hgeditor

perf: use locally defined revlog option list for Mercurial earlier than 3.7

Before this patch, referring commands.debugrevlogopts prevents perf.py
from being loaded by Mercurial earlier than 3.7 (or 5606f7d0d063),
because it isn't available in such Mercurial, even though
cmdutil.openrevlog(), a user of these options, has been available
since 1.9 (or a79fea6b3e77).

In addition to it, there are some code paths for Mercurial earlier
than 3.7. For example, setting "_prereadsize" attribute in perfindex()
and perfnodelookup() is effective only with hg earlier than 1.8 (or
61c9bc3da402).

But just "using locally defined revlog option list" might cause
unexpected behavior at runtime. If --dir option is specified to
cmdutil.openrevlog() of Mercurial earlier than 3.5 (or 49c583ca48c4),
it is silently ignored without any warning or so.

  ============ ============ ===== ===============
                                  debugrevlogopts
  hg version   openrevlog() --dir of commands
  ============ ============ ===== ===============
  3.7 or later     o          o         o
  3.5 or later     o          o         x
  1.9 or later     o          x         x
  earlier          x          x         x
  ============ ============ ===== ===============

Therefore, this patch does:

  - use locally defined option list, if commands.debugrevlogopts isn't
    available (for Mercurial earlier than 3.7)

  - wrap cmdutil.openrevlog(), if it is ambiguous whether
    cmdutil.openrevlog() can recognize --dir option correctly
    (for Mercurial earlier than 3.5)

    This wrapper function aborts execution, if:
    - --dir option is specified, and
    - localrepository doesn't have "dirlog" attribute, which indicates
      that localrepository has a function for '--dir'

    BTW, extensions.wrapfunction() has been available since 1.1 (or
    0ab5f21c390b), and this seems old enough for "historical
    portability" of perf.py, which has been available since 1.1 (or
    eb240755386d).

#!/bin/sh
#
# This is an example of using HGEDITOR to create of diff to review the
# changes while committing.

# If you want to pass your favourite editor some other parameters
# only for Mercurial, modify this:
case "${EDITOR}" in
    "")
        EDITOR="vi"
        ;;
    emacs)
        EDITOR="$EDITOR -nw"
        ;;
    gvim|vim)
        EDITOR="$EDITOR -f -o"
        ;;
esac


HGTMP=""
cleanup_exit() {
    rm -rf "$HGTMP"
}

# Remove temporary files even if we get interrupted
trap "cleanup_exit" 0 # normal exit
trap "exit 255" HUP INT QUIT ABRT TERM

HGTMP=$(mktemp -d ${TMPDIR-/tmp}/hgeditor.XXXXXX)
[ x$HGTMP != x -a -d $HGTMP ] || {
  echo "Could not create temporary directory! Exiting." 1>&2
  exit 1
}

(
    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
        "$HG" diff "$changed" >> "$HGTMP/diff"
    done
)

cat "$1" > "$HGTMP/msg"

MD5=$(which md5sum 2>/dev/null) || \
    MD5=$(which md5 2>/dev/null)
[ -x "${MD5}" ] && CHECKSUM=`${MD5} "$HGTMP/msg"`
if [ -s "$HGTMP/diff" ]; then
    $EDITOR "$HGTMP/msg" "$HGTMP/diff" || exit $?
else
    $EDITOR "$HGTMP/msg" || exit $?
fi
[ -x "${MD5}" ] && (echo "$CHECKSUM" | ${MD5} -c >/dev/null 2>&1 && exit 13)

mv "$HGTMP/msg" "$1"

exit $?