T, expected time.Duration, fmt string) {
+	actual, err := ParseDurationShortString(fmt)
+	if err != nil {
+		t.Errorf("ParseDurationShortString('%s') failed with %v", fmt, err)
+	}
+	if actual != expected {
+		t.Errorf("values differ: Actual: '%v', Expected: '%v'", actual.String(), expected.String())
+	}
+}

timeext/time.go

@@ -17,14 +17,14 @@ func init() {
 }
 
 // TimeToDatePart returns a timestamp at the start of the day which contains t (= 00:00:00)
-func TimeToDatePart(t time.Time) time.Time {
-	t = t.In(TimezoneBerlin)
+func TimeToDatePart(t time.Time, tz *time.Location) time.Time {
+	t = t.In(tz)
 	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
 }
 
 // TimeToWeekStart returns a timestamp at the start of the week which contains t (= Monday 00:00:00)
-func TimeToWeekStart(t time.Time) time.Time {
-	t = TimeToDatePart(t)
+func TimeToWeekStart(t time.Time, tz *time.Location) time.Time {
+	t = TimeToDatePart(t, tz)
 
 	delta := time.Duration(((int64(t.Weekday()) + 6) % 7) * 24 * int64(time.Hour))
 	t = t.Add(-1 * delta)
@@ -33,32 +33,32 @@ func TimeToWeekStart(t time.Time) time.Time {
 }
 
 // TimeToMonthStart returns a timestamp at the start of the month which contains t (= yyyy-MM-00 00:00:00)
-func TimeToMonthStart(t time.Time) time.Time {
-	t = t.In(TimezoneBerlin)
+func TimeToMonthStart(t time.Time, tz *time.Location) time.Time {
+	t = t.In(tz)
 	return time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
 }
 
 // TimeToMonthEnd returns a timestamp at the end of the month which contains t (= yyyy-MM-31 23:59:59.999999999)
-func TimeToMonthEnd(t time.Time) time.Time {
-	return TimeToMonthStart(t).AddDate(0, 1, 0).Add(-1)
+func TimeToMonthEnd(t time.Time, tz *time.Location) time.Time {
+	return TimeToMonthStart(t, tz).AddDate(0, 1, 0).Add(-1)
 }
 
 // TimeToYearStart returns a timestamp at the start of the year which contains t (= yyyy-01-01 00:00:00)
-func TimeToYearStart(t time.Time) time.Time {
-	t = t.In(TimezoneBerlin)
+func TimeToYearStart(t time.Time, tz *time.Location) time.Time {
+	t = t.In(tz)
 	return time.Date(t.Year(), 1, 1, 0, 0, 0, 0, t.Location())
 }
 
 // TimeToYearEnd returns a timestamp at the end of the month which contains t (= yyyy-12-31 23:59:59.999999999)
-func TimeToYearEnd(t time.Time) time.Time {
-	return TimeToYearStart(t).AddDate(1, 0, 0).Add(-1)
+func TimeToYearEnd(t time.Time, tz *time.Location) time.Time {
+	return TimeToYearStart(t, tz).AddDate(1, 0, 0).Add(-1)
 }
 
 // IsSameDayIncludingDateBoundaries returns true if t1 and t2 are part of the same day (TZ/Berlin), the boundaries of the day are
 // inclusive, this means 2021-09-15T00:00:00 is still part of the day 2021-09-14
-func IsSameDayIncludingDateBoundaries(t1 time.Time, t2 time.Time) bool {
-	dp1 := TimeToDatePart(t1)
-	dp2 := TimeToDatePart(t2)
+func IsSameDayIncludingDateBoundaries(t1 time.Time, t2 time.Time, tz *time.Location) bool {
+	dp1 := TimeToDatePart(t1, tz)
+	dp2 := TimeToDatePart(t2, tz)
 
 	if dp1.Equal(dp2) {
 		return true
@@ -72,9 +72,9 @@ func IsSameDayIncludingDateBoundaries(t1 time.Time, t2 time.Time) bool {
 }
 
 // IsDatePartEqual returns true if a and b have the same date part (`yyyy`, `MM` and `dd`)
-func IsDatePartEqual(a time.Time, b time.Time) bool {
-	yy1, mm1, dd1 := a.In(TimezoneBerlin).Date()
-	yy2, mm2, dd2 := b.In(TimezoneBerlin).Date()
+func IsDatePartEqual(a time.Time, b time.Time, tz *time.Location) bool {
+	yy1, mm1, dd1 := a.In(tz).Date()
+	yy2, mm2, dd2 := b.In(tz).Date()
 
 	return yy1 == yy2 && mm1 == mm2 && dd1 == dd2
 }
@@ -82,9 +82,9 @@ func IsDatePartEqual(a time.Time, b time.Time) bool {
 // WithTimePart returns a timestamp with the date-part (`yyyy`, `MM`, `dd`) from base
 // and the time (`HH`, `mm`, `ss`) from the parameter
 func WithTimePart(base time.Time, hour, minute, second int) time.Time {
-	datepart := TimeToDatePart(base)
+	datepart := TimeToDatePart(base, base.Location())
 
-	delta := time.Duration(hour*int(time.Hour) + minute*int(time.Minute) + second*int(time.Second))
+	delta := time.Duration(int64(hour)*int64(time.Hour) + int64(minute)*int64(time.Minute) + int64(second)*int64(time.Second))
 
 	return datepart.Add(delta)
 }
@@ -92,23 +92,23 @@ func WithTimePart(base time.Time, hour, minute, second int) time.Time {
 // CombineDateAndTime returns a timestamp with the date-part (`yyyy`, `MM`, `dd`) from the d parameter
 // and the time (`HH`, `mm`, `ss`) from the t parameter
 func CombineDateAndTime(d time.Time, t time.Time) time.Time {
-	datepart := TimeToDatePart(d)
+	datepart := TimeToDatePart(d, d.Location())
 
-	delta := time.Duration(t.Hour()*int(time.Hour) + t.Minute()*int(time.Minute) + t.Second()*int(time.Second) + t.Nanosecond()*int(time.Nanosecond))
+	delta := time.Duration(int64(t.Hour())*int64(time.Hour) + int64(t.Minute())*int64(time.Minute) + int64(t.Second())*int64(time.Second) + int64(t.Nanosecond())*int64(time.Nanosecond))
 
 	return datepart.Add(delta)
 }
 
 // IsSunday returns true if t is a sunday (in TZ/Berlin)
-func IsSunday(t time.Time) bool {
-	if t.In(TimezoneBerlin).Weekday() == time.Sunday {
+func IsSunday(t time.Time, tz *time.Location) bool {
+	if t.In(tz).Weekday() == time.Sunday {
 		return true
 	}
 	return false
 }
 
 func DurationFromTime(hours int, minutes int, seconds int) time.Duration {
-	return time.Duration(hours*int(time.Hour) + minutes*int(time.Minute) + seconds*int(time.Second))
+	return time.Duration(int64(hours)*int64(time.Hour) + int64(minutes)*int64(time.Minute) + int64(seconds)*int64(time.Second))
 }
 
 func Min(a time.Time, b time.Time) time.Time {
@@ -131,3 +131,7 @@ func UnixFloatSeconds(v float64) time.Time {
 	sec, dec := math.Modf(v)
 	return time.Unix(int64(sec), int64(dec*(1e9)))
 }
+
+func FloorTime(t time.Time) time.Time {
+	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
+}