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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"strconv"
"strings"
"time"
"git.fractalqb.de/fractalqb/nmconv"
)
//go:generate versioner ../VERSION ./version.go
var mkName = nmconv.Conversion{
Denorm: nmconv.Camel1Up,
Norm: nmconv.Unsep("_"),
}
type att struct {
key, val string
}
func readInput(filename string) (res []att) {
f, err := os.Open(filename)
if err != nil {
log.Fatal(err)
}
defer f.Close()
scn := bufio.NewScanner(f)
for scn.Scan() {
line := scn.Text()
if len(strings.TrimSpace(line)) == 0 {
continue
}
sep := strings.IndexRune(line, '=')
if sep > 0 {
a := att{key: line[:sep], val: line[sep+1:]}
res = append(res, a)
} else {
log.Fatal("syntax error: ", line)
}
}
return res
}
func writeInput(filename string, attls []att) {
tmpnm := filename + "~"
f, err := os.Create(tmpnm)
if err != nil {
log.Fatal(err)
}
defer func() {
if f != nil {
f.Close()
}
}()
for _, a := range attls {
fmt.Fprintf(f, "%s=%s\n", a.key, a.val)
}
err = f.Close()
f = nil
if err != nil {
log.Fatal(err)
}
os.Rename(tmpnm, filename)
}
func writeOutput(filename string, atts []att) (bnoChanged []att) {
f, err := os.Create(filename)
if err != nil {
log.Fatal(err)
}
defer f.Close()
fmt.Fprintf(f, "package %s\n\nconst (\n", *flagPkg)
hadBno := false
for i, a := range atts {
if a.key == *flagBno {
n, err := strconv.Atoi(a.val)
if err != nil {
log.Fatalf("invalid build number '%s' in attribute %s", a.val, a.key)
}
a.val = strconv.Itoa(n + 1)
atts[i].val = a.val
hadBno = true
}
atnm := mkName.Convert(a.key)
fmt.Fprintf(f, "\t%s%s = %s\n", *flagPfx, atnm, a.val)
}
if !hadBno {
if len(*flagBno) > 0 {
a := att{key: *flagBno, val: "1"}
atts = append(atts, a)
atnm := mkName.Convert(*flagBno)
fmt.Fprintf(f, "\t%s%s = %s\n", *flagPfx, atnm, a.val)
} else {
atts = nil
}
}
if len(*flagTim) > 0 {
fmt.Fprintf(f, "\t%s%s = \"%s\"\n", *flagPfx, *flagTim,
time.Now().Format(time.RFC3339))
}
fmt.Fprintln(f, ")")
return atts
}
func usage() {
fmt.Fprintf(os.Stderr, "%s v%d.%d.%d%s (%d)\n",
os.Args[0], Major, Minor, Bugfix, Quality, BuildNo)
fmt.Fprintln(os.Stderr, "Usage: [flags] input output")
fmt.Fprintln(os.Stderr, "Flags:")
flag.PrintDefaults()
}
var (
flagBno = flag.String("bno", "", "use build number attribute")
flagPkg = flag.String("pkg", "main", "set the package name for generated file")
flagPfx = flag.String("p", "", "set name prefix for version constants")
flagTim = flag.String("t", "", "generate timestamp attribute")
)
func main() {
flag.Usage = usage
flag.Parse()
inNm := flag.Arg(0)
if len(inNm) == 0 {
log.Fatal("missing input file argument")
}
ouNm := flag.Arg(1)
if len(ouNm) == 0 {
log.Fatal("missing output file argument")
}
attls := readInput(inNm)
attls = writeOutput(ouNm, attls)
if attls != nil {
writeInput(inNm, attls)
}
}