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124 lines
3.2 KiB
124 lines
3.2 KiB
// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// strip_unneeded is a tool that attempts to remove unnecessary lines from a
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// file by running a test script after each marked line is removed.
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//
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// strip_unneeded will scan the file specified by the --file argument for lines
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// that contain the substring specified by the --marker argument. One-by-one
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// those marked lines will be removed from the file, after which the test script
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// specified by --test will be run. If the test passes (the process completes
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// with a 0 return code), then the line will remain removed, otherwise it is
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// restored. This will repeat for every line in the file containing the marker,
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// until all lines are tested.
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"strings"
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)
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var (
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file = flag.String("file", "", "file to modify")
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marker = flag.String("marker", "CHECK_NEEDED", "line token")
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test = flag.String("test", "", "test script to run with each change")
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)
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func main() {
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if err := run(); err != nil {
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fmt.Println(err.Error())
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os.Exit(1)
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}
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}
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func run() error {
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flag.Parse()
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if *file == "" {
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return fmt.Errorf("Missing --file argument")
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}
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if *marker == "" {
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return fmt.Errorf("Missing --marker argument")
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}
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if *test == "" {
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return fmt.Errorf("Missing --test argument")
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}
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// make sure the test passes with no modifications
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if err := runTest(); err != nil {
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return fmt.Errorf("Test fails with no modifications.\n%v", err)
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}
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// load the test file
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body, err := ioutil.ReadFile(*file)
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if err != nil {
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return fmt.Errorf("Couldn't load file '%v'", *file)
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}
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// gather all the lines
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allLines := strings.Split(string(body), "\n")
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// find all the lines with the marker
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markerLines := make([]int, 0, len(allLines))
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for i, l := range allLines {
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if strings.Contains(l, *marker) {
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markerLines = append(markerLines, i)
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}
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}
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omit := map[int]bool{}
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save := func() error {
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f, err := os.Create(*file)
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if err != nil {
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return err
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}
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defer f.Close()
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for i, l := range allLines {
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if !omit[i] {
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f.WriteString(l)
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f.WriteString("\n")
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}
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}
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return nil
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}
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for i, l := range markerLines {
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omit[l] = true
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if err := save(); err != nil {
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return err
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}
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if err := runTest(); err != nil {
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omit[l] = false
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fmt.Printf("%d/%d: Test fails when removing line %v: %v\n", i, len(markerLines), l, allLines[l])
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} else {
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fmt.Printf("%d/%d: Test passes when removing line %v: %v\n", i, len(markerLines), l, allLines[l])
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}
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}
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return save()
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}
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func runTest() error {
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cmd := exec.Command("sh", "-c", *test)
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out, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("Test failed with error: %v\n%v", err, string(out))
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}
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return nil
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}
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