Fixed coverage

.travis.yml

@@ -2,6 +2,6 @@ language: go
 go:
   - 1.9.2
 script:
+  - go get code.google.com/p/go.tools/cmd/cover
   - go get github.com/mattn/goveralls
-  - go test -v -covermode=count -coverprofile=coverage.out ./...
-  - goveralls -coverprofile=coverage.out -service travis-ci -repotoken lhWzILT1WMRgrHXsEhauQOGsoby1nm7DR
+  - script/coverage --coveralls

coverage.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+# Generate test coverage statistics for Go packages.
+#
+# Works around the fact that `go test -coverprofile` currently does not work
+# with multiple packages, see https://code.google.com/p/go/issues/detail?id=6909
+#
+# Usage: script/coverage [--html|--coveralls]
+#
+#     --html      Additionally create HTML report and open it in browser
+#     --coveralls Push coverage statistics to coveralls.io
+#
+
+set -e
+
+workdir=.cover
+profile="$workdir/cover.out"
+mode=count
+
+generate_cover_data() {
+    rm -rf "$workdir"
+    mkdir "$workdir"
+
+    for pkg in "$@"; do
+        f="$workdir/$(echo $pkg | tr / -).cover"
+        go test -covermode="$mode" -coverprofile="$f" "$pkg"
+    done
+
+    echo "mode: $mode" >"$profile"
+    grep -h -v "^mode:" "$workdir"/*.cover >>"$profile"
+}
+
+show_cover_report() {
+    go tool cover -${1}="$profile"
+}
+
+push_to_coveralls() {
+    echo "Pushing coverage statistics to coveralls.io"
+    goveralls -coverprofile="$profile" -repotoken lhWzILT1WMRgrHXsEhauQOGsoby1nm7DR
+}
+
+generate_cover_data $(go list ./...)
+show_cover_report func
+case "$1" in
+"")
+    ;;
+--html)
+    show_cover_report html ;;
+--coveralls)
+    push_to_coveralls ;;
+*)
+    echo >&2 "error: invalid option: $1"; exit 1 ;;
+esac