Merge "Add pom2mk, a maven repo -> Android.mk tool"

am: 6b78fa8c01

Change-Id: I7c9da93aa590efef002c55011d66d45aaa03c200

cmd/pom2mk/Android.bp

@@ -0,0 +1,19 @@
+// Copyright 2017 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.
+
+blueprint_go_binary {
+    name: "pom2mk",
+    deps: ["blueprint-proptools"],
+    srcs: ["pom2mk.go"],
+}

cmd/pom2mk/pom2mk.go

@@ -0,0 +1,254 @@
+// Copyright 2017 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 main
+
+import (
+	"encoding/xml"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+	"text/template"
+
+	"github.com/google/blueprint/proptools"
+)
+
+type RewriteNames []RewriteName
+type RewriteName struct {
+	regexp *regexp.Regexp
+	repl   string
+}
+
+func (r *RewriteNames) String() string {
+	return ""
+}
+
+func (r *RewriteNames) Set(v string) error {
+	split := strings.SplitN(v, "=", 2)
+	if len(split) != 2 {
+		return fmt.Errorf("Must be in the form of <regex>=<replace>")
+	}
+	regex, err := regexp.Compile(split[0])
+	if err != nil {
+		return nil
+	}
+	*r = append(*r, RewriteName{
+		regexp: regex,
+		repl:   split[1],
+	})
+	return nil
+}
+
+func (r *RewriteNames) Rewrite(name string) string {
+	for _, r := range *r {
+		if r.regexp.MatchString(name) {
+			return r.regexp.ReplaceAllString(name, r.repl)
+		}
+	}
+	return name
+}
+
+var rewriteNames = RewriteNames{}
+
+type ExtraDeps map[string][]string
+
+func (d ExtraDeps) String() string {
+	return ""
+}
+
+func (d ExtraDeps) Set(v string) error {
+	split := strings.SplitN(v, "=", 2)
+	if len(split) != 2 {
+		return fmt.Errorf("Must be in the form of <module>=<module>[,<module>]")
+	}
+	d[split[0]] = strings.Split(split[1], ",")
+	return nil
+}
+
+var extraDeps = make(ExtraDeps)
+
+type Dependency struct {
+	XMLName xml.Name `xml:"dependency"`
+
+	GroupId    string `xml:"groupId"`
+	ArtifactId string `xml:"artifactId"`
+	Version    string `xml:"version"`
+	Type       string `xml:"type"`
+
+	Scope string `xml:"scope"`
+}
+
+type Pom struct {
+	XMLName xml.Name `xml:"http://maven.apache.org/POM/4.0.0 project"`
+
+	ArtifactFile string `xml:"-"`
+
+	GroupId    string `xml:"groupId"`
+	ArtifactId string `xml:"artifactId"`
+	Version    string `xml:"version"`
+	Packaging  string `xml:"packaging"`
+
+	Dependencies []Dependency `xml:"dependencies>dependency"`
+}
+
+func (p Pom) MkName() string {
+	return rewriteNames.Rewrite(p.ArtifactId)
+}
+
+func (p Pom) MkDeps() []string {
+	var ret []string
+	for _, d := range p.Dependencies {
+		if d.Type != "aar" {
+			continue
+		}
+		name := rewriteNames.Rewrite(d.ArtifactId)
+		ret = append(ret, name)
+		ret = append(ret, extraDeps[name]...)
+	}
+	return ret
+}
+
+var mkTemplate = template.Must(template.New("mk").Parse(`
+include $(CLEAR_VARS)
+LOCAL_MODULE := {{.MkName}}
+LOCAL_MODULE_CLASS := JAVA_LIBRARIES
+LOCAL_UNINSTALLABLE_MODULE := true
+LOCAL_SRC_FILES := {{.ArtifactFile}}
+LOCAL_BUILT_MODULE_STEM := javalib.jar
+LOCAL_MODULE_SUFFIX := .{{.Packaging}}
+LOCAL_USE_AAPT2 := true
+LOCAL_STATIC_ANDROID_LIBRARIES := \
+{{range .MkDeps}}  {{.}} \
+{{end}}
+include $(BUILD_PREBUILT)
+`))
+
+func convert(filename string, out io.Writer) error {
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+
+	var pom Pom
+	err = xml.Unmarshal(data, &pom)
+	if err != nil {
+		return err
+	}
+
+	if pom.Packaging == "" {
+		pom.Packaging = "jar"
+	}
+
+	pom.ArtifactFile = strings.TrimSuffix(filename, ".pom") + "." + pom.Packaging
+
+	return mkTemplate.Execute(out, pom)
+}
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, `pom2mk, a tool to create Android.mk files from maven repos
+
+The tool will extract the necessary information from *.pom files to create an Android.mk whose
+aar libraries can be linked against when using AAPT2.
+
+Usage: %s [--rewrite <regex>=<replace>] [--extra-deps <module>=<module>[,<module>]] <dir>
+
+  -rewrite <regex>=<replace>
+     rewrite can be used to specify mappings between the artifactId in the pom files and module
+     names in the Android.mk files. This can be specified multiple times, the first matching
+     regex will be used.
+  -extra-deps <module>=<module>[,<module>]
+     Some Android.mk modules have transitive dependencies that must be specified when they are
+     depended upon (like android-support-v7-mediarouter requires android-support-v7-appcompat).
+     This may be specified multiple times to declare these dependencies.
+  <dir>
+     The directory to search for *.pom files under.
+
+The makefile is written to stdout, to be put in the current directory (often as Android.mk)
+`, os.Args[0])
+	}
+
+	flag.Var(&extraDeps, "extra-deps", "Extra dependencies needed when depending on a module")
+	flag.Var(&rewriteNames, "rewrite", "Regex(es) to rewrite artifact names")
+	flag.Parse()
+
+	if flag.NArg() != 1 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	dir := flag.Arg(0)
+	absDir, err := filepath.Abs(dir)
+	if err != nil {
+		fmt.Println(os.Stderr, "Failed to get absolute directory:", err)
+		os.Exit(1)
+	}
+
+	var filenames []string
+	err = filepath.Walk(absDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		name := info.Name()
+		if info.IsDir() {
+			if strings.HasPrefix(name, ".") {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if strings.HasPrefix(name, ".") {
+			return nil
+		}
+
+		if strings.HasSuffix(name, ".pom") {
+			path, err = filepath.Rel(absDir, path)
+			if err != nil {
+				return err
+			}
+			filenames = append(filenames, filepath.Join(dir, path))
+		}
+		return nil
+	})
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error walking files:", err)
+		os.Exit(1)
+	}
+
+	if len(filenames) == 0 {
+		fmt.Fprintln(os.Stderr, "Error: no *.pom files found under", dir)
+		os.Exit(1)
+	}
+
+	sort.Strings(filenames)
+
+	fmt.Println("# Automatically generated with:")
+	fmt.Println("# pom2mk", strings.Join(proptools.ShellEscape(os.Args[1:]), " "))
+	fmt.Println("LOCAL_PATH := $(call my-dir)")
+
+	for _, filename := range filenames {
+		err := convert(filename, os.Stdout)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "Error converting", filename, err)
+			os.Exit(1)
+		}
+	}
+}