Add gomate

a simple tool to tidy go modules and update deps

Signed-off-by: Marcus Brandenburger <bur@zurich.ibm.com>

Author: mbrandenburger

Makefile

@@ -46,6 +46,9 @@ gotools:
 godeps: gotools
 	$(GO) mod download
 
+gotidy:
+	./scripts/gomate.sh tidy
+
 fpc-sdk: godeps
 	$(foreach DIR, $(FPC_SDK_DEP_DIRS), $(MAKE) -C $(DIR) build || exit;)
 

scripts/gomate.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+#
+# Copyright IBM Corp. All Rights Reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+set -euo pipefail
+
+# lint me: shfmt -i 2 -ci -l -w
+
+IFS=$'\t\n' # Split on newlines and tabs (but not on spaces)
+script_name=$(basename "${0}")
+script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+readonly script_name script_dir
+
+readonly repo_dir="$(pwd)"
+
+# how to use this script
+function usage() {
+  cli_name=${0##*/}
+  echo "gomate helps to manage multiple go modules in a single repository.
+Usage: $cli_name [command]
+Commands:
+  initwork      creates go workspace for this project (\`go work init\` and \`go work use\` everywhere)
+  tidy          runs \`go mod tidy\` everywhere
+  update [XYZ]  updates a specific dep (\`go get XYZ\`) everywhere; if no dep argument given, \`go get -u\` is called
+  help          shows this help
+  "
+  exit 1
+}
+
+# create go work init
+function init_work() {
+  echo "go work init"
+  go work init
+  find "$repo_dir" -iname "go.mod" -exec dirname {} \; | xargs go work use
+}
+
+# update deps; take as parameter the dependency to update; if empty all deps are updates
+function update() {
+  if [[ -z $1 ]]; then
+    # check all update
+    echo "go get -u everywhere"
+    find "$repo_dir" -iname "go.mod" -execdir sh -c "go get -u" \;
+  else
+    # check a specific dep
+    echo "go get $1 everywhere"
+    find "$repo_dir" -iname "go.mod" -execdir sh -c "go get $1" \;
+  fi
+}
+
+# run go mod tidy everywhere
+function tidy() {
+  echo "go mod tidy everywhere"
+  find "$repo_dir" -iname "go.mod" -execdir sh -c "go mod tidy" \;
+}
+
+main() {
+  case "${1-""}" in
+    initwork)
+      init_work
+      ;;
+    tidy)
+      tidy
+      ;;
+    update)
+      update "${2-""}"
+      ;;
+    *)
+      usage
+      ;;
+  esac
+}
+
+main "${@}"