cppcheck.chevre

#!/bin/bash

# cppcheck is slow, so a source that has not changed since it last passed is
# not checked again. What passed is remembered in a file of the plugin's own
# rather than in build/hashes: passing cppcheck is not the same thing as
# having been compiled, and the options cppcheck was given are part of what
# passed.

CHECKED=build/cppcheck

options="$(echo "$@" | jq -r .options | not is_null)"

# What passed last time, as long as it passed with the options in use now.
checked_before()
{
	if [[ -f "$CHECKED" ]] && [[ "$(head -n 1 "$CHECKED")" == "$options" ]]; then
		tail -n +2 "$CHECKED"
	fi
}

hashes="$(all_sources | map generate_hash | sort)"

if [[ -z "$hashes" ]]; then
	exit 0
fi

sources="$(echo "$hashes" | diff -u - <(checked_before | sort) | filter new_hash | map hash_name)"

if [[ -z "$sources" ]]; then
	exit 0
fi

verbose cppcheck --error-exitcode=1 "$options" $sources

# Only once everything has passed. A source that failed is never recorded, so
# it is checked again on the next build.
{
	echo "$options"
	echo "$hashes"
} > "$CHECKED"