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# 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.
{
setopt localoptions extendedglob
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]} == "commit "[0-9a-f](#c40) ]] &&
[[ ${lines[2]} == "Author:"* && ${lines[3]} == "Date:"* ]] &&
(( ! ${+lines[4]} )); then
# `git show` output.
#
# The log message is after the first blank line, so open() the file
# again. Also check whether the following line (second line of the
# log message itself) is empty.
{
repeat 4 { IFS= read -r }
IFS= read -r needle; needle=${needle#' '}
if IFS= read -r; REPLY=${REPLY#' '}; [[ -n $REPLY ]]; then
needle+='...'
fi
} < "$1"
REPLY=$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
}
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