admin/clang-format.sh

   1 #!/bin/bash
   2 #
   3 # This file is part of the GROMACS molecular simulation package.
   4 #
   5 # Copyright (c) 2019, by the GROMACS development team, led by
   6 # Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
   7 # and including many others, as listed in the AUTHORS file in the
   8 # top-level source directory and at http://www.gromacs.org.
   9 #
  10 # GROMACS is free software; you can redistribute it and/or
  11 # modify it under the terms of the GNU Lesser General Public License
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  32 #
  33 # To help us fund GROMACS development, we humbly ask that you cite
  34 # the research papers on the package. Check out http://www.gromacs.org.
  35
  36 # This script runs clang format and copyright header checks on modified files and
  37 # reports/applies the necessary changes.
  38 #
  39 # See `clang-format.sh -h` for a brief usage, and docs/dev-manual/code-formatting.rst
  40 # for more details.
  41
  42 # Parse command-line arguments
  43 function usage() {
  44     echo "usage: clang-format.sh [-f|--force] [--rev=REV]"
  45     echo "           [--format=(off|check)]"
  46     echo "           [--warnings=<file>] [<action>]"
  47     echo "<action>: (check*|diff|update)[-(index|workdir*)] (*=default)"
  48 }
  49
  50 action="check-workdir"
  51 declare -a diffargs
  52 baserev="HEAD"
  53 force=
  54 format_mode=check
  55 warning_file=
  56 for arg in "$@" ; do
  57     if [[ "$arg" == "check-index" || "$arg" == "check-workdir" || \
  58           "$arg" == "diff-index" || "$arg" == "diff-workdir" || \
  59           "$arg" == "update-index" || "$arg" == "update-workdir" ]]
  60     then
  61         action=$arg
  62     elif [[ "$arg" == "check" || "$arg" == "diff" || "$arg" == "update" ]] ; then
  63         action=$arg-workdir
  64     elif [[ "$action" == diff-* ]] ; then
  65         diffargs+=("$arg")
  66     elif [[ "$arg" == --format=* ]] ; then
  67         format_mode=${arg#--format=}
  68         if [[ "$format_mode" != "off" && "$format_mode" != "check" ]] ; then
  69             echo "Unknown option: $arg"
  70             echo
  71             usage
  72             exit 2
  73         fi
  74     elif [[ "$arg" == "-f" || "$arg" == "--force" ]] ; then
  75         force=1
  76     elif [[ "$arg" == --rev=* ]] ; then
  77         baserev=${arg#--rev=}
  78     elif [[ "$arg" == --warnings=* ]] ; then
  79         warning_file=${arg#--warnings=}
  80     elif [[ "$arg" == "-h" || "$arg" == "--help" ]] ; then
  81         usage
  82         exit 0
  83     else
  84         echo "Unknown option: $arg"
  85         echo
  86         usage
  87         exit 2
  88     fi
  89 done
  90
  91 # Check that format is present
  92 if [[ "$format_mode" != "off" ]]
  93 then
  94     if [ -z "$CLANG_FORMAT" ]
  95     then
  96         CLANG_FORMAT=`git config hooks.clangformatpath`
  97     fi
  98     if [ -z "$CLANG_FORMAT" ]
  99     then
 100         echo "Please set the path to clang-format using the git hook"
 101         echo "git config hooks.clang_formatpath /path/to/clang-format"
 102         echo "or by setting an environment variable, e.g."
 103         echo "CLANG_FORMAT=/path/to/clang-format"
 104         echo "See docs/dev-manual/code-formatting.rst for how to get clang-format."
 105         exit 2
 106     fi
 107     if ! which "$CLANG_FORMAT" 1>/dev/null
 108     then
 109         echo "clang-format not found: $CLANG_FORMAT"
 110         exit 2
 111     fi
 112 fi
 113
 114 # Switch to the root of the source tree and check the config file
 115 srcdir=`git rev-parse --show-toplevel`
 116 pushd $srcdir >/dev/null
 117 admin_dir=$srcdir/admin
 118
 119 # Actual processing starts: create a temporary directory
 120 tmpdir=`mktemp -d -t gmxclangformat.XXXXXX`
 121
 122 # Produce a list of changed files
 123 # Only include files that have proper filter set in .gitattributes
 124 internal_diff_args=
 125 if [[ $action == *-index ]]
 126 then
 127     internal_diff_args="--cached"
 128 fi
 129 git diff-index $internal_diff_args --diff-filter=ACMR $baserev >$tmpdir/difflist
 130 cut -f2 <$tmpdir/difflist | \
 131     git check-attr --stdin filter | \
 132     sed -e 's/.*: filter: //' | \
 133     paste $tmpdir/difflist - | \
 134     grep -E '(complete_formatting|clangformat|copyright|includesort)$' >$tmpdir/filtered
 135 cut -f2 <$tmpdir/filtered >$tmpdir/filelist_all
 136 grep -E '(complete_formatting|clangformat)$' <$tmpdir/filtered | \
 137     cut -f2 >$tmpdir/filelist_clangformat
 138 git diff-files --name-only | grep -Ff $tmpdir/filelist_all >$tmpdir/localmods
 139
 140 # Extract changed files to a temporary directory
 141 mkdir $tmpdir/org
 142 if [[ $action == *-index ]] ; then
 143     git checkout-index --prefix=$tmpdir/org/ --stdin <$tmpdir/filelist_all
 144 else
 145     rsync --files-from=$tmpdir/filelist_all $srcdir $tmpdir/org
 146 fi
 147 # Need to have .clang-format file available somewhere above where we are using it
 148 rsync $srcdir/.clang-format $tmpdir/
 149 # Duplicate the original files to a separate directory, where all changes will
 150 # be made.
 151 cp -r $tmpdir/org $tmpdir/new
 152
 153 # Create output file for what was done (in case no messages get written)
 154 touch $tmpdir/messages
 155
 156 # Run clang-format on the temporary directory
 157 # Can only perform clang format on a non-empty list of files
 158 cd $tmpdir/new
 159 if [[ $format_mode != "off" &&  -s $tmpdir/filelist_clangformat ]] ; then
 160     $CLANG_FORMAT -i `cat $tmpdir/filelist_clangformat` >$tmpdir/clang-format.out 2>&1
 161     if [ -s $tmpdir/clang-format.out ]; then
 162         echo "Reformatting failed. Check format output below for errors:"
 163         cat $tmpdir/clang-format.out
 164         rm -rf $tmpdir
 165         exit 2
 166     fi
 167     # Find the changed files if necessary
 168     if [[ $action != diff-* ]] ; then
 169         msg="needs formatting"
 170         if [[ $action == update-* ]] ; then
 171             msg="clang-format performed"
 172         fi
 173         git diff --no-index --name-only ../org/ . | \
 174             awk -v msg="$msg" '{sub(/.\//,""); print $0 ": " msg}' >> $tmpdir/messages
 175     fi
 176     # TODO: Consider checking whether rerunning clang-format causes additional changes
 177 fi
 178
 179 cd $tmpdir
 180
 181 # If a diff was requested, show it and we are done
 182 if [[ $action == diff-* ]] ; then
 183     git diff --no-index --no-prefix "${diffargs[@]}" org/ new/
 184     rm -rf $tmpdir
 185     exit 0
 186 fi
 187
 188 # Find the changed files
 189 git diff --no-index --name-only --exit-code org/ new/ | \
 190     sed -e 's#new/##' > $tmpdir/changed
 191 changes=
 192 if [[ -s $tmpdir/changed ]]
 193 then
 194     changes=1
 195 fi
 196
 197 # Check if changed files have changed outside the index
 198 if grep -Ff $tmpdir/localmods $tmpdir/changed > $tmpdir/conflicts
 199 then
 200     awk '{print $0 ": has changes in work tree"}' $tmpdir/conflicts \
 201         >> $tmpdir/messages
 202     if [[ ! $force && $action == update-* ]] ; then
 203         echo "Modified files found in work tree, skipping update. Use -f to override."
 204         echo "The following would have been done:"
 205         sort $tmpdir/messages
 206         rm -rf $tmpdir
 207         exit 2
 208     fi
 209 fi
 210
 211 # Update the index/work tree if requested
 212 if [[ $action == update-index ]] ; then
 213     grep -Ff $tmpdir/changed $tmpdir/filtered > $tmpdir/tohash
 214     cd $tmpdir/new
 215     IFS='
 216 '
 217     for change in `cut -f2 $tmpdir/tohash | \
 218                    git --git-dir=$srcdir/.git hash-object -w --stdin-paths --no-filters | \
 219                    paste - $tmpdir/tohash`
 220     do
 221         # NOTE: the patterns below contain literal tabs
 222         sha1=${change%% *}
 223         rest=${change#* }
 224         mode=${rest:8:6}
 225         path=${rest#*   }
 226         path=${path%%   *}
 227         # Contains a literal tab
 228         echo "$mode $sha1       $path" >> $tmpdir/toindex
 229     done
 230     unset IFS
 231     git --git-dir=$srcdir/.git update-index --index-info < $tmpdir/toindex
 232 elif [[ $action == update-workdir ]] ; then
 233     rsync --files-from=$tmpdir/changed $tmpdir/new/ $srcdir/
 234 fi
 235
 236 # Get back to the original directory
 237 popd >/dev/null
 238
 239 # Report what was done
 240 sort $tmpdir/messages | tee $warning_file
 241
 242 rm -rf $tmpdir
 243 exit $changes