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subtree: parse revs in individual cmd_ functions

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The main argument parser goes ahead and tries to parse revs to make
things simpler for the sub-command implementations.  But, it includes
enough special cases for different sub-commands.  And it's difficult
having having to think about "is this info coming from an argument, or a
global variable?".  So the main argument parser's effort to make things
"simpler" ends up just making it more confusing and complicated.

Begone with the 'revs' global variable; parse 'rev=$(...)' as needed in
individual 'cmd_*' functions.

Begone with the 'default' global variable.  Its would-be value is
knowable just from which function we're in.

Begone with the 'ensure_single_rev' function.  Its functionality can be
achieved by passing '--verify' to 'git rev-parse'.

Signed-off-by: Luke Shumaker <lukeshu@datawire.io>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Luke Shumaker 2021-04-27 15:17:39 -06:00 committed by Junio C Hamano
parent bbffb02383
commit e4f8baa88a
1 changed files with 24 additions and 38 deletions
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62
contrib/subtree/git-subtree.sh
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@ -76,13 +76,6 @@ assert () {
fi
}
ensure_single_rev () {
if test $# -ne 1
then
die "You must provide exactly one revision. Got: '$*'"
fi
}
main () {
if test $# -eq 0
then
@ -164,11 +157,8 @@ main () {
shift
case "$arg_command" in
add|merge|pull)
default=
;;
split|push)
default="--default HEAD"
add|merge|pull|split|push)
:
;;
*)
die "Unknown command '$arg_command'"
@ -193,22 +183,8 @@ main () {
dir="$(dirname "$arg_prefix/.")"
if test "$arg_command" != "pull" &&
test "$arg_command" != "add" &&
test "$arg_command" != "push"
then
revs=$(git rev-parse $default --revs-only "$@") || exit $?
dirs=$(git rev-parse --no-revs --no-flags "$@") || exit $?
ensure_single_rev $revs
if test -n "$dirs"
then
die "Error: Use --prefix instead of bare filenames."
fi
fi
debug "command: {$arg_command}"
debug "quiet: {$GIT_QUIET}"
debug "revs: {$revs}"
debug "dir: {$dir}"
debug "opts: {$*}"
debug
@ -714,14 +690,13 @@ cmd_add_repository () {
repository=$1
refspec=$2
git fetch "$@" || exit $?
revs=FETCH_HEAD
set -- $revs
cmd_add_commit "$@"
cmd_add_commit FETCH_HEAD
}
cmd_add_commit () {
rev=$(git rev-parse $default --revs-only "$@") || exit $?
ensure_single_rev $rev
# The rev has already been validated by cmd_add(), we just
# need to normalize it.
rev=$(git rev-parse --verify "$1^{commit}") || exit $?
debug "Adding $dir as '$rev'..."
git read-tree --prefix="$dir" $rev || exit $?
@ -752,6 +727,17 @@ cmd_add_commit () {
}
cmd_split () {
if test $# -eq 0
then
rev=$(git rev-parse HEAD)
elif test $# -eq 1
then
rev=$(git rev-parse -q --verify "$1^{commit}") ||
die "'$1' does not refer to a commit"
else
die "You must provide exactly one revision. Got: '$*'"
fi
debug "Splitting $dir..."
cache_setup || exit $?
@ -768,12 +754,12 @@ cmd_split () {
done || exit $?
fi
unrevs="$(find_existing_splits "$dir" "$revs")" || exit $?
unrevs="$(find_existing_splits "$dir" "$rev")" || exit $?
# We can't restrict rev-list to only $dir here, because some of our
# parents have the $dir contents the root, and those won't match.
# (and rev-list --follow doesn't seem to solve this)
grl='git rev-list --topo-order --reverse --parents $revs $unrevs'
grl='git rev-list --topo-order --reverse --parents $rev $unrevs'
revmax=$(eval "$grl" | wc -l)
revcount=0
createcount=0
@ -820,8 +806,10 @@ cmd_split () {
}
cmd_merge () {
rev=$(git rev-parse $default --revs-only "$@") || exit $?
ensure_single_rev $rev
test $# -eq 1 ||
die "You must provide exactly one revision. Got: '$*'"
rev=$(git rev-parse -q --verify "$1^{commit}") ||
die "'$1' does not refer to a commit"
ensure_clean
if test -n "$arg_addmerge_squash"
@ -861,9 +849,7 @@ cmd_pull () {
ensure_clean
ensure_valid_ref_format "$2"
git fetch "$@" || exit $?
revs=FETCH_HEAD
set -- $revs
cmd_merge "$@"
cmd_merge FETCH_HEAD
}
cmd_push () {