| // 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? |
| wb := newWbuf() |
| err := vpath.Eval(wb, ev) |
| if err != nil { |
| return target, false |
| } |
| // In the 'VPATH' variable, directory names are separated by colons |
| // or blanks. (on windows, semi-colons) |
| for _, word := range wb.words { |
| for _, dir := range bytes.Split(word, []byte{':'}) { |
| vtarget := filepath.Join(string(dir), target) |
| if exists(vtarget) { |
| return vtarget, true |
| } |
| } |
| } |
| wb.release() |
| return target, false |
| } |