Meta: Add lint-prettier.sh

This is a script similar to the clang-format one to ensure prettier
formatting of most JavaScript files.

1 files changed, 38 insertions, 0 deletions

diff --git a/Meta/lint-prettier.sh b/Meta/lint-prettier.sh
new file mode 100755
index 0000000000..3824232b64
--- /dev/null
+++ b/Meta/lint-prettier.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+set -e
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "${script_path}/.." || exit 1
+
+if ! command -v prettier >/dev/null 2>&1 ; then
+    echo "prettier is not available. Either skip this script, or install prettier."
+    exit 1
+fi
+
+if ! prettier --version | grep -qF '2.' ; then
+    echo "You are using '$(prettier --version)', which appears to not be prettier 2."
+    exit 1
+fi
+
+if [ "$#" -eq "0" ]; then
+    mapfile -t files < <(
+        git ls-files \
+            --exclude-from .prettierignore \
+            -- \
+            '*.js'
+    )
+else
+    files=()
+    for file in "$@"; do
+        if [[ "${file}" == *".js" ]]; then
+            files+=("${file}")
+        fi
+    done
+fi
+
+if (( ${#files[@]} )); then
+    prettier --check "${files[@]}"
+else
+    echo "No .js files to check."
+fi