Re: [PATCH] git-am: Ignore whitespace before patches

> Change git-am to ignore whitespace (as defined by sh's read) at the
> beginning of patches.
>
> Empty lines are wont to creep in at the beginning of patches, here's
> an example from a raw Gmail attachment:
>
>    20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
>    20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 0a  |               .|
>    52 65 74 75 72 6e 2d 50  61 74 68 3a 20 3c 61 76  |Return-Path: <av|
>
> Whitespace is also likely to appear if the user copy/pastes the patch
> around, e.g. via a pastebin, or any any number of other cases. This
> harms nothing and makes git-am's detection more fault tolerant.
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
>  git-am.sh     |   16 +++++++++++++++-
>  t/t4150-am.sh |   30 ++++++++++++++++++++++++++++++
>  2 files changed, 45 insertions(+), 1 deletions(-)
>
> diff --git a/git-am.sh b/git-am.sh
> index 1056075..1b4baa8 100755
> --- a/git-am.sh
> +++ b/git-am.sh
> @@ -172,7 +172,21 @@ check_patch_format () {
>        # otherwise, check the first few lines of the first patch to try
>        # to detect its format
>        {
> -               read l1
> +               while read -r line
> +               do
> +                       case "$line" in
> +                               "")
> +                                       # Just skip whitespace
> +                                       continue
> +                                       ;;
> +                               *)
> +                                       # First non-empty line
> +                                       l1=$line
> +                                       break
> +                                       ;;
> +                       esac
> +               done
> +
>                read l2
>                read l3
>                case "$l1" in
> diff --git a/t/t4150-am.sh b/t/t4150-am.sh
> index 810b04b..3d089de 100755
> --- a/t/t4150-am.sh
> +++ b/t/t4150-am.sh
> @@ -318,6 +318,36 @@ test_expect_success 'am without --committer-date-is-author-date' '
>        test "$at" != "$ct"
>  '
>
> +test_expect_success 'am applying a patch that begins with an empty line' '
> +       git checkout first &&
> +       test_tick &&
> +       echo > patch1-white &&
> +       cat patch1 >> patch1-white &&
> +       git am patch1-white &&
> +       git cat-file commit HEAD | sed -e "/^\$/q" >head1 &&
> +       at=$(sed -ne "/^author /s/.*> //p" head1) &&
> +       ct=$(sed -ne "/^committer /s/.*> //p" head1) &&
> +       test "$at" != "$ct"
> +'
> +
> +test_expect_success 'am applying a patch that begins with many empty lines' '
> +       git checkout first &&
> +       test_tick &&
> +       echo "   " > patch1-white2 &&
> +       echo "  " >> patch1-white2 &&
> +       echo " " >> patch1-white2 &&
> +       echo "" >> patch1-white2 &&
> +       echo " " >> patch1-white2 &&
> +       echo "  " >> patch1-white2 &&
> +       echo "   " >> patch1-white2 &&
> +       cat patch1 >> patch1-white2 &&
> +       git am patch1-white2 &&
> +       git cat-file commit HEAD | sed -e "/^\$/q" >head1 &&
> +       at=$(sed -ne "/^author /s/.*> //p" head1) &&
> +       ct=$(sed -ne "/^committer /s/.*> //p" head1) &&
> +       test "$at" != "$ct"
> +'
> +
>  # This checks for +0000 because TZ is set to UTC and that should
>  # show up when the current time is used. The date in message is set
>  # by test_tick that uses -0700 timezone; if this feature does not
> --
> 1.7.1.84.gd92f8
>
>