Jeff King <peff@xxxxxxxx> writes:
> The only ident-parsing function we currently provide is
> get_author_ident_from_commit. This is not very
> flexible for two reasons:
>
> 1. It takes a commit as an argument, and can't read from
> commit headers saved on disk.
>
> 2. It will only parse authors, not committers.
>
> This patch provides a more flexible interface which will
> parse multiple idents from a commit provide on stdin. We can
> easily use it as a building block for the current function
> to retain compatibility.
>
> Signed-off-by: Jeff King <peff@xxxxxxxx>
> ---
> Since we are counting processes in this series, I should note that this
> actually adds a subshell invocation for each call, since it went from:
>
> script='...'
> sed $script
>
> to:
>
> sed "$(make_script)"
>
> For filter-branch, which is really the only high-performance caller we
> have, this is negated by the fact that it will do author and committer
> at the same time, saving us an extra subshell (in addition to an extra
> sed invocation).
Given that pick-ident-script is a const function, a caller that
repeatedly call is could call it once and use it in a variable, no?
>
> git-sh-setup.sh | 62 +++++++++++++++++++++++++++++++++++++++------------------
> 1 file changed, 43 insertions(+), 19 deletions(-)
>
> diff --git a/git-sh-setup.sh b/git-sh-setup.sh
> index ee0e0bc..22f0aed 100644
> --- a/git-sh-setup.sh
> +++ b/git-sh-setup.sh
> @@ -191,28 +191,52 @@ get_author_ident_from_commit () {
> fi
> }
>
> +# Generate a sed script to parse identities from a commit.
> +#
> +# Reads the commit from stdin, which should be in raw format (e.g., from
> +# cat-file or "--pretty=raw").
> +#
> +# The first argument specifies the ident line to parse (e.g., "author"), and
> +# the second specifies the environment variable to put it in (e.g., "AUTHOR"
> +# for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
> +# committer.
> +pick_ident_script () {
> + while test $# -gt 0
> + do
> + lid=$1; shift
> + uid=$1; shift
> + printf '%s' "
> + /^$lid /{
> + s/'/'\\\\''/g
> + h
> + s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
> + s/.*/GIT_${uid}_NAME='&'/p
> +
> + g
> + s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
> + s/.*/GIT_${uid}_EMAIL='&'/p
> +
> + g
> + s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
> + s/.*/GIT_${uid}_DATE='&'/p
> + }
> + "
> + done
> + echo '/^$/q'
> +}
> +
> +# Create a pick-script as above and feed it to sed. Stdout is suitable for
> +# feeding to eval.
> +parse_ident_from_commit () {
> + LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
> +}
> +
> +# Parse the author from a commit given as an argument. Stdout is suitable for
> +# feeding to eval to set the usual GIT_* ident variables.
> get_author_ident_from_commit () {
> - pick_author_script='
> - /^author /{
> - s/'\''/'\''\\'\'\''/g
> - h
> - s/^author \([^<]*\) <[^>]*> .*$/\1/
> - s/.*/GIT_AUTHOR_NAME='\''&'\''/p
> -
> - g
> - s/^author [^<]* <\([^>]*\)> .*$/\1/
> - s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
> -
> - g
> - s/^author [^<]* <[^>]*> \(.*\)$/@\1/
> - s/.*/GIT_AUTHOR_DATE='\''&'\''/p
> -
> - q
> - }
> - '
> encoding=$(git config i18n.commitencoding || echo UTF-8)
> git show -s --pretty=raw --encoding="$encoding" "$1" -- |
> - LANG=C LC_ALL=C sed -ne "$pick_author_script"
> + parse_ident_from_commit author AUTHOR
> }
>
> # Clear repo-local GIT_* environment variables. Useful when switching to
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