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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kati
import (
"bytes"
"os"
"path/filepath"
)
func exists(filename string) bool {
_, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return true
}
func existsInVPATH(ev *Evaluator, target string) (string, bool) {
if exists(target) {
return target, true
}
vpath, found := ev.vars["VPATH"]
if !found {
return target, false
}
// TODO(ukai): support vpath directive (pattern vpath).
// TODO(ukai): ok to cache vpath value?
abuf := newBuf()
err := vpath.Eval(abuf, ev)
if err != nil {
return target, false
}
// In the 'VPATH' variable, directory names are separated by colons
// or blanks. (on windows, semi-colons)
ws := newWordScanner(abuf.Bytes())
for ws.Scan() {
for _, dir := range bytes.Split(ws.Bytes(), []byte{':'}) {
vtarget := filepath.Join(string(dir), target)
if exists(vtarget) {
return vtarget, true
}
}
}
freeBuf(abuf)
return target, false
}
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