view hgeditor @ 37126:4bd73a955ab0

thirdparty: vendor cbor2 python library

CBOR stands for Concise Binary Object Representation, which is a data format
which is very compact and extensible.

This patch moves the python library which can serilaize and deserialize python
objects to/from cbor formats. The library is taken from
https://github.com/agronholm/cbor2/ from commit
84181540f6eb650437e3f73cd104a65661fe8e67.

Unrequired files from the cbor library - docs/, tests/, setup.py, setup.cfg,
and tox.ini - have not been vendored.

There is another python library for cbor at
https://github.com/brianolson/cbor_py/ which is used in evolve extension and was
imported in initial version of this series. That library though contains C code
and is bit faster, but has known bugs around serializing nested structures, is
unmaintained, raises an Exception object instead of a more dedicated Error type.

So, it's better to use a bug free and actively maintained library.

This library is not yet used and will be used in later commits.

# no-check-commit because we are importing a third library module

Differential Revision: https://phab.mercurial-scm.org/D2750

#!/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 $?