fix: force basename/dirname to treat $0 as an argument (#1132)

* fix: basename: force $0 to be treated as argument

* fix: dirname: force $0 to be treated as argument

.husky/commit-msg

@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
-. "$(dirname "$0")/_/husky.sh"
+. "$(dirname -- "$0")/_/husky.sh"
 
 npx --no-install commitlint --edit "$1"

.husky/pre-commit

@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
-. "$(dirname "$0")/_/husky.sh"
+. "$(dirname -- "$0")/_/husky.sh"
 
 npm test

docs/README.md

@@ -406,8 +406,8 @@ fi
 
 ```shell
 #!/usr/bin/env sh
-. "$(dirname "$0")/_/husky.sh"
-. "$(dirname "$0")/common.sh"
+. "$(dirname -- "$0")/_/husky.sh"
+. "$(dirname -- "$0")/common.sh"
 
 yarn ...
 ```

husky.sh

@@ -6,7 +6,7 @@ if [ -z "$husky_skip_init" ]; then
     fi
   }
 
-  readonly hook_name="$(basename "$0")"
+  readonly hook_name="$(basename -- "$0")"
   debug "starting $hook_name..."
 
   if [ "$HUSKY" = "0" ]; then

src/index.ts

@@ -64,7 +64,7 @@ export function set(file: string, cmd: string): void {
   fs.writeFileSync(
     file,
     `#!/usr/bin/env sh
-. "$(dirname "$0")/_/husky.sh"
+. "$(dirname -- "$0")/_/husky.sh"
 
 ${cmd}
 `,

test/1_default.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 install
 

test/2_in-sub-dir.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 install
 

test/3_from-sub-dir.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 
 # Example:

test/4_not-git-dir.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 install
 

test/5_set-add.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 install
 

test/6_git_command_not_found.sh

@@ -1,4 +1,4 @@
-. "$(dirname "$0")/functions.sh"
+. "$(dirname -- "$0")/functions.sh"
 setup
 install
 

test/functions.sh

@@ -2,7 +2,7 @@
 set -eu
 
 setup() {
-  name="$(basename $0)"
+  name="$(basename -- $0)"
   testDir="/tmp/husky-test-$name"
   echo
   echo "-------------------"