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38610: vcs_info quilt: Extract a patch subject, 2.0.

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Daniel Shahaf 2016-06-04 16:57:49 +00:00
parent e8943e7007
commit 7a5ecf4909
2 changed files with 41 additions and 4 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2016-06-06 Daniel Shahaf <d.s@daniel.shahaf.name>
* 38610: Functions/VCS_Info/VCS_INFO_quilt: vcs_info quilt:
Extract a patch subject, 2.0.
* 38609: Functions/VCS_Info/VCS_INFO_quilt: vcs_info quilt:
Factor out a helper function. No functional change.

42
Functions/VCS_Info/VCS_INFO_quilt
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@ -83,15 +83,49 @@ function VCS_INFO_quilt-dirfind() {
# This function takes as an argument a filename of a patch and sets $REPLY to
# a single-line "subject", or unsets it if no subject could be extracted.
function VCS_INFO_quilt-patch2subject() {
local line
if [[ -f "$1" ]] && read -r line < "$1"; then
if [[ $line != (#b)(---|Index:)* ]]; then
REPLY=$line
integer i
integer -r LIMIT=10
local -a lines
local needle
if [[ -f "$1" ]]; then
# Extract the first LIMIT lines, or up to the first empty line or the start of the unidiffs,
# whichever comes first.
while (( i++ < LIMIT )); do
IFS= read -r "lines[$i]"
if [[ -z ${lines[$i]} ]] || [[ ${lines[$i]} == (#b)(---|Index:)* ]]; then
lines[$i]=()
break
fi
done < "$1"
if needle=${lines[(i)Subject:*]}; (( needle <= $#lines )); then
# "Subject: foo" line, plus rfc822 whitespace unfolding.
#
# Example: 'git format-patch' patches.
REPLY=${lines[needle]}
REPLY=${REPLY#*: }
REPLY=${REPLY#\[PATCH\] }
while [[ ${${lines[++needle]}[1]} == ' ' ]]; do
REPLY+=${lines[needle]}
done
elif needle=${lines[(r)Description:*]}; [[ -n $needle ]]; then
# "Description: foo" line.
#
# Example: DEP-3 patches.
REPLY=${needle#*: }
elif [[ ${lines[1]} == '# HG changeset patch' ]] && { needle=${${lines:#([#]*)}[1]}; [[ -n $needle ]] }; then
# Mercurial patch
REPLY=$needle
elif (( ${+lines[1]} )); then
# The first line of the file is not part of the diff.
REPLY=${lines[1]}
else
# The patch has no subject.
unset REPLY
return 0
fi
else
# The patch cannot be examined, or invalid arguments.
unset REPLY
return 1
fi