Add support for excoveralls json format

Makefile

@@ -1,4 +1,4 @@
-.PHONY: test-docker build-docker build-all build-all-latest release
+.PHONY: test-docker build-docker build-all build-all-latest release test-excoveralls
 
 AWS ?= $(shell which aws)
 DOCKER_RUN ?= $(shell which docker) run --rm
@@ -71,6 +71,9 @@ test-clover:
 test-cobertura:
 	docker build -f integration-tests/cobertura/Dockerfile .
 
+test-excoveralls:
+	docker build -f integration-tests/excoveralls/Dockerfile .
+
 publish-head:
 	$(AWS) s3 cp \
 	  --acl public-read \

cmd/format-coverage.go

@@ -11,6 +11,7 @@ import (
 	"github.com/codeclimate/test-reporter/formatters/clover"
 	"github.com/codeclimate/test-reporter/formatters/cobertura"
 	"github.com/codeclimate/test-reporter/formatters/coveragepy"
+	"github.com/codeclimate/test-reporter/formatters/excoveralls"
 	"github.com/codeclimate/test-reporter/formatters/gcov"
 	"github.com/codeclimate/test-reporter/formatters/gocov"
 	"github.com/codeclimate/test-reporter/formatters/jacoco"
@@ -34,18 +35,19 @@ type CoverageFormatter struct {
 var formatOptions = CoverageFormatter{}
 
 // a prioritized list of the formatters to use
-var formatterList = []string{"simplecov", "lcov", "coverage.py", "clover", "gocov", "gcov", "cobertura", "jacoco"}
+var formatterList = []string{"clover", "cobertura", "coverage.py", "excoveralls", "gcov", "gocov", "jacoco", "lcov", "simplecov"}
 
 // a map of the formatters to use
 var formatterMap = map[string]formatters.Formatter{
-	"simplecov":   &simplecov.Formatter{},
-	"lcov":        &lcov.Formatter{},
-	"coverage.py": &coveragepy.Formatter{},
-	"gocov":       &gocov.Formatter{},
 	"clover":      &clover.Formatter{},
 	"cobertura":   &cobertura.Formatter{},
+	"coverage.py": &coveragepy.Formatter{},
+	"excoveralls": &excoveralls.Formatter{},
 	"gcov":        &gcov.Formatter{},
+	"gocov":       &gocov.Formatter{},
 	"jacoco":      &jacoco.Formatter{},
+	"lcov":        &lcov.Formatter{},
+	"simplecov":   &simplecov.Formatter{},
 }
 
 // formatCoverageCmd represents the format command

formatters/excoveralls/excoveralls.go

@@ -0,0 +1,73 @@
+package excoveralls
+
+import (
+	"encoding/json"
+	"os"
+	"strings"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/codeclimate/test-reporter/env"
+	"github.com/codeclimate/test-reporter/formatters"
+	"github.com/pkg/errors"
+)
+
+var searchPaths = []string{"cover/excoveralls.json"}
+
+type Formatter struct {
+	Path string
+}
+
+func (f *Formatter) Search(paths ...string) (string, error) {
+	paths = append(paths, searchPaths...)
+	for _, p := range paths {
+		logrus.Debugf("checking search path %s for excoveralls formatter", p)
+		if _, err := os.Stat(p); err == nil {
+			f.Path = p
+			return p, nil
+		}
+	}
+
+	return "", errors.WithStack(errors.Errorf("could not find any files in search paths for excoveralls. search paths were: %s", strings.Join(paths, ", ")))
+}
+
+func (r Formatter) Format() (formatters.Report, error) {
+	report, err := formatters.NewReport()
+	if err != nil {
+		return report, err
+	}
+
+	inputFile, err := os.Open(r.Path)
+	if err != nil {
+		return report, errors.WithStack(errors.Errorf("could not open coverage file %s", r.Path))
+	}
+
+	coverageInput := &jsonExcoveralls{}
+	err = json.NewDecoder(inputFile).Decode(&coverageInput)
+	if err != nil {
+		return report, errors.WithStack(err)
+	}
+
+	gitHead, _ := env.GetHead()
+	for _, file := range coverageInput.Files {
+		sourceFile, err := formatters.NewSourceFile(file.Name, gitHead)
+		if err != nil {
+			return report, errors.WithStack(err)
+		}
+		sourceFile.Coverage = file.Coverage
+		err = report.AddSourceFile(sourceFile)
+		if err != nil {
+			return report, errors.WithStack(err)
+		}
+	}
+
+	return report, nil
+}
+
+type jsonSourceFile struct {
+	Name     string              `json:"name,attr"`
+	Coverage []formatters.NullInt `json:"coverage,attr"`
+}
+
+type jsonExcoveralls struct {
+	Files []jsonSourceFile `json:"source_files"`
+}

formatters/excoveralls/excoveralls_example.json

@@ -0,0 +1,12 @@
+{
+  "source_files":[
+    {
+      "name":"demo-app/services/create_user.ex",
+      "coverage":[null,null,null,1,null,null,null,null,null,1,null,1,null,null,1,null,null,1,null,0,null,null]
+    },
+    {
+      "name":"demo-app/services/update_user_info.ex",
+      "coverage":[null,null,null,1,null,null,1,1,null,1,null,null,1,null,null,1,1,null,null,1,null,1,null,null]
+    }
+  ]
+}

formatters/excoveralls/excoveralls_test.go

@@ -0,0 +1,57 @@
+package excoveralls
+
+import (
+	"testing"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/object"
+
+	"github.com/codeclimate/test-reporter/env"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Format(t *testing.T) {
+	gb := env.GitBlob
+	defer func() { env.GitBlob = gb }()
+	env.GitBlob = func(s string, c *object.Commit) (string, error) {
+		return s, nil
+	}
+
+	r := require.New(t)
+
+	rb := Formatter{
+		Path: "./excoveralls_example.json",
+	}
+	rep, err := rb.Format()
+	r.NoError(err)
+
+	r.InDelta(93.3, rep.CoveredPercent, 1)
+
+	sf := rep.SourceFiles["demo-app/services/update_user_info.ex"]
+	r.InDelta(100, sf.CoveredPercent, 1)
+	sfLc := sf.LineCounts
+	r.Equal(sfLc.Covered, 9)
+	r.Equal(sfLc.Missed, 0)
+	r.Equal(sfLc.Total, 9)
+
+	lc := rep.LineCounts
+	r.Equal(lc.Covered, 14)
+	r.Equal(lc.Missed, 1)
+	r.Equal(lc.Total, 15)
+}
+
+func Test_Format_MissingFile(t *testing.T) {
+	gb := env.GitBlob
+	defer func() { env.GitBlob = gb }()
+	env.GitBlob = func(s string, c *object.Commit) (string, error) {
+		return s, nil
+	}
+
+	r := require.New(t)
+
+	rb := Formatter{
+		Path: "./not_real.json",
+	}
+	_, err := rb.Format()
+	r.Error(err)
+	r.Equal("could not open coverage file ./not_real.json", err.Error())
+}

integration-tests/excoveralls/Dockerfile

@@ -0,0 +1,35 @@
+FROM elixir:1.4.2
+
+RUN curl -O https://storage.googleapis.com/golang/go1.8.linux-amd64.tar.gz
+RUN tar -xvf go1.8.linux-amd64.tar.gz
+RUN mv go /usr/local
+
+ENV PATH $PATH:/usr/local/go/bin
+RUN go version
+
+ENV GOPATH /go
+RUN mkdir $GOPATH
+ENV PATH $PATH:/go/bin
+
+ENV CCTR=$GOPATH/src/github.com/codeclimate/test-reporter
+RUN mkdir -p $CCTR
+WORKDIR $CCTR
+COPY . .
+RUN go install -v
+
+# RUN git clone https://github.com/ale7714/excoveralls.git
+RUN git clone https://github.com/codeclimate-testing/excoveralls.git
+WORKDIR excoveralls
+
+RUN echo "testing" > ignore.me
+RUN git config --global user.email "[email protected]"
+RUN git config --global user.name "Your Name"
+RUN git add ignore.me
+RUN git commit -m "testing"
+ENV MIX_ENV=test
+RUN mix do local.hex --force, local.rebar --force, deps.get, compile, coveralls.json
+
+
+ENV CC_TEST_REPORTER_ID=f611556edda9a27a3faace9b837185944ada203dfca1ec3242a4d0a35162f9fc
+
+RUN test-reporter after-build -s 2 -d