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powerline.go
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powerline.go
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package main
import (
"bytes"
"fmt"
"strings"
"os"
"strconv"
"github.com/mattn/go-runewidth"
"golang.org/x/crypto/ssh/terminal"
"golang.org/x/text/width"
)
type ShellInfo struct {
rootIndicator string
colorTemplate string
escapedDollar string
escapedBacktick string
escapedBackslash string
evalPromptPrefix string
evalPromptSuffix string
evalPromptRightPrefix string
evalPromptRightSuffix string
}
type powerline struct {
args args
cwd string
pathAliases map[string]string
theme Theme
shellInfo ShellInfo
reset string
symbolTemplates Symbols
priorities map[string]int
ignoreRepos map[string]bool
Segments [][]segment
curSegment int
align alignment
rightPowerline *powerline
appendEastAsianPadding int
}
func newPowerline(args args, cwd string, priorities map[string]int, align alignment) *powerline {
p := new(powerline)
p.args = args
p.cwd = cwd
p.theme = themes[*args.Theme]
p.shellInfo = shellInfos[*args.Shell]
p.reset = fmt.Sprintf(p.shellInfo.colorTemplate, "[0m")
p.symbolTemplates = symbolTemplates[*args.Mode]
p.priorities = priorities
p.align = align
p.ignoreRepos = make(map[string]bool)
for _, r := range strings.Split(*args.IgnoreRepos, ",") {
if r == "" {
continue
}
p.ignoreRepos[r] = true
}
p.pathAliases = make(map[string]string)
for _, pa := range strings.Split(*args.PathAliases, ",") {
if pa == "" {
continue
}
kv := strings.SplitN(pa, "=", 2)
p.pathAliases[kv[0]] = kv[1]
}
p.Segments = make([][]segment, 1)
var mods string
if p.align == alignLeft {
mods = *args.Modules
if len(*args.ModulesRight) > 0 {
if p.supportsRightModules() {
p.rightPowerline = newPowerline(args, cwd, priorities, alignRight)
} else {
mods += `,` + *args.ModulesRight
}
}
} else {
mods = *args.ModulesRight
}
for _, module := range strings.Split(mods, ",") {
elem, ok := modules[module]
if !ok {
println("Module not found: " + module)
continue
}
elem(p)
}
return p
}
func (p *powerline) color(prefix string, code uint8) string {
if code == p.theme.Reset {
return p.reset
} else {
return fmt.Sprintf(p.shellInfo.colorTemplate, fmt.Sprintf("[%s;5;%dm", prefix, code))
}
}
func (p *powerline) fgColor(code uint8) string {
return p.color("38", code)
}
func (p *powerline) bgColor(code uint8) string {
return p.color("48", code)
}
func (p *powerline) appendSegment(origin string, segment segment) {
if segment.separator == "" {
if p.isRightPrompt() {
segment.separator = p.symbolTemplates.SeparatorReverse
} else {
segment.separator = p.symbolTemplates.Separator
}
}
if segment.separatorForeground == 0 {
segment.separatorForeground = segment.background
}
priority, _ := p.priorities[origin]
segment.priority += priority
segment.width = segment.computeWidth(*p.args.Condensed)
p.Segments[p.curSegment] = append(p.Segments[p.curSegment], segment)
}
func (p *powerline) newRow() {
p.Segments = append(p.Segments, make([]segment, 0))
p.curSegment = p.curSegment + 1
}
func termWidth() int {
termWidth, _, err := terminal.GetSize(int(os.Stdin.Fd()))
if err != nil {
shellMaxLengthStr, found := os.LookupEnv("COLUMNS")
if !found {
return 0
}
shellMaxLength64, err := strconv.ParseInt(shellMaxLengthStr, 0, 64)
if err != nil {
return 0
}
termWidth = int(shellMaxLength64)
}
return termWidth
}
func (p *powerline) truncateRow(rowNum int) {
shellMaxLength := termWidth() * *p.args.MaxWidthPercentage / 100
row := p.Segments[rowNum]
rowLength := 0
if shellMaxLength > 0 {
for _, segment := range row {
rowLength += segment.width
}
if rowLength > shellMaxLength && *p.args.TruncateSegmentWidth > 0 {
minPriorityNotTruncated := MaxInteger
minPriorityNotTruncatedSegmentId := -1
for idx, segment := range row {
if segment.width > *p.args.TruncateSegmentWidth && segment.priority < minPriorityNotTruncated {
minPriorityNotTruncated = segment.priority
minPriorityNotTruncatedSegmentId = idx
}
}
for minPriorityNotTruncatedSegmentId != -1 && rowLength > shellMaxLength {
segment := row[minPriorityNotTruncatedSegmentId]
rowLength -= segment.width
segment.content = runewidth.Truncate(segment.content, *p.args.TruncateSegmentWidth-runewidth.StringWidth(segment.separator)-3, "…")
segment.width = segment.computeWidth(*p.args.Condensed)
row = append(append(row[:minPriorityNotTruncatedSegmentId], segment), row[minPriorityNotTruncatedSegmentId+1:]...)
rowLength += segment.width
minPriorityNotTruncated = MaxInteger
minPriorityNotTruncatedSegmentId = -1
for idx, segment := range row {
if segment.width > *p.args.TruncateSegmentWidth && segment.priority < minPriorityNotTruncated {
minPriorityNotTruncated = segment.priority
minPriorityNotTruncatedSegmentId = idx
}
}
}
}
for rowLength > shellMaxLength {
minPriority := MaxInteger
minPrioritySegmentId := -1
for idx, segment := range row {
if segment.priority < minPriority {
minPriority = segment.priority
minPrioritySegmentId = idx
}
}
if minPrioritySegmentId != -1 {
segment := row[minPrioritySegmentId]
row = append(row[:minPrioritySegmentId], row[minPrioritySegmentId+1:]...)
rowLength -= segment.width
}
}
}
p.Segments[rowNum] = row
}
func (p *powerline) numEastAsianRunes(segmentContent *string) int {
if *p.args.EastAsianWidth {
return 0
}
numEastAsianRunes := 0
for _, r := range *segmentContent {
switch width.LookupRune(r).Kind() {
case width.Neutral:
case width.EastAsianAmbiguous:
numEastAsianRunes += 1
case width.EastAsianWide:
case width.EastAsianNarrow:
case width.EastAsianFullwidth:
case width.EastAsianHalfwidth:
}
}
return numEastAsianRunes
}
func (p *powerline) drawRow(rowNum int, buffer *bytes.Buffer) {
row := p.Segments[rowNum]
numEastAsianRunes := 0
// Prepend padding
if p.isRightPrompt() {
buffer.WriteRune(' ')
}
for idx, segment := range row {
if segment.hideSeparators {
buffer.WriteString(segment.content)
continue
}
var separatorBackground string
if p.isRightPrompt() {
if idx == 0 {
separatorBackground = p.reset
} else {
prevSegment := row[idx-1]
separatorBackground = p.bgColor(prevSegment.background)
}
buffer.WriteString(separatorBackground)
buffer.WriteString(p.fgColor(segment.separatorForeground))
buffer.WriteString(segment.separator)
} else {
if idx >= len(row)-1 {
if !p.hasRightModules() || p.supportsRightModules() {
separatorBackground = p.reset
} else if p.hasRightModules() && rowNum >= len(p.Segments)-1 {
nextSegment := p.rightPowerline.Segments[0][0]
separatorBackground = p.bgColor(nextSegment.background)
}
} else {
nextSegment := row[idx+1]
separatorBackground = p.bgColor(nextSegment.background)
}
}
buffer.WriteString(p.fgColor(segment.foreground))
buffer.WriteString(p.bgColor(segment.background))
if !*p.args.Condensed {
buffer.WriteRune(' ')
}
buffer.WriteString(segment.content)
numEastAsianRunes += p.numEastAsianRunes(&segment.content)
if !*p.args.Condensed {
buffer.WriteRune(' ')
}
if !p.isRightPrompt() {
buffer.WriteString(separatorBackground)
buffer.WriteString(p.fgColor(segment.separatorForeground))
buffer.WriteString(segment.separator)
}
buffer.WriteString(p.reset)
}
// Append padding before cursor for left-aligned prompts
if !p.isRightPrompt() || !p.hasRightModules() {
buffer.WriteRune(' ')
}
// Don't append padding for right-aligned modules
if !p.isRightPrompt() {
for i := 0; i < numEastAsianRunes; i++ {
buffer.WriteRune(' ')
}
}
}
func (p *powerline) draw() string {
var buffer bytes.Buffer
if *p.args.Eval {
if p.align == alignLeft {
buffer.WriteString(p.shellInfo.evalPromptPrefix)
} else if p.supportsRightModules() {
buffer.WriteString(p.shellInfo.evalPromptRightPrefix)
}
}
for rowNum := range p.Segments {
p.truncateRow(rowNum)
p.drawRow(rowNum, &buffer)
if rowNum < len(p.Segments)-1 {
buffer.WriteRune('\n')
}
}
if *p.args.PromptOnNewLine {
buffer.WriteRune('\n')
var foreground, background uint8
if *p.args.PrevError == 0 {
foreground = p.theme.CmdPassedFg
background = p.theme.CmdPassedBg
} else {
foreground = p.theme.CmdFailedFg
background = p.theme.CmdFailedBg
}
buffer.WriteString(p.fgColor(foreground))
buffer.WriteString(p.bgColor(background))
buffer.WriteString(p.shellInfo.rootIndicator)
buffer.WriteString(p.reset)
buffer.WriteString(p.fgColor(background))
buffer.WriteString(p.symbolTemplates.Separator)
buffer.WriteString(p.reset)
buffer.WriteRune(' ')
}
if *p.args.Eval {
switch p.align {
case alignLeft:
buffer.WriteString(p.shellInfo.evalPromptSuffix)
if p.supportsRightModules() {
buffer.WriteRune('\n')
if !p.hasRightModules() {
buffer.WriteString(p.shellInfo.evalPromptRightPrefix + p.shellInfo.evalPromptRightSuffix)
}
}
case alignRight:
if p.supportsRightModules() {
buffer.WriteString(p.shellInfo.evalPromptSuffix)
}
}
if p.hasRightModules() {
buffer.WriteString(p.rightPowerline.draw())
}
}
return buffer.String()
}
func (p *powerline) hasRightModules() bool {
return p.rightPowerline != nil && len(p.rightPowerline.Segments[0]) > 0
}
func (p *powerline) supportsRightModules() bool {
return p.shellInfo.evalPromptRightPrefix != "" || p.shellInfo.evalPromptRightSuffix != ""
}
func (p *powerline) isRightPrompt() bool {
return p.align == alignRight && p.supportsRightModules()
}