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Diffstat (limited to 'vendor/github.com')
13 files changed, 769 insertions, 0 deletions
diff --git a/vendor/github.com/MichaelMure/go-term-text/.gitignore b/vendor/github.com/MichaelMure/go-term-text/.gitignore new file mode 100644 index 00000000..9f11b755 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/.gitignore @@ -0,0 +1 @@ +.idea/ diff --git a/vendor/github.com/MichaelMure/go-term-text/.travis.yml b/vendor/github.com/MichaelMure/go-term-text/.travis.yml new file mode 100644 index 00000000..496ca056 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/.travis.yml @@ -0,0 +1,16 @@ +language: go + +go: + - 1.10.x + - 1.11.x + - 1.12.x + +env: + - GO111MODULE=on + +script: + - go build + - go test -v -bench=. -race -coverprofile=coverage.txt -covermode=atomic ./... + +after_success: + - bash <(curl -s https://codecov.io/bash) diff --git a/vendor/github.com/MichaelMure/go-term-text/LICENSE b/vendor/github.com/MichaelMure/go-term-text/LICENSE new file mode 100644 index 00000000..5ba12bf4 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2019 Michael Muré + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/vendor/github.com/MichaelMure/go-term-text/Readme.md b/vendor/github.com/MichaelMure/go-term-text/Readme.md new file mode 100644 index 00000000..457b4472 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/Readme.md @@ -0,0 +1,71 @@ +# go-term-text + +[](https://travis-ci.org/MichaelMure/go-term-text) +[](https://godoc.org/github.com/MichaelMure/go-term-text) +[](https://goreportcard.com/report/github.com/MichaelMure/go-term-text) +[](https://codecov.io/gh/MichaelMure/go-term-text) +[](https://github.com/MichaelMure/go-term-text/blob/master/LICENSE) +[](https://gitter.im/the-git-bug/Lobby) + +`go-term-text` is a go package implementing a collection of algorithms to help format and manipulate text for the terminal. + +In particular, `go-term-text`: +- support wide characters (chinese, japanese ...) and emoji +- handle properly ANSI escape sequences + +Included algorithms cover: +- wrapping with padding and indentation +- padding +- text length +- trimming +- alignment +- escape sequence extraction and reapplication +- truncation + +## Example + +```go +package main + +import ( + "fmt" + "strings" + + text "github.com/MichaelMure/go-term-text" +) + +func main() { + input := "The \x1b[1mLorem ipsum\x1b[0m text is typically composed of " + + "pseudo-Latin words. It is commonly used as \x1b[3mplaceholder\x1b[0m" + + " text to examine or demonstrate the \x1b[9mvisual effects\x1b[0m of " + + "various graphic design. 一只 A Quick \x1b[31m敏捷的狐 Fox " + + "狸跳过了\x1b[0mDog一只懒狗。" + + output, n := text.WrapWithPadIndent(input, 60, + "\x1b[34m<-indent-> \x1b[0m", "\x1b[33m<-pad-> \x1b[0m") + + fmt.Printf("output has %d lines\n\n", n) + + fmt.Println("|" + strings.Repeat("-", 58) + "|") + fmt.Println(output) + fmt.Println("|" + strings.Repeat("-", 58) + "|") +} +``` + +This will print: + + + +For more details, have a look at the [GoDoc](https://godoc.org/github.com/MichaelMure/go-term-text). + +## Origin + +This package has been extracted from the [git-bug](https://github.com/MichaelMure/git-bug) project. As such, its aim is to support this project and not to provide an all-in-one solution. Contributions as welcome though. + +## Contribute + +PRs accepted. + +## License + +MIT diff --git a/vendor/github.com/MichaelMure/go-term-text/align.go b/vendor/github.com/MichaelMure/go-term-text/align.go new file mode 100644 index 00000000..8262a4de --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/align.go @@ -0,0 +1,67 @@ +package text + +import ( + "strings" +) + +type Alignment int + +const ( + NoAlign Alignment = iota + AlignLeft + AlignCenter + AlignRight +) + +// LineAlign align the given line as asked and apply the needed padding to match the given +// lineWidth, while ignoring the terminal escape sequences. +// If the given lineWidth is too small to fit the given line, it's returned without +// padding, overflowing lineWidth. +func LineAlign(line string, lineWidth int, align Alignment) string { + switch align { + case NoAlign: + return line + case AlignLeft: + return LineAlignLeft(line, lineWidth) + case AlignCenter: + return LineAlignCenter(line, lineWidth) + case AlignRight: + return LineAlignRight(line, lineWidth) + } + panic("unknown alignment") +} + +// LineAlignLeft align the given line on the left while ignoring the terminal escape sequences. +// If the given lineWidth is too small to fit the given line, it's returned without +// padding, overflowing lineWidth. +func LineAlignLeft(line string, lineWidth int) string { + return TrimSpace(line) +} + +// LineAlignCenter align the given line on the center and apply the needed left +// padding, while ignoring the terminal escape sequences. +// If the given lineWidth is too small to fit the given line, it's returned without +// padding, overflowing lineWidth. +func LineAlignCenter(line string, lineWidth int) string { + trimmed := TrimSpace(line) + totalPadLen := lineWidth - Len(trimmed) + if totalPadLen < 0 { + totalPadLen = 0 + } + pad := strings.Repeat(" ", totalPadLen/2) + return pad + trimmed +} + +// LineAlignRight align the given line on the right and apply the needed left +// padding to match the given lineWidth, while ignoring the terminal escape sequences. +// If the given lineWidth is too small to fit the given line, it's returned without +// padding, overflowing lineWidth. +func LineAlignRight(line string, lineWidth int) string { + trimmed := TrimSpace(line) + padLen := lineWidth - Len(trimmed) + if padLen < 0 { + padLen = 0 + } + pad := strings.Repeat(" ", padLen) + return pad + trimmed +} diff --git a/vendor/github.com/MichaelMure/go-term-text/escapes.go b/vendor/github.com/MichaelMure/go-term-text/escapes.go new file mode 100644 index 00000000..19f78c92 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/escapes.go @@ -0,0 +1,95 @@ +package text + +import ( + "strings" + "unicode/utf8" +) + +// EscapeItem hold the description of terminal escapes in a line. +// 'item' is the actual escape command +// 'pos' is the index in the rune array where the 'item' shall be inserted back. +// For example, the escape item in "F\x1b33mox" is {"\x1b33m", 1}. +type EscapeItem struct { + Item string + Pos int +} + +// ExtractTermEscapes extract terminal escapes out of a line and returns a new +// line without terminal escapes and a slice of escape items. The terminal escapes +// can be inserted back into the new line at rune index 'item.pos' to recover the +// original line. +// +// Required: The line shall not contain "\n" +func ExtractTermEscapes(line string) (string, []EscapeItem) { + var termEscapes []EscapeItem + var line1 strings.Builder + + pos := 0 + item := "" + occupiedRuneCount := 0 + inEscape := false + for i, r := range []rune(line) { + if r == '\x1b' { + pos = i + item = string(r) + inEscape = true + continue + } + if inEscape { + item += string(r) + if r == 'm' { + termEscapes = append(termEscapes, EscapeItem{item, pos - occupiedRuneCount}) + occupiedRuneCount += utf8.RuneCountInString(item) + inEscape = false + } + continue + } + line1.WriteRune(r) + } + + return line1.String(), termEscapes +} + +// ApplyTermEscapes apply the extracted terminal escapes to the edited line. +// Escape sequences need to be ordered by their position. +// If the position is < 0, the escape is applied at the beginning of the line. +// If the position is > len(line), the escape is applied at the end of the line. +func ApplyTermEscapes(line string, escapes []EscapeItem) string { + if len(escapes) == 0 { + return line + } + + var out strings.Builder + + currPos := 0 + currItem := 0 + for _, r := range line { + for currItem < len(escapes) && currPos >= escapes[currItem].Pos { + out.WriteString(escapes[currItem].Item) + currItem++ + } + out.WriteRune(r) + currPos++ + } + + // Don't forget the trailing escapes, if any. + for currItem < len(escapes) { + out.WriteString(escapes[currItem].Item) + currItem++ + } + + return out.String() +} + +// OffsetEscapes is a utility function to offset the position of a +// collection of EscapeItem. +func OffsetEscapes(escapes []EscapeItem, offset int) []EscapeItem { + result := make([]EscapeItem, len(escapes)) + for i, e := range escapes { + result[i] = EscapeItem{ + Item: e.Item, + Pos: e.Pos + offset, + } + } + return result +} diff --git a/vendor/github.com/MichaelMure/go-term-text/go.mod b/vendor/github.com/MichaelMure/go-term-text/go.mod new file mode 100644 index 00000000..162c5dac --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/go.mod @@ -0,0 +1,8 @@ +module github.com/MichaelMure/go-term-text + +go 1.10 + +require ( + github.com/mattn/go-runewidth v0.0.4 + github.com/stretchr/testify v1.3.0 +) diff --git a/vendor/github.com/MichaelMure/go-term-text/go.sum b/vendor/github.com/MichaelMure/go-term-text/go.sum new file mode 100644 index 00000000..0aaedf16 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/go.sum @@ -0,0 +1,9 @@ +github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y= +github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= +github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q= +github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= diff --git a/vendor/github.com/MichaelMure/go-term-text/left_pad.go b/vendor/github.com/MichaelMure/go-term-text/left_pad.go new file mode 100644 index 00000000..a63fedb9 --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/left_pad.go @@ -0,0 +1,50 @@ +package text + +import ( + "bytes" + "strings" + + "github.com/mattn/go-runewidth" +) + +// LeftPadMaxLine pads a line on the left by a specified amount and pads the +// string on the right to fill the maxLength. +// If the given string is too long, it is truncated with an ellipsis. +// Handle properly terminal color escape code +func LeftPadMaxLine(line string, length, leftPad int) string { + cleaned, escapes := ExtractTermEscapes(line) + + scrWidth := runewidth.StringWidth(cleaned) + // truncate and ellipse if needed + if scrWidth+leftPad > length { + cleaned = runewidth.Truncate(cleaned, length-leftPad, "…") + } else if scrWidth+leftPad < length { + cleaned = runewidth.FillRight(cleaned, length-leftPad) + } + + rightPart := ApplyTermEscapes(cleaned, escapes) + pad := strings.Repeat(" ", leftPad) + + return pad + rightPart +} + +// LeftPad left pad each line of the given text +func LeftPadLines(text string, leftPad int) string { + var result bytes.Buffer + + pad := strings.Repeat(" ", leftPad) + + lines := strings.Split(text, "\n") + + for i, line := range lines { + result.WriteString(pad) + result.WriteString(line) + + // no additional line break at the end + if i < len(lines)-1 { + result.WriteString("\n") + } + } + + return result.String() +} diff --git a/vendor/github.com/MichaelMure/go-term-text/len.go b/vendor/github.com/MichaelMure/go-term-text/len.go new file mode 100644 index 00000000..c6bcaeac --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/len.go @@ -0,0 +1,45 @@ +package text + +import ( + "strings" + + "github.com/mattn/go-runewidth" +) + +// Len return the length of a string in a terminal, while ignoring the terminal +// escape sequences. +func Len(text string) int { + length := 0 + escape := false + + for _, char := range text { + if char == '\x1b' { + escape = true + } + if !escape { + length += runewidth.RuneWidth(char) + } + if char == 'm' { + escape = false + } + } + + return length +} + +// MaxLineLen return the length in a terminal of the longest line, while +// ignoring the terminal escape sequences. +func MaxLineLen(text string) int { + lines := strings.Split(text, "\n") + + max := 0 + + for _, line := range lines { + length := Len(line) + if length > max { + max = length + } + } + + return max +} diff --git a/vendor/github.com/MichaelMure/go-term-text/trim.go b/vendor/github.com/MichaelMure/go-term-text/trim.go new file mode 100644 index 00000000..eaf2ca0c --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/trim.go @@ -0,0 +1,28 @@ +package text + +import ( + "strings" + "unicode" +) + +// TrimSpace remove the leading and trailing whitespace while ignoring the +// terminal escape sequences. +// Returns the number of trimmed space on both side. +func TrimSpace(line string) string { + cleaned, escapes := ExtractTermEscapes(line) + + // trim left while counting + left := 0 + trimmed := strings.TrimLeftFunc(cleaned, func(r rune) bool { + if unicode.IsSpace(r) { + left++ + return true + } + return false + }) + + trimmed = strings.TrimRightFunc(trimmed, unicode.IsSpace) + + escapes = OffsetEscapes(escapes, -left) + return ApplyTermEscapes(trimmed, escapes) +} diff --git a/vendor/github.com/MichaelMure/go-term-text/truncate.go b/vendor/github.com/MichaelMure/go-term-text/truncate.go new file mode 100644 index 00000000..b51bb39e --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/truncate.go @@ -0,0 +1,24 @@ +package text + +import "github.com/mattn/go-runewidth" + +// TruncateMax truncate a line if its length is greater +// than the given length. Otherwise, the line is returned +// as is. If truncating occur, an ellipsis is inserted at +// the end. +// Handle properly terminal color escape code +func TruncateMax(line string, length int) string { + if length <= 0 { + return "…" + } + + l := Len(line) + if l <= length || l == 0 { + return line + } + + cleaned, escapes := ExtractTermEscapes(line) + truncated := runewidth.Truncate(cleaned, length-1, "") + + return ApplyTermEscapes(truncated, escapes) + "…" +} diff --git a/vendor/github.com/MichaelMure/go-term-text/wrap.go b/vendor/github.com/MichaelMure/go-term-text/wrap.go new file mode 100644 index 00000000..2fd6ed5f --- /dev/null +++ b/vendor/github.com/MichaelMure/go-term-text/wrap.go @@ -0,0 +1,334 @@ +package text + +import ( + "strings" + + "github.com/mattn/go-runewidth" +) + +// Force runewidth not to treat ambiguous runes as wide chars, so that things +// like unicode ellipsis/up/down/left/right glyphs can have correct runewidth +// and can be displayed correctly in terminals. +func init() { + runewidth.DefaultCondition.EastAsianWidth = false +} + +// Wrap a text for a given line size. +// Handle properly terminal color escape code +func Wrap(text string, lineWidth int) (string, int) { + return WrapLeftPadded(text, lineWidth, 0) +} + +// WrapLeftPadded wrap a text for a given line size with a left padding. +// Handle properly terminal color escape code +func WrapLeftPadded(text string, lineWidth int, leftPad int) (string, int) { + pad := strings.Repeat(" ", leftPad) + return WrapWithPad(text, lineWidth, pad) +} + +// WrapWithPad wrap a text for a given line size with a custom left padding +// Handle properly terminal color escape code +func WrapWithPad(text string, lineWidth int, pad string) (string, int) { + return WrapWithPadIndent(text, lineWidth, pad, pad) +} + +// WrapWithPad wrap a text for a given line size with a custom left padding +// This function also align the result depending on the requested alignment. +// Handle properly terminal color escape code +func WrapWithPadAlign(text string, lineWidth int, pad string, align Alignment) (string, int) { + return WrapWithPadIndentAlign(text, lineWidth, pad, pad, align) +} + +// WrapWithPadIndent wrap a text for a given line size with a custom left padding +// and a first line indent. The padding is not effective on the first line, indent +// is used instead, which allow to implement indents and outdents. +// Handle properly terminal color escape code +func WrapWithPadIndent(text string, lineWidth int, indent string, pad string) (string, int) { + return WrapWithPadIndentAlign(text, lineWidth, indent, pad, NoAlign) +} + +// WrapWithPadIndentAlign wrap a text for a given line size with a custom left padding +// and a first line indent. The padding is not effective on the first line, indent +// is used instead, which allow to implement indents and outdents. +// This function also align the result depending on the requested alignment. +// Handle properly terminal color escape code +func WrapWithPadIndentAlign(text string, lineWidth int, indent string, pad string, align Alignment) (string, int) { + var lines []string + nbLine := 0 + + // Start with the indent + padStr := indent + padLen := Len(indent) + + // tabs are formatted as 4 spaces + text = strings.Replace(text, "\t", " ", -1) + + // NOTE: text is first segmented into lines so that softwrapLine can handle. + for i, line := range strings.Split(text, "\n") { + // on the second line, use the padding instead + if i == 1 { + padStr = pad + padLen = Len(pad) + } + + if line == "" || strings.TrimSpace(line) == "" { + // nothing in the line, we just add the non-empty part of the padding + lines = append(lines, strings.TrimRight(padStr, " ")) + nbLine++ + continue + } + + wrapped := softwrapLine(line, lineWidth-padLen) + split := strings.Split(wrapped, "\n") + + if i == 0 && len(split) > 1 { + // the very first line got wrapped + // that means we need to switch to the normal padding + // use the first wrapped line, ignore everything else and + // wrap the remaining of the line with the normal padding. + + content := LineAlign(strings.TrimRight(split[0], " "), lineWidth-padLen, align) + lines = append(lines, padStr+content) + nbLine++ + line = strings.TrimPrefix(line, split[0]) + line = strings.TrimLeft(line, " ") + + padStr = pad + padLen = Len(pad) + wrapped = softwrapLine(line, lineWidth-padLen) + split = strings.Split(wrapped, "\n") + } + + for j, seg := range split { + if j == 0 { + // keep the left padding of the wrapped line + content := LineAlign(strings.TrimRight(seg, " "), lineWidth-padLen, align) + lines = append(lines, padStr+content) + } else { + content := LineAlign(strings.TrimSpace(seg), lineWidth-padLen, align) + lines = append(lines, padStr+content) + } + nbLine++ + } + } + + return strings.Join(lines, "\n"), nbLine +} + +// Break a line into several lines so that each line consumes at most +// 'textWidth' cells. Lines break at groups of white spaces and multibyte +// chars. Nothing is removed from the original text so that it behaves like a +// softwrap. +// +// Required: The line shall not contain '\n' +// +// WRAPPING ALGORITHM: The line is broken into non-breakable chunks, then line +// breaks ("\n") are inserted between these groups so that the total length +// between breaks does not exceed the required width. Words that are longer than +// the textWidth are broken into pieces no longer than textWidth. +func softwrapLine(line string, textWidth int) string { + escaped, escapes := ExtractTermEscapes(line) + + chunks := segmentLine(escaped) + // Reverse the chunk array so we can use it as a stack. + for i, j := 0, len(chunks)-1; i < j; i, j = i+1, j-1 { + chunks[i], chunks[j] = chunks[j], chunks[i] + } + + // for readability, minimal implementation of a stack: + + pop := func() string { + result := chunks[len(chunks)-1] + chunks = chunks[:len(chunks)-1] + return result + } + + push := func(chunk string) { + chunks = append(chunks, chunk) + } + + peek := func() string { + return chunks[len(chunks)-1] + } + + empty := func() bool { + return len(chunks) == 0 + } + + var out strings.Builder + + // helper to write in the output while interleaving the escape + // sequence at the correct places. + // note: the final algorithm will add additional line break in the original + // text. Those line break are *not* fed to this helper so the positions don't + // need to be offset, which make the whole thing much easier. + currPos := 0 + currItem := 0 + outputString := func(s string) { + for _, r := range s { + for currItem < len(escapes) && currPos == escapes[currItem].Pos { + out.WriteString(escapes[currItem].Item) + currItem++ + } + out.WriteRune(r) + currPos++ + } + } + + width := 0 + + for !empty() { + wl := Len(peek()) + + if width+wl <= textWidth { + // the chunk fit in the available space + outputString(pop()) + width += wl + if width == textWidth && !empty() { + // only add line break when there is more chunk to come + out.WriteRune('\n') + width = 0 + } + } else if wl > textWidth { + // words too long for a full line are split to fill the remaining space. + // But if the long words is the first non-space word in the middle of the + // line, preceding spaces shall not be counted in word splitting. + splitWidth := textWidth - width + if strings.HasSuffix(out.String(), "\n"+strings.Repeat(" ", width)) { + splitWidth += width + } + left, right := splitWord(pop(), splitWidth) + // remainder is pushed back to the stack for next round + push(right) + outputString(left) + out.WriteRune('\n') + width = 0 + } else { + // normal line overflow, we add a line break and try again + out.WriteRune('\n') + width = 0 + } + } + + // Don't forget the trailing escapes, if any. + for currItem < len(escapes) && currPos >= escapes[currItem].Pos { + out.WriteString(escapes[currItem].Item) + currItem++ + } + + return out.String() +} + +// Segment a line into chunks, where each chunk consists of chars with the same +// type and is not breakable. +func segmentLine(s string) []string { + var chunks []string + + var word string + wordType := none + flushWord := func() { + chunks = append(chunks, word) + word = "" + wordType = none + } + + for _, r := range s { + // A WIDE_CHAR itself constitutes a chunk. + thisType := runeType(r) + if thisType == wideChar { + if wordType != none { + flushWord() + } + chunks = append(chunks, string(r)) + continue + } + // Other type of chunks starts with a char of that type, and ends with a + // char with different type or end of string. + if thisType != wordType { + if wordType != none { + flushWord() + } + word = string(r) + wordType = thisType + } else { + word += string(r) + } + } + if word != "" { + flushWord() + } + + return chunks +} + +type RuneType int + +// Rune categories +// +// These categories are so defined that each category forms a non-breakable +// chunk. It IS NOT the same as unicode code point categories. +const ( + none RuneType = iota + wideChar + invisible + shortUnicode + space + visibleAscii +) + +// Determine the category of a rune. +func runeType(r rune) RuneType { + rw := runewidth.RuneWidth(r) + if rw > 1 { + return wideChar + } else if rw == 0 { + return invisible + } else if r > 127 { + return shortUnicode + } else if r == ' ' { + return space + } else { + return visibleAscii + } +} + +// splitWord split a word at the given length, while ignoring the terminal escape sequences +func splitWord(word string, length int) (string, string) { + runes := []rune(word) + var result []rune + added := 0 + escape := false + + if length == 0 { + return "", word + } + + for _, r := range runes { + if r == '\x1b' { + escape = true + } + + width := runewidth.RuneWidth(r) + if width+added > length { + // wide character made the length overflow + break + } + + result = append(result, r) + + if !escape { + added += width + if added >= length { + break + } + } + + if r == 'm' { + escape = false + } + } + + leftover := runes[len(result):] + + return string(result), string(leftover) +} |