view hgeditor @ 37107:71543b942eea

merge: return an attrs class from update() and applyupdates()

Previously, we returned a tuple containing counts. The result of an
update is kind of complex and the use of tuples with nameless fields
made the code a bit harder to read and constrained future expansion
of the return value.

Let's invent an attrs-defined class for representing the result of
an update operation.

We provide __getitem__ and __len__ implementations for backwards
compatibility as a container type to minimize code churn.

In (at least) Python 2, the % operator seems to insist on using
tuples. So we had to update a consumer using the % operator.

.. api::

   merge.update() and merge.applyupdates() now return a class
   with named attributes instead of a tuple. Switch consumers
   to access elements by name instead of by offset.

Differential Revision: https://phab.mercurial-scm.org/D2692

#!/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 $?