scripts: Rewrite lint scripts

Rewrite lint scripts to report what they do and if they pass. In the
case they fail list the files that caused the failure, except for
clang-format, which will be slow to run of every file individually
(should just run `make fmt` anyway). Also add a script to run all the
lints in order with a single command.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

scripts/lint/02-clang-format.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-only
+
+# Check if any C files or headers need to be formatted.
+
+LINT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
+. "$LINT_DIR/util.sh"
+
+echo -n "Checking C style..."
+
+if ! command -v clang-format > /dev/null; then
+    skipped "clang-format not found"
+    exit 0
+fi
+
+readarray -t FILES < <(git ls-files '*.c' '*.h')
+
+FMT_OPTS=(
+    "-style=file"
+    "--fallback-style=none"
+    "--dry-run"
+    "--Werror"
+)
+
+# NOTE: It is too slow to run clang-format on every file individually to report
+# which ones fail. Leave it up to the user to apply formatting via `make fmt`.
+
+_output=$(clang-format "${FMT_OPTS[@]}" "${FILES[@]}" 2>&1)
+if [[ $_output != "" ]]; then
+    failed
+    exit 1
+fi
+
+passed