s/gofmt/goimports/

goimports is a superset of gofmt.  It does everything gofmt does, and
also organizes package imports.

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 ## Coding Guidelines
 
 * In general, we follow [effective_go](https://golang.org/doc/effective_go.html)
-* Code must adhere to the official [Go formatting guidelines](https://golang.org/doc/effective_go.html#formatting) (i.e. uses [gofmt](https://golang.org/cmd/gofmt/)).
+* Code must adhere to the official [Go formatting guidelines](https://golang.org/doc/effective_go.html#formatting) (i.e. uses [goimports](https://godoc.org/golang.org/x/tools/cmd/goimports)).
 * Code must be documented adhering to the official Go [commentary](https://golang.org/doc/effective_go.html#commentary) guidelines.
 
 ## Pull Request (PR)
@@ -13,7 +13,7 @@ This [github document](https://help.github.com/articles/creating-a-pull-request/
 ## PR requirement
 To pursue engineering excellence, we have insisted on the highest stardard on the quality of each PR.
 
-* For each PR, please run [golint](https://github.com/golang/lint), [gofmt](https://golang.org/cmd/gofmt/), to fix the basic issues/warnings.
+* For each PR, please run [golint](https://github.com/golang/lint), [goimports](https://godoc.org/golang.org/x/tools/cmd/goimports), to fix the basic issues/warnings.
 * Make sure you understand [How to Write a Git Commit Message](https://chris.beams.io/posts/git-commit/).
 * Add a [Test] section in every PR detailing on your test process and results. If the test log is too long, please include a link to [gist](https://gist.github.com/) and add the link to the PR.
 

scripts/travis_checker.sh

@@ -12,7 +12,7 @@ print_file() {
 	echo "--- END ${2} ---"
 }
 
-unset -v ok tmpdir go_files go_dirs gofmt_output golint_output
+unset -v ok tmpdir go_files go_dirs goimports_output golint_output
 ok=true
 tmpdir=
 trap 'case "${tmpdir}" in ?*) rm -rf "${tmpdir}";; esac' EXIT
@@ -56,16 +56,16 @@ else
 	ok=false
 fi
 
-echo "Running gofmt..."
-gofmt_output="${tmpdir}/gofmt_output.txt"
-xargs gofmt -d -e < "${go_files}" > "${gofmt_output}" 2>&1
-if [ -s "${gofmt_output}" ]
+echo "Running goimports..."
+goimports_output="${tmpdir}/goimports_output.txt"
+xargs goimports -d -e < "${go_files}" > "${goimports_output}" 2>&1
+if [ -s "${goimports_output}" ]
 then
-	echo "gofmt FAILED!"
-	print_file "${gofmt_output}" "gofmt"
+	echo "goimports FAILED!"
+	print_file "${goimports_output}" "goimports"
 	ok=false
 else
-	echo "gofmt passed."
+	echo "goimports passed."
 fi
 
 if ! ${ok}