Re: [PATCH v2 3/4] diff: add flag to indicate textconv was set via cmdline

[Stefan Beller <sbeller@google.com>]

On Mon, Oct 30, 2017 at 12:46 PM, Brandon Williams <bmwill@google.com> wrote:
> git-show is unique in that it wants to use textconv by default except
> for when it is showing blobs.  When asked to show a blob, show doesn't
> want to use textconv unless the user explicitly requested that it be
> used by providing the command line flag '--textconv'.
>
> Currently this is done by using a parallel set of 'touched' flags which
> get set every time a particular flag is set or cleared.  In a future
> patch we want to eliminate this parallel set of flags so instead of
> relying on if the textconv flag has been touched, add a new flag
> 'TEXTCONV_SET_VIA_CMDLINE' which is only set if textconv is requested
> via the command line.

Is it worth mentioning 4197361e39 (Merge branch 'mg/more-textconv',
2013-10-23), that introduced the touched_flags?
(+cc Michael Gruber FYI)

> Signed-off-by: Brandon Williams <bmwill@google.com>
> ---
>  builtin/log.c | 2 +-
>  diff.c        | 8 +++++---
>  diff.h        | 1 +
>  3 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/builtin/log.c b/builtin/log.c
> index dc28d43eb..82131751d 100644
> --- a/builtin/log.c
> +++ b/builtin/log.c
> @@ -485,7 +485,7 @@ static int show_blob_object(const struct object_id *oid, struct rev_info *rev, c
>         unsigned long size;
>
>         fflush(rev->diffopt.file);
> -       if (!DIFF_OPT_TOUCHED(&rev->diffopt, ALLOW_TEXTCONV) ||
> +       if (!DIFF_OPT_TST(&rev->diffopt, TEXTCONV_SET_VIA_CMDLINE) ||
>             !DIFF_OPT_TST(&rev->diffopt, ALLOW_TEXTCONV))
>                 return stream_blob_to_fd(1, oid, NULL, 0);
>
> diff --git a/diff.c b/diff.c
> index 3ad9c9b31..8b700b1bd 100644
> --- a/diff.c
> +++ b/diff.c
> @@ -4762,11 +4762,13 @@ int diff_opt_parse(struct diff_options *options,
>                 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
>         else if (!strcmp(arg, "--no-ext-diff"))
>                 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
> -       else if (!strcmp(arg, "--textconv"))
> +       else if (!strcmp(arg, "--textconv")) {
>                 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
> -       else if (!strcmp(arg, "--no-textconv"))
> +               DIFF_OPT_SET(options, TEXTCONV_SET_VIA_CMDLINE);
> +       } else if (!strcmp(arg, "--no-textconv")) {
>                 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);

Also clear TEXTCONV_SET_VIA_CMDLINE here?
(`git show --textconv --no-textconv` might act funny?)

> -       else if (!strcmp(arg, "--ignore-submodules")) {
> +               DIFF_OPT_CLR(options, TEXTCONV_SET_VIA_CMDLINE);
> +       } else if (!strcmp(arg, "--ignore-submodules")) {
>                 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
>                 handle_ignore_submodules_arg(options, "all");
>         } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
> diff --git a/diff.h b/diff.h
> index 47e6d43cb..4eaf9b370 100644
> --- a/diff.h
> +++ b/diff.h
> @@ -83,6 +83,7 @@ struct diff_flags {
>         unsigned DIRSTAT_CUMULATIVE:1;
>         unsigned DIRSTAT_BY_FILE:1;
>         unsigned ALLOW_TEXTCONV:1;
> +       unsigned TEXTCONV_SET_VIA_CMDLINE:1;
>         unsigned DIFF_FROM_CONTENTS:1;
>         unsigned DIRTY_SUBMODULES:1;
>         unsigned IGNORE_UNTRACKED_IN_SUBMODULES:1;
> --
> 2.15.0.403.gc27cc4dac6-goog
>