66 lines
2.5 KiB
Go
66 lines
2.5 KiB
Go
// Copyright 2020 Google Inc. 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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package bp2build
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import (
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"android/soong/android"
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"fmt"
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"os"
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"strings"
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)
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// Codegen is the backend of bp2build. The code generator is responsible for
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// writing .bzl files that are equivalent to Android.bp files that are capable
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// of being built with Bazel.
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func Codegen(ctx *CodegenContext) CodegenMetrics {
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outputDir := android.PathForOutput(ctx, "bp2build")
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android.RemoveAllOutputDir(outputDir)
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buildToTargets, metrics := GenerateBazelTargets(ctx)
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filesToWrite := CreateBazelFiles(nil, buildToTargets, ctx.mode)
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generatedBuildFiles := []string{}
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for _, f := range filesToWrite {
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p := getOrCreateOutputDir(outputDir, ctx, f.Dir).Join(ctx, f.Basename)
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if err := writeFile(ctx, p, f.Contents); err != nil {
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fmt.Errorf("Failed to write %q (dir %q) due to %q", f.Basename, f.Dir, err)
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}
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// if these generated files are modified, regenerate on next run.
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generatedBuildFiles = append(generatedBuildFiles, p.String())
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}
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// The MANIFEST file contains the full list of files generated by bp2build, excluding itself.
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// Its purpose is for downstream tools to understand the set of files converted by bp2build.
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manifestFile := outputDir.Join(ctx, "MANIFEST")
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writeFile(ctx, manifestFile, strings.Join(generatedBuildFiles, "\n"))
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generatedBuildFiles = append(generatedBuildFiles, manifestFile.String())
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return metrics
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}
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// Get the output directory and create it if it doesn't exist.
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func getOrCreateOutputDir(outputDir android.OutputPath, ctx android.PathContext, dir string) android.OutputPath {
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dirPath := outputDir.Join(ctx, dir)
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android.CreateOutputDirIfNonexistent(dirPath, os.ModePerm)
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return dirPath
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}
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func writeFile(ctx android.PathContext, pathToFile android.OutputPath, content string) error {
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// These files are made editable to allow users to modify and iterate on them
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// in the source tree.
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return android.WriteFileToOutputDir(pathToFile, []byte(content), 0644)
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}
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