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package utils
import (
"fmt"
"strings"
"github.com/mattn/go-runewidth"
"github.com/samber/lo"
"golang.org/x/exp/slices"
)
type Alignment int
const (
AlignLeft Alignment = iota
AlignRight
)
type ColumnConfig struct {
Width int
Alignment Alignment
}
// WithPadding pads a string as much as you want
func WithPadding(str string, padding int, alignment Alignment) string {
uncoloredStr := Decolorise(str)
width := runewidth.StringWidth(uncoloredStr)
if padding < width {
return str
}
space := strings.Repeat(" ", padding-width)
if alignment == AlignLeft {
return str + space
} else {
return space + str
}
}
// defaults to left-aligning each column. If you want to set the alignment of
// each column, pass in a slice of Alignment values.
// returns a list of strings that should be joined with "\n", and an array of
// the column positions
func RenderDisplayStrings(displayStringsArr [][]string, columnAlignments []Alignment) ([]string, []int) {
displayStringsArr, columnAlignments, removedColumns := excludeBlankColumns(displayStringsArr, columnAlignments)
padWidths := getPadWidths(displayStringsArr)
columnConfigs := make([]ColumnConfig, len(padWidths))
columnPositions := make([]int, len(padWidths)+1)
columnPositions[0] = 0
for i, padWidth := range padWidths {
// gracefully handle when columnAlignments is shorter than padWidths
alignment := AlignLeft
if len(columnAlignments) > i {
alignment = columnAlignments[i]
}
columnConfigs[i] = ColumnConfig{
Width: padWidth,
Alignment: alignment,
}
columnPositions[i+1] = columnPositions[i] + padWidth + 1
}
// Add the removed columns back into columnPositions (a removed column gets
// the same position as the following column); clients should be able to rely
// on them all to be there
for _, removedColumn := range removedColumns {
if removedColumn < len(columnPositions) {
columnPositions = slices.Insert(columnPositions, removedColumn, columnPositions[removedColumn])
}
}
return getPaddedDisplayStrings(displayStringsArr, columnConfigs), columnPositions
}
// NOTE: this mutates the input slice for the sake of performance
func excludeBlankColumns(displayStringsArr [][]string, columnAlignments []Alignment) ([][]string, []Alignment, []int) {
if len(displayStringsArr) == 0 {
return displayStringsArr, columnAlignments, []int{}
}
// if all rows share a blank column, we want to remove that column
toRemove := []int{}
outer:
for i := range displayStringsArr[0] {
for _, strings := range displayStringsArr {
if strings[i] != "" {
continue outer
}
}
toRemove = append(toRemove, i)
}
if len(toRemove) == 0 {
return displayStringsArr, columnAlignments, []int{}
}
// remove the columns
for i, strings := range displayStringsArr {
for j := len(toRemove) - 1; j >= 0; j-- {
strings = slices.Delete(strings, toRemove[j], toRemove[j]+1)
}
displayStringsArr[i] = strings
}
for j := len(toRemove) - 1; j >= 0; j-- {
if columnAlignments != nil && toRemove[j] < len(columnAlignments) {
columnAlignments = slices.Delete(columnAlignments, toRemove[j], toRemove[j]+1)
}
}
return displayStringsArr, columnAlignments, toRemove
}
func getPaddedDisplayStrings(stringArrays [][]string, columnConfigs []ColumnConfig) []string {
result := make([]string, 0, len(stringArrays))
for _, stringArray := range stringArrays {
if len(stringArray) == 0 {
continue
}
builder := strings.Builder{}
for j, columnConfig := range columnConfigs {
if len(stringArray)-1 < j {
continue
}
builder.WriteString(WithPadding(stringArray[j], columnConfig.Width, columnConfig.Alignment))
builder.WriteString(" ")
}
if len(stringArray)-1 < len(columnConfigs) {
continue
}
builder.WriteString(stringArray[len(columnConfigs)])
result = append(result, builder.String())
}
return result
}
func getPadWidths(stringArrays [][]string) []int {
maxWidth := MaxFn(stringArrays, func(stringArray []string) int {
return len(stringArray)
})
if maxWidth-1 < 0 {
return []int{}
}
return lo.Map(lo.Range(maxWidth-1), func(i int, _ int) int {
return MaxFn(stringArrays, func(stringArray []string) int {
uncoloredStr := Decolorise(stringArray[i])
return runewidth.StringWidth(uncoloredStr)
})
})
}
func MaxFn[T any](items []T, fn func(T) int) int {
max := 0
for _, item := range items {
if fn(item) > max {
max = fn(item)
}
}
return max
}
// TruncateWithEllipsis returns a string, truncated to a certain length, with an ellipsis
func TruncateWithEllipsis(str string, limit int) string {
if runewidth.StringWidth(str) > limit && limit <= 3 {
return strings.Repeat(".", limit)
}
return runewidth.Truncate(str, limit, "...")
}
func SafeTruncate(str string, limit int) string {
if len(str) > limit {
return str[0:limit]
} else {
return str
}
}
const COMMIT_HASH_SHORT_SIZE = 8
func ShortSha(sha string) string {
if len(sha) < COMMIT_HASH_SHORT_SIZE {
return sha
}
return sha[:COMMIT_HASH_SHORT_SIZE]
}
// Returns comma-separated list of paths, with ellipsis if there are more than 3
// e.g. "foo, bar, baz, [...3 more]"
func FormatPaths(paths []string) string {
if len(paths) <= 3 {
return strings.Join(paths, ", ")
}
return fmt.Sprintf("%s, %s, %s, [...%d more]", paths[0], paths[1], paths[2], len(paths)-3)
}
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