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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "io" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "golang.org/x/term" | ||
| ) | ||
|
|
||
| type help struct { | ||
| title, version string | ||
| usage map[int][]string | ||
| out io.Writer | ||
| } | ||
|
|
||
| var CLI = help{ | ||
| title: Title, | ||
| version: Version, | ||
| usage: map[int][]string{ | ||
| 0: {0: "--config", 1: "<file>", 2: "Specify config file"}, | ||
| 1: {0: "--nocolor", 1: "disable color and banner"}, | ||
| 2: {0: "--banner", 1: "show banner + version and exit"}, | ||
| 3: {0: "--genconfig", 1: "write default config to 'default.toml' then exit"}, | ||
| 4: {0: "--help", 1: "show this help and exit"}, | ||
| }, | ||
| out: os.Stdout, | ||
| } | ||
|
|
||
| func (cli help) secondColStart(index int) (max int) { | ||
| l := cli.firstColEnd() + 2 | ||
| if len(cli.usage[index]) > 2 && cli.usage[index][2] != "" { | ||
| l -= len(cli.usage[index][1]) | ||
| } | ||
| if l > max { | ||
| max = l | ||
| } | ||
| return max | ||
| } | ||
|
|
||
| func (cli help) firstColEnd() (max int) { | ||
| for n := range cli.usage { | ||
| l := len(cli.usage[n][0]) | ||
| if l > max { | ||
| max = l | ||
| } | ||
| } | ||
| return max | ||
| } | ||
|
|
||
| func (cli help) stdout(s ...string) { | ||
| for _, v := range s { | ||
| _, _ = cli.out.Write([]byte(v)) | ||
| } | ||
| } | ||
|
|
||
| func (cli help) lb(n int) { | ||
| for n > 0 { | ||
| cli.stdout("\n") | ||
| n-- | ||
| } | ||
| } | ||
|
|
||
| func (cli help) printUsage() { | ||
| if !term.IsTerminal(int(os.Stdout.Fd())) { | ||
| os.Exit(1) | ||
| } | ||
| cli.header() | ||
|
|
||
| for n := 0; n < len(cli.usage); n++ { | ||
| line := &strings.Builder{} | ||
| buf := &strings.Builder{} | ||
| usageAt := 1 | ||
| tlen := cli.secondColStart(n) | ||
| switch { | ||
| case cli.usage[n][0] == "": | ||
| cli.lb(1) | ||
| case cli.usage[n][1] == "": | ||
| cli.stdout(cli.usage[n][0]) | ||
| cli.lb(2) | ||
| case len(cli.usage[n]) > 2 && cli.usage[n][2] != "": | ||
| tlen = cli.firstColEnd() - len(cli.usage[n][1]) | ||
| usageAt = 2 | ||
| fallthrough | ||
| default: | ||
| buf.WriteString(cli.usage[n][0]) | ||
| } | ||
| if tlen < 0 { | ||
| tlen = 2 | ||
| } | ||
| tab := strings.Repeat(" ", tlen) | ||
| line.WriteString(" ") | ||
| if buf.Len() < cli.firstColEnd() { | ||
| line.WriteString(strings.Repeat(" ", cli.firstColEnd()-buf.Len())) | ||
| } | ||
| if usageAt == 2 { | ||
| buf.WriteString(strings.Repeat(" ", tlen/2)) | ||
| buf.WriteString(cli.usage[n][1]) | ||
| } | ||
| buf.WriteString(tab) | ||
| buf.Write([]byte(" (" + cli.usage[n][usageAt] + ")")) | ||
| buf.Write([]byte{'\n'}) | ||
| line.Write([]byte(buf.String())) | ||
| cli.stdout(line.String()) | ||
| } | ||
| os.Exit(0) | ||
|
|
||
| } | ||
|
|
||
| func (cli help) header() { | ||
| cli.stdout("\n") | ||
| s := &strings.Builder{} | ||
| s.Write([]byte(cli.title)) | ||
| s.Write([]byte(" v[")) | ||
| s.Write([]byte(cli.version)) | ||
| s.Write([]byte("]")) | ||
| tab := cli.firstColEnd() - (s.Len() % 2) + 1 | ||
| if tab > 0 { | ||
| cli.stdout(strings.Repeat(" ", tab)) | ||
| } | ||
| cli.stdout(s.String()) | ||
| cli.lb(2) | ||
| } |