notes: break set_display_notes() into smaller functions

In 8164c961e1 (format-patch: use --notes behavior for format.notes,
2019-12-09), we introduced set_display_notes() which was a monolithic
function with three mutually exclusive branches. Break the function up
into three small and simple functions that each are only responsible for
one task.

This family of functions accepts an `int *show_notes` instead of
returning a value suitable for assignment to `show_notes`. This is for
two reasons. First of all, this guarantees that the external
`show_notes` variable changes in lockstep with the
`struct display_notes_opt`. Second, this prompts future developers to be
careful about doing something meaningful with this value. In fact, a
NULL check is intentionally omitted because causing a segfault here
would tell the future developer that they are meant to use the value for
something meaningful.

One alternative was making the family of functions accept a
`struct rev_info *` instead of the `struct display_notes_opt *`, since
the former contains the `show_notes` field as well. This does not work
because we have to call git_config() before repo_init_revisions().
However, if we had a `struct rev_info`, we'd need to initialize it before
it gets assigned values from git_config(). As a result, we break the
circular dependency by having standalone `int show_notes` and
`struct display_notes_opt notes_opt` variables which temporarily hold
values from git_config() until the values are copied over to `rev`.

To implement this change, we need to get a pointer to
`rev_info::show_notes`. Unfortunately, this is not possible with
bitfields and only direct-assignment is possible. Change
`rev_info::show_notes` to a non-bitfield int so that we can get its
address.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 12 insertions, 7 deletions

diff --git a/notes.h b/notes.h
index a476bfa066..3e78448181 100644
--- a/notes.h
+++ b/notes.h
@@ -266,14 +266,19 @@ struct display_notes_opt {
 void init_display_notes(struct display_notes_opt *opt);
 
 /*
- * Set a display_notes_opt to a given state. 'show_notes' is a boolean
- * representing whether or not to show notes. 'opt_ref' points to a
- * string for the notes ref, or is NULL if the default notes should be
- * used.
- *
- * Return 'show_notes' normalized to 1 or 0.
+ * This family of functions enables or disables the display of notes. In
+ * particular, 'enable_default_display_notes' will display the default notes,
+ * 'enable_default_display_notes' will display the notes ref 'ref' and
+ * 'disable_display_notes' will disable notes, including those added by previous
+ * invocations of the 'enable_*_display_notes' functions.
+ *
+ * 'show_notes' is a points to a boolean which will be set to 1 if notes are
+ * displayed, else 0. It must not be NULL.
  */
-int set_display_notes(struct display_notes_opt *opt, int show_notes, const char *opt_ref);
+void enable_default_display_notes(struct display_notes_opt *opt, int *show_notes);
+void enable_ref_display_notes(struct display_notes_opt *opt, int *show_notes,
+		const char *ref);
+void disable_display_notes(struct display_notes_opt *opt, int *show_notes);
 
 /*
  * Load the notes machinery for displaying several notes trees.