ci: add install script workflow (#7159)

* ci: add install script workflow

Add GitHub Actions workflow to test install.sh script.

This prevents regressions like the one reported in issue #7133 where
changes to the install script broke the recommended installation method.

The workflow includes:
- shellcheck for script linting (temporarily excludes SC3045)
- Integration test using curl piped to sh as documented on starship.rs

Signed-off-by: cappyzawa <cappyzawa@gmail.com>

* fixup! ci: add install script workflow

Signed-off-by: cappyzawa <cappyzawa@gmail.com>

* fixup! ci: add install script workflow

Signed-off-by: cappyzawa <cappyzawa@gmail.com>

* ci: add shfmt check and format install scripts

Add shfmt job to install-script workflow for consistent shell script
formatting. Apply shfmt to all scripts under install/ directory.

Signed-off-by: cappyzawa <cappyzawa@gmail.com>

---------

Signed-off-by: cappyzawa <cappyzawa@gmail.com>

.github/workflows/install-script.yml

@@ -0,0 +1,52 @@
+name: Install Script
+on:
+  push:
+    paths:
+      - "install/**"
+  pull_request:
+    paths:
+      - "install/**"
+
+jobs:
+  shellcheck:
+    name: Shellcheck [Linter]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup | Checkout
+        uses: actions/checkout@v6
+
+      - name: Lint | Run shellcheck
+        run: shellcheck --severity=warning install/**/*.sh
+
+  shfmt:
+    name: Shfmt [Formatter]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup | Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup | Install shfmt
+        run: |
+          curl -sS https://webi.sh/shfmt | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
+      - name: Format | Check shfmt
+        run: shfmt -d install/**/*.sh
+
+  test_install_script:
+    name: Test Install Script
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Setup | Checkout
+        uses: actions/checkout@v6
+
+      - name: Test | Piped execution with curl
+        run: |
+          # Test the installation method described at https://starship.rs/
+          mkdir -p "$HOME/.test-install"
+          curl -sS "file://$(pwd)/install/install.sh" | sh -s -- --yes --bin-dir "$HOME/.test-install"
+          "$HOME/.test-install/starship" --version

install/install.sh

@@ -209,7 +209,7 @@ detect_platform() {
 
 	case "${platform}" in
 	msys_nt*) platform="pc-windows-msvc" ;;
-    cygwin_nt*) platform="pc-windows-msvc";;
+	cygwin_nt*) platform="pc-windows-msvc" ;;
 	# mingw is Git-Bash
 	mingw*) platform="pc-windows-msvc" ;;
 	# use the statically compiled musl bins on linux to avoid linking issues.
@@ -257,7 +257,6 @@ detect_target() {
 	printf '%s' "${target}"
 }
 
-
 confirm() {
 	if [ -z "${FORCE-}" ]; then
 		printf "%s " "${MAGENTA}?${NO_COLOR} $* ${BOLD}[y/N]${NO_COLOR}"
@@ -305,28 +304,27 @@ check_bin_dir() {
 print_install() {
 	# if the shell does not fit the default case change the config file
 	# and or the config cmd variable
-  for s in "bash" "zsh" "ion" "tcsh" "xonsh" "fish"
-  do
+	for s in "bash" "zsh" "ion" "tcsh" "xonsh" "fish"; do
 		# shellcheck disable=SC2088
 		# we don't want these '~' expanding
 		config_file="~/.${s}rc"
 		config_cmd="eval \"\$(starship init ${s})\""
 
 		case ${s} in
-      ion )
+		ion)
 			# shellcheck disable=SC2088
 			config_file="~/.config/ion/initrc"
 			config_cmd="eval \$(starship init ${s})"
 			;;
-      fish )
+		fish)
 			# shellcheck disable=SC2088
 			config_file="~/.config/fish/config.fish"
 			config_cmd="starship init fish | source"
 			;;
-      tcsh )
+		tcsh)
 			config_cmd="eval \`starship init ${s}\`"
 			;;
-      xonsh )
+		xonsh)
 			config_cmd="execx(\$(starship init xonsh))"
 			;;
 		esac
@@ -337,18 +335,17 @@ print_install() {
 			"${config_cmd}"
 	done
 
-  for s in "elvish" "nushell"
-  do
+	for s in "elvish" "nushell"; do
 
 		warning="${BOLD}Warning${NO_COLOR}"
 		case ${s} in
-      elvish )
+		elvish)
 			# shellcheck disable=SC2088
 			config_file="~/.config/elvish/rc.elv"
 			config_cmd="eval (starship init elvish)"
 			warning="${warning} Only elvish v0.17 or higher is supported."
 			;;
-      nushell )
+		nushell)
 			# shellcheck disable=SC2088
 			config_file="${BOLD}your nu config file${NO_COLOR} (find it by running ${BOLD}\$nu.config-path${NO_COLOR} in Nushell)"
 			config_cmd="mkdir (\$nu.data-dir | path join \"vendor/autoload\")

install/macos_packages/common.sh

@@ -21,10 +21,10 @@ starship_version() {
 	if [ "$STARSHIP_VERSION" != "" ]; then
 		echo "$STARSHIP_VERSION" | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+'
 	elif "$starship_program_file" -V >/dev/null 2>&1; then
-    "$starship_program_file" -V 2> /dev/null | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+'
+		"$starship_program_file" -V 2>/dev/null | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+'
 	else
-    pushd "$(git rev-parse --show-toplevel)" &> /dev/null || true
+		pushd "$(git rev-parse --show-toplevel)" &>/dev/null || true
 		grep '^version = \"\(.*\)\"' Cargo.toml | head -n 1 | cut -f 2 -d '"' | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+'
-    popd &> /dev/null || true
+		popd &>/dev/null || true
 	fi
 }