DataBindingが原因のビルドエラー時にエラーを抽出するスクリプト

AndroidでDataBinding周りミスるとめっちゃエラー出て辛いですね。辛いのでDataBindingのエラーを抽出するスクリプトを書きました。スクリプトはかなり雑なので適宜いい感じにしてください。

extract_data_binding_error.rb

#! /bin/sh
exec ruby -S -x "$0" "$@"
#! ruby

state = 0
while str = STDIN.gets
  break if str.chomp == "exit"
  case state
  when 0
    state = 1 if str.match(/.*Found data binding errors.*/)
  when 1
    state = 2 if str.match(/.*e: .*/)
    next if state == 2
    print str
  end
end

gradleのコマンドに2>&1を足してextract_data_binding_error.rbに流せばok

$ ./gradlew assembleDebug 2>&1 | ./extract_data_binding_error.rb
Identifiers must have user defined types from the XML file. user is missing it
file:///hoge/foo/git/android-app/app/src/main/res/layout/list_item_comment.xml Line:60


    at android.databinding.tool.processing.Scope.assertNoError(Scope.java:110)
    at android.databinding.annotationprocessor.ProcessDataBinding.process(ProcessDataBinding.java:89)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
    at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:73)
    ... 50 more

こんな感じ。やったね