view hgeditor @ 44639:bc847878f4c0

hgcli: customize for Mercurial

Now that we have a shiny new PyOxidizer-based hgcli project, let's
customize it for Mercurial!

This commit replaces the auto-generated pyoxidizer.bzl with one
that installs Mercurial from the local source repository.

A README.md with build instructions has been added.

The Cargo.toml file has been updated to reflect the proper license
and reference the added README.md.

In my Linux environment, running the test suite yields 27 failures.

It's worth noting the run time of the test harness on Linux on my
Ryzen 3950X:

before: 378s wall; 9982s user; 1195s sys
after:  353s wall; 8996s user;  958s sys
% orig: 93.4 wall;  90.1  user; 80.2 sys

While I haven't measured explicitly, I suspect the performance win is
due to in-memory resource loading (which is known to be faster than
Python's filesystem importer).

Differential Revision: https://phab.mercurial-scm.org/D8351

#!/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 $?