On Tue, Apr 23, 2019 at 12:45:17PM +0900, Junio C Hamano wrote:
> Jeff King <peff@xxxxxxxx> writes:
>
> > ... I don't think it would be
> > too big a problem for format-patch to learn some options to configure
> > its diffs. We already have some options in format.* for various things.
>
> I am not sure; diff.context is rather special in that the variable
> behind it belongs to the diff layer and is set via diff_config that
> is called by diff_ui_config that in turn is called by log_config
> which is called by format_config.
>
> If we want to say "format.context" trumps "diff.config", then a new
> internal variable to receive the value of the variable must be
> invented and after the config gets read, cmd_format_patch() needs to
> do something silly like this:
>
> git_config(git_format_config, NULL);
> + if (format_context != -1)
> + diff_default_context = format_context;
> repo_init_revisions(the_repository, &rev, prefix);
>
> committing layering violation by exposing diff_default_context
> variable.
After init_revisions(), we'll have called diff_setup(), which puts
diff_context_default into revs->diffopt. So we still have to do the "if
we have a format-specific value, then override..." conditional. But we
can do it without touching the hidden variable:
diff --git a/builtin/log.c b/builtin/log.c
index 57869267d8..0de2ee0905 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1613,14 +1613,16 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
repo_init_revisions(the_repository, &rev, prefix);
rev.commit_format = CMIT_FMT_EMAIL;
rev.expand_tabs_in_log_default = 0;
rev.verbose_header = 1;
rev.diff = 1;
rev.max_parents = 1;
rev.diffopt.flags.recursive = 1;
+ if (format_context != -1)
+ rev.diffopt.context = format_context;
rev.subject_prefix = fmt_patch_subject_prefix;
memset(&s_r_opt, 0, sizeof(s_r_opt));
s_r_opt.def = "HEAD";
s_r_opt.revarg_opt = REVARG_COMMITTISH;
if (default_attach) {
rev.mime_boundary = default_attach;
-Peff
