bin/prompt.go
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package main
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
)
// getRepoRoot returns the full path to the root
// of the closest git dir
func gitTopLevel() string {
path, err := exec.Command("git", "rev-parse", "--show-toplevel").Output()
if err != nil {
// assume the error means there's no git
// dir above us
return "/"
}
return strings.TrimSpace(string(path))
}
func resolveEmoji(hostname string) string {
emoji := "💀"
if hostname == "zora" {
emoji = "🌸"
} else if hostname == "nostromo" {
emoji = "🛸"
}
return emoji
}
func main() {
wd, _ := os.Getwd()
cwd, _ := filepath.EvalSymlinks(wd)
host, _ := os.Hostname()
home := os.Getenv("HOME")
now := time.Now().Format("15:04:05")
emoji := resolveEmoji(host)
fmt.Printf("%s %s ", now, emoji)
var promptRoot string
gitTop := gitTopLevel()
if gitTop == home {
promptRoot = "~"
} else {
promptRoot = filepath.Base(gitTop)
}
// subtract the git toplevel "/home/j3s"
// from the cwd "/home/j3s/code/nongitdir"
// to get the suffix "/code/nongitdir"
// os.cwd gets the symlink, git does not
suffix := cwd[len(gitTop):]
fmt.Printf("%s", promptRoot)
var parts []string
parts = strings.Split(suffix, "/")
for i, part := range parts {
if i == len(parts)-1 {
fmt.Printf("%s", part)
} else {
if len(part) != 0 {
fmt.Printf("%c/", part[0])
} else {
fmt.Printf("/")
}
}
}
}