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jfa-go/help.go

89 lines
1.9 KiB

package main
import (
"bufio"
"bytes"
"flag"
"fmt"
"os"
"strings"
)
/* Adds start/stop/systemd to help message, and
also gets rid of usage for shorthand flags, and merge them with the full-length one.
implementation is 🤢, will clean this up eventually.
-h SHORTHAND
-help
prints this message.
becomes:
-help, -h
prints this message.
*/
func helpFunc() {
fmt.Fprint(os.Stderr, `Usage of jfa-go:
start
start jfa-go as a daemon and run in the background.
stop
stop a daemonized instance of jfa-go.
systemd
generate a systemd .service file.
`)
shortHands := []string{"-help", "-data", "-config", "-port"}
var b bytes.Buffer
// Write defaults into buffer then remove any shorthands
flag.CommandLine.SetOutput(&b)
flag.PrintDefaults()
flag.CommandLine.SetOutput(os.Stderr)
scanner := bufio.NewScanner(&b)
out := ""
line := scanner.Text()
eof := !scanner.Scan()
lastLine := false
for !eof || lastLine {
nextline := scanner.Text()
start := 0
if len(nextline) != 0 {
for nextline[start] == ' ' && start < len(nextline) {
start++
}
}
if strings.Contains(line, "SHORTHAND") || (len(nextline) != 0 && strings.Contains(nextline, "SHORTHAND") && nextline[start] != '-') {
line = nextline
if lastLine {
break
}
eof := !scanner.Scan()
if eof {
lastLine = true
}
continue
}
// if !strings.Contains(line, "SHORTHAND") && !(strings.Contains(nextline, "SHORTHAND") && !strings.Contains(nextline, "-")) {
match := false
for i, c := range line {
if c != '-' {
continue
}
for _, s := range shortHands {
if i+len(s) <= len(line) && line[i:i+len(s)] == s {
out += line[:i+len(s)] + ", " + s[:2] + line[i+len(s):] + "\n"
match = true
break
}
}
}
if !match {
out += line + "\n"
}
line = nextline
if lastLine {
break
}
eof := !scanner.Scan()
if eof {
lastLine = true
}
}
fmt.Fprint(os.Stderr, out)
}