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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
"text/template"
)
// Version returns release version
const Version string = "2.0.0"
var (
output string
useTemplate bool
)
// A Command is an implementation of a buranko command
type Command struct {
// Run runs the command.
// The args are the arguments after the command name.
Run func(args []string) int
// UsageLine is the one-line usage message.
// The first word in the line is taken to be the command name.
UsageLine string
// Short is the short description shown in the 'buranko help' output.
Short string
// Long is the long message shown in the 'buranko help <this-command>' output.
Long string
// Flag is a set of flags specific to this command.
Flag flag.FlagSet
}
// Name returns the command's name: the first word in the usage line.
func (c *Command) Name() string {
name := c.UsageLine
i := strings.Index(name, " ")
if i >= 0 {
name = name[:i]
}
return name
}
// Usage returns the commands usage.
func (c *Command) Usage() {
fmt.Fprintf(os.Stderr, "usage: %s\n\n", c.UsageLine)
fmt.Fprintf(os.Stderr, "%s\n", strings.TrimSpace(c.Long))
os.Exit(2)
}
// Commands lists the available commands and help topics.
// The order here is the order in which they are printed by 'buranko help'.
var commands = []*Command{}
func main() {
flag.StringVar(&output, "output", "ID", "Output field")
flag.BoolVar(&useTemplate, "template", false, "Use the configured template in the output")
flag.Usage = usage
flag.Parse()
log.SetFlags(0)
args := flag.Args()
if len(args) < 1 {
doOutput()
return
}
if args[0] == "help" {
help(args[1:])
return
}
if args[0] == "version" {
version()
return
}
}
var usageTemplate = `buranko is a tool for parse a git branch name
Usage:
buranko commands [arguments]
The commands are:
help Show this help
version Output version information
Options:
-output
Specify an output field.
Available fields are FullName, Action, ID, LinkID, Description.
-template
Use the configured template in the output.
`
var helpTemplate = `usage: buranko {{.UsageLine}}
{{.Long | trim}}
`
// tmpl executes the given template text on data, writing the result to w.
func tmpl(w io.Writer, text string, data interface{}) {
t := template.New("top")
t.Funcs(template.FuncMap{"trim": strings.TrimSpace})
template.Must(t.Parse(text))
if err := t.Execute(w, data); err != nil {
panic(err)
}
}
func printUsage(w io.Writer) {
bw := bufio.NewWriter(w)
tmpl(bw, usageTemplate, commands)
bw.Flush()
}
func usage() {
printUsage(os.Stderr)
os.Exit(2)
}
// help implements the 'help' command.
func help(args []string) {
if len(args) == 0 {
printUsage(os.Stdout)
// not exit 2: succeeded at 'buranko help'.
return
}
if len(args) != 1 {
fmt.Fprintf(os.Stderr, "usage: buranko help command\n\nToo many arguments given.\n")
os.Exit(2) // failed at 'buranko help'
}
arg := args[0]
for _, cmd := range commands {
if cmd.Name() == arg {
tmpl(os.Stdout, helpTemplate, cmd)
// not exit 2: succeeded at 'buranko help cmd'.
return
}
}
fmt.Fprintf(os.Stderr, "Unknown help topic %#q. Run 'buranko help'.\n", arg)
os.Exit(2) // failed at 'buranko help cmd'
}
func version() {
fmt.Fprintf(os.Stdout, "branko version v%s\n", Version)
}
func doOutput() {
branchName := ""
stat, _ := os.Stdin.Stat()
if (stat.Mode() & os.ModeCharDevice) == 0 {
branchName = GetBranchNameFromStdin()
} else {
branchName = GetBranchNameFromGitCommand()
}
branch := Parse(branchName)
templateText := GetTemplate()
if useTemplate && len(templateText) > 0 {
tmpl, err := template.New("Format").Parse(templateText)
if err != nil {
log.Fatal(err)
}
writer := new(strings.Builder)
tmpl.Execute(writer, branch)
fmt.Print(writer.String())
return
}
switch output {
case "FullName":
fmt.Print(branch.FullName)
case "Action":
fmt.Print(branch.Action)
case "ID":
fmt.Print(branch.ID)
case "LinkID":
fmt.Print(branch.LinkID())
case "Description":
fmt.Print(branch.Description)
default:
fmt.Print("")
}
}