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Improve our clang-format.sh script

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Previously, this script ran over every C file in our source code,
which took up to a minute on my desktop.

Instead, the script now has several modes that it can run in, to
minimize the time spent and improve useful output.  It should now be
suitable for everyday use and git hooks.  I hope.

I've also renamed this script, so that we can keep using it in the
future if we were to move to some tool other than clang-format.
This commit is contained in:
Nick Mathewson 2020-06-11 10:22:42 -04:00
parent 1797d05165
commit f3c82c86f9
2 changed files with 232 additions and 41 deletions
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41
scripts/maint/clang-format.sh
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@ -1,41 +0,0 @@
#!/bin/sh
# Copyright 2020, The Tor Project, Inc.
# See LICENSE for licensing information.
#
# DO NOT COMMIT OR MERGE CODE THAT IS RUN THROUGH THIS TOOL YET.
#
# WE ARE STILL DISCUSSING OUR DESIRED STYLE AND ITERATING ON IT.
# (12 Feb 2020)
#
# This script runs "clang-format" and "codetool" in sequence over each of
# our source files, and replaces the original file only if it has changed.
#
# We can't just use clang-format -i, since we also want to use codetool to
# reformat a few things back to how we want them, and we want avoid changing
# the mtime on files that didn't actually change.
set -e
cd "$(dirname "$0")/../../src/"
# Shellcheck complains that a for loop over find's output is unreliable,
# since there might be special characters in the output. But we happen
# to know that none of our C files have special characters or spaces in
# their names, so this is safe.
#
# shellcheck disable=SC2044
for fname in $(find lib core feature app test tools -name '[^.]*.[ch]'); do
tmpfname="${fname}.clang_fmt.tmp"
rm -f "${tmpfname}"
clang-format --style=file "${fname}" > "${tmpfname}"
../scripts/maint/codetool.py "${tmpfname}"
if cmp "${fname}" "${tmpfname}" >/dev/null 2>&1; then
echo "No change in ${fname}"
rm -f "${tmpfname}"
else
echo "Change in ${fname}"
mv "${tmpfname}" "${fname}"
fi
done

232
scripts/maint/code-format.sh Executable file
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@ -0,0 +1,232 @@
#!/usr/bin/env bash
# Copyright 2020, The Tor Project, Inc.
# See LICENSE for licensing information.
#
# DO NOT COMMIT OR MERGE CODE THAT IS RUN THROUGH THIS TOOL YET.
#
# WE ARE STILL DISCUSSING OUR DESIRED STYLE AND ITERATING ON IT.
# (12 Feb 2020)
#
# This script runs "clang-format" and "codetool" in sequence over each of its
# arguments. It either replaces the original, or says whether anything has
# changed, depending on its arguments.
#
# We can't just use clang-format directly, since we also want to use codetool
# to reformat a few things back to how we want them, and we want avoid changing
# the mtime on files that didn't actually change.
#
# Use "-i" to edit the file in-place.
# Use "-c" to exit with a nonzero exit status if any file needs to change.
# Use "-d" to emit diffs.
#
# The "-a" option tells us to run over every Tor source file.
# The "-v" option tells us to be verbose.
set -e
ALL=0
GITDIFF=0
GITIDX=0
DIFFMODE=0
CHECKMODE=0
CHANGEMODE=0
SCRIPT_NAME=$(basename "$0")
SCRIPT_DIR=$(dirname "$0")
SRC_DIR="${SCRIPT_DIR}/../../src"
function usage() {
echo "$SCRIPT_NAME [-h] [-c|-d|-i] [-v] [-a|-G|files...]"
echo
echo " flags:"
echo " -h: show this help text"
echo " -c: check whether files are correctly formatted"
echo " -d: print a diff for the changes that would be applied"
echo " -i: change files in-place"
echo " -a: run over all the C files in Tor"
echo " -v: verbose mode"
echo " -g: look at the files that have changed in git."
echo " -G: look at the files that are staged for the git commit."
echo
echo "EXAMPLES"
echo
echo " $SCRIPT_NAME -a -i"
echo " rewrite every file in place, whether it has changed or not."
echo " $SCRIPT_NAME -a -d"
echo " as above, but only display the changes."
echo " $SCRIPT_NAME -g -i"
echo " update every file that you have changed in the git working tree."
echo " $SCRIPT_NAME -G -c"
echo " exit with an error if any staged changes are not well-formatted."
}
FILEARGS_OK=1
while getopts "acdgGhiv" opt; do
case "$opt" in
h) usage
exit 0
;;
a) ALL=1
FILEARGS_OK=0
;;
g) GITDIFF=1
FILEARGS_OK=0
;;
G) GITIDX=1
FILEARGS_OK=0
;;
c) CHECKMODE=1
;;
d) DIFFMODE=1
;;
i) CHANGEMODE=1
;;
v) VERBOSE=1
;;
*) echo
usage
exit 1
;;
esac
done
# get rid of the flags; keep the filenames.
shift $((OPTIND - 1))
# Define a verbose function.
if [[ $VERBOSE = 1 ]]; then
function note()
{
echo "$@"
}
else
function note()
{
true
}
fi
# We have to be in at least one mode, or we can't do anything
if [[ $CHECKMODE = 0 && $DIFFMODE = 0 && $CHANGEMODE = 0 ]]; then
echo "Nothing to do. You need to specify -c, -d, or -i."
echo "Try $SCRIPT_NAME -h for more information."
exit 0
fi
# We don't want to "give an error if anything would change" if we're
# actually trying to change things.
if [[ $CHECKMODE = 1 && $CHANGEMODE = 1 ]]; then
echo "It doesn't make sense to use -c and -i together."
exit 0
fi
# It doesn't make sense to look at "all files" and "git files"
if [[ $((ALL + GITIDX + GITDIFF)) -gt 1 ]]; then
echo "It doesn't make sense to use more than one of -a, -g, or -G together."
exit 0
fi
if [[ $FILEARGS_OK = 1 ]]; then
# The filenames are on the command-line.
INPUTS=("${@}")
else
if [[ "$#" != 0 ]]; then
echo "Can't use -a, -g, or -G with additional command-line arguments."
exit 1
fi
fi
if [[ $ALL = 1 ]]; then
# We're in "all" mode -- use find(1) to find the filenames.
mapfile -d '' INPUTS < <(find "${SRC_DIR}"/{lib,core,feature,app,test,tools} -name '[^.]*.[ch]' -print0)
elif [[ $GITIDX = 1 ]]; then
# We're in "git index" mode -- use git diff --cached to find the filenames
# that are changing in the index, then strip out the ones that
# aren't C.
mapfile INPUTS < <(git diff --name-only --cached --diff-filter=AMCR | grep '\.[ch]$')
elif [[ $GITDIFF = 1 ]]; then
# We are in 'git diff' mode -- we want everything that changed, including
# the index and the working tree.
#
# TODO: There might be a better way to do this.
mapfile INPUTS < <(git diff --name-only --cached --diff-filter=AMCR | grep '\.[ch]$'; git diff --name-only --diff-filter=AMCR | grep '\.[ch]$' )
fi
if [[ $GITIDX = 1 ]]; then
# If we're running in git mode, we need to stash all the changes that
# we don't want to look at. This is necessary even though we're only
# looking at the changed files, since we might have the file only
# partially staged.
note "Stashing unstaged changes"
git stash -q --keep-index
function restoregit() {
note "Restoring git state"
git stash pop -q
}
else
function restoregit() {
true
}
fi
ANY_CHANGED=0
tmpfname=""
#
# Set up a trap handler to make sure that on exit, we remove our
# tmpfile and un-stash the git environment (if appropriate)
#
trap 'if [ -n "${tmpfname}" ]; then rm -f "${tmpfname}"; fi; restoregit' 0
for fname in "${INPUTS[@]}"; do
note "Inspecting $fname..."
tmpfname="${fname}.$$.clang_fmt.tmp"
rm -f "${tmpfname}"
clang-format --style=file "${fname}" > "${tmpfname}"
"${SCRIPT_DIR}/codetool.py" "${tmpfname}"
changed=not_set
if [[ $DIFFMODE = 1 ]]; then
# If we're running diff for its output, we can also use it
# to compare the files.
if diff -u "${fname}" "${tmpfname}"; then
changed=0
else
changed=1
fi
else
# We aren't running diff, so we have to compare the files with cmp.
if cmp "${fname}" "${tmpfname}" >/dev/null 2>&1; then
changed=0
else
changed=1
fi
fi
if [[ $changed = 1 ]]; then
note "Found a change in $fname"
ANY_CHANGED=1
if [[ $CHANGEMODE = 1 ]]; then
mv "${tmpfname}" "${fname}"
fi
fi
rm -f "${tmpfname}"
done
exitcode=0
if [[ $CHECKMODE = 1 ]]; then
if [[ $ANY_CHANGED = 1 ]]; then
note "Found at least one misformatted file; check failed"
exitcode=1
else
note "No changes found."
fi
fi
exit $exitcode