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git-prompt.go
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git-prompt.go
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/*
git-prompt
To use just add $(git-prompt) to PS1, for example.
PS1='\u@\h:\w $(git-prompt)$ '
Ole Martin Bjorndalen
License: MIT
*/
package main
import (
"fmt"
"os/exec"
"strings"
)
func readCommand(cmdName string, cmdArgs []string) string {
var (
cmdOut []byte
err error
)
if cmdOut, err = exec.Command(cmdName, cmdArgs...).Output(); err != nil {
return ""
}
return string(cmdOut)
}
func getStatusText() string {
return readCommand("git", []string{"status", "--porcelain", "--branch"})
}
func getHeadHash() string {
return readCommand("git", []string{"rev-parse", "--verify", "HEAD"})
}
func splitIntoLines(text string) []string {
return strings.Split(strings.TrimSpace(text), "\n")
}
func getBranchName(line string) string {
return strings.Split(strings.Fields(line)[1], "...")[0]
}
func addBranchStatus(status map[string]bool, line string) {
// We're looking for what's inside the brackets:
// ## master...origin/master [ahead 1, behind 1]
if strings.Contains(line, "[") {
statusPart := strings.Split(line, "[")[1]
if strings.Contains(statusPart, "ahead") {
status["ahead"] = true
}
if strings.Contains(statusPart, "behind") {
status["behind"] = true
}
}
}
func addFileStatus(status map[string]bool, lines []string) {
conflictCodes := map[string]bool{
"DD": true,
"AU": true,
"UD": true,
"UA": true,
"DU": true,
"AA": true,
"UU": true,
}
for _, line := range lines {
xy := line[:2]
if xy == "??" {
status["untracked"] = true
} else if conflictCodes[xy] {
status["conflict"] = true
} else {
status["changed"] = true
}
}
}
func parseStatus(text string) (string, map[string]bool) {
status := make(map[string]bool)
lines := splitIntoLines(text)
branch := getBranchName(lines[0])
addBranchStatus(status, lines[0])
addFileStatus(status, lines[1:])
return branch, status
}
func colorText(text string, color string) string {
colors := map[string]string{
"green": "92",
"yellow": "93",
"red": "31",
}
return "\001\033[" + colors[color] + "m\002" + text + "\001\033[0m\002"
}
func formatStatus(branch string, status map[string]bool) string {
flags := ""
color := "green"
if status["changed"] {
flags += "*"
color = "yellow"
}
if status["untracked"] {
flags += "?"
color = "yellow"
}
if status["conflict"] {
flags += "!"
color = "red"
}
if status["ahead"] && status["behind"] {
flags += "↕"
} else if status["ahead"] {
flags += "↑"
} else if status["behind"] {
flags += "↓"
}
if flags != "" {
flags = " " + flags
}
text := fmt.Sprintf("[%s%s]", branch, flags)
return colorText(text, color)
}
func main() {
text := getStatusText()
if text != "" {
branch, status := parseStatus(text)
if branch == "HEAD" {
branch = ":" + getHeadHash()[:6]
}
fmt.Print(formatStatus(branch, status))
}
}