Adding scripts to run linting on only modified files (#3192)

Makefile

@@ -295,7 +295,9 @@ lint:
 
 lint-fix:
 	golangci-lint run --fix --out-format=tab --issues-exit-code=0
-.PHONY: lint lint-fix
+
+lint-fix-changed:
+	./scripts/linting/lint-changed-go-files.sh
 
 format:
 	find . -name '*.go' -type f -not -path "./vendor*" -not -path "*.git*" -not -path "./docs/client/statik/statik.go" -not -path "./tests/mocks/*" -not -name '*.pb.go' -not -name '*.pb.gw.go' | xargs gofumpt -w
@@ -305,6 +307,11 @@ format:
 docs-lint:
 	markdownlint . --fix
 
+docs-lint-changed:
+	./scripts/linting/lint-changed-md-files.sh
+
+.PHONY: lint lint-fix lint-fix-changed docs-lint docs-lint-changed
+
 ###############################################################################
 ###                                Protobuf                                 ###
 ###############################################################################

scripts/linting/lint-changed-go-files.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# lint_modified_go_files runs the linter only if changes have been made to any go files.
+function lint_modified_go_files() {
+  local go_files="$(git diff --name-only | grep \.go$)"
+  for f in $go_files; do
+    golangci-lint run "${f}" --fix --out-format=tab --issues-exit-code=0
+  done
+}
+
+lint_modified_go_files

scripts/linting/lint-changed-md-files.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# lint_modified_markdown_files runs the linter only if changes have been made to any md files.
+function lint_modified_markdown_files() {
+  local markdown_files="$(git diff --name-only | grep \.md$)"
+  for f in $markdown_files; do
+    markdownlint "${f}" --fix
+  done
+}
+
+lint_modified_markdown_files