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|
//go:build !windows
package main
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"path/filepath"
"strings"
)
func adjustDependencies(w io.Writer, baseDir string, deps []dependency) error {
for _, dep := range deps {
relativeFile, err := filepath.Rel(baseDir, dep.file)
if err != nil {
return err
}
if len(dep.prerequisites) == 0 {
_, err := fmt.Fprintf(w, "%s:\n\n", relativeFile)
if err != nil {
return err
}
continue
}
var prereqs []string
for _, prereq := range dep.prerequisites {
relativePrereq, err := filepath.Rel(baseDir, prereq)
if err != nil {
return err
}
prereqs = append(prereqs, relativePrereq)
}
_, err = fmt.Fprintf(w, "%s: \\\n %s\n\n", relativeFile, strings.Join(prereqs, " \\\n "))
if err != nil {
return err
}
}
return nil
}
type dependency struct {
file string
prerequisites []string
}
func parseDependencies(baseDir string, in io.Reader) ([]dependency, error) {
abs := func(path string) string {
if filepath.IsAbs(path) {
return path
}
return filepath.Join(baseDir, path)
}
scanner := bufio.NewScanner(in)
var line strings.Builder
var deps []dependency
for scanner.Scan() {
buf := scanner.Bytes()
if line.Len()+len(buf) > 1024*1024 {
return nil, errors.New("line too long")
}
if bytes.HasSuffix(buf, []byte{'\\'}) {
line.Write(buf[:len(buf)-1])
continue
}
line.Write(buf)
if line.Len() == 0 {
// Skip empty lines
continue
}
parts := strings.SplitN(line.String(), ":", 2)
if len(parts) < 2 {
return nil, fmt.Errorf("invalid line without ':'")
}
// NB: This doesn't handle filenames with spaces in them.
// It seems like make doesn't do that either, so oh well.
var prereqs []string
for _, prereq := range strings.Fields(parts[1]) {
prereqs = append(prereqs, abs(prereq))
}
deps = append(deps, dependency{
abs(string(parts[0])),
prereqs,
})
line.Reset()
}
if err := scanner.Err(); err != nil {
return nil, err
}
// There is always at least a dependency for the main file.
if len(deps) == 0 {
return nil, fmt.Errorf("empty dependency file")
}
return deps, nil
}
|
