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|
package main
import (
"bytes"
"flag"
"go/parser"
"go/printer"
"go/ast"
"log"
"os"
)
var (
srcFn = flag.String("src", "", "source filename")
getName = flag.String("name", "", "func/type name to output")
html = flag.Bool("html", true, "output HTML")
showPkg = flag.Bool("pkg", false, "show package in output")
)
func main() {
// handle input
flag.Parse()
if *srcFn == "" || *getName == "" {
flag.Usage()
os.Exit(2)
}
// load file
file, err := parser.ParseFile(*srcFn, nil, nil, 0)
if err != nil {
log.Exit(err)
}
// create printer
p := &printer.Config{
Mode: 0,
Tabwidth: 8,
Styler: nil,
}
if *html {
p.Mode = printer.GenHTML
}
// create filter
filter := func(name string) bool {
return name == *getName
}
// filter
if !ast.FilterFile(file, filter) {
os.Exit(1)
}
b := new(bytes.Buffer)
p.Fprint(b, file)
// drop package declaration
if !*showPkg {
for {
c, err := b.ReadByte()
if c == '\n' || err != nil {
break
}
}
}
// drop leading newlines
for {
b, err := b.ReadByte()
if err != nil {
break
}
if b != '\n' {
os.Stdout.Write([]byte{b})
break
}
}
// output
b.WriteTo(os.Stdout)
}
|
