The previous patch introduced a way for builtins to declare that they
will take responsibility for handling the `pager.foo`-config item. (See
the commit message of that patch for why that could be useful.)
Provide setup_auto_pager(), which builtins can call in order to handle
`pager.<cmd>`, including possibly starting the pager. Make this function
don't do anything if a pager has already been started, as indicated by
use_pager or pager_in_use().
Whenever this function is called from a builtin, git.c will already have
called commit_pager_choice(). Since commit_pager_choice() treats the
special value -1 as "punt" or "not yet decided", it is not a problem
that we might end up calling commit_pager_choice() once in git.c and
once (or more) in the builtin. Make the new function use -1 in the same
way and document it as "punt".
Don't add any users of setup_auto_pager just yet, one will follow in
a later patch.
Suggested-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Martin Ågren <martin.agren@xxxxxxxxx>
---
builtin.h | 12 ++++++++++++
git.c | 10 ++++++++++
2 files changed, 22 insertions(+)
diff --git a/builtin.h b/builtin.h
index 0f3a7b770..42378f3aa 100644
--- a/builtin.h
+++ b/builtin.h
@@ -113,6 +113,18 @@ struct fmt_merge_msg_opts {
extern int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
struct fmt_merge_msg_opts *);
+/**
+ * If a built-in has DELAY_PAGER_CONFIG set, the built-in should call this early
+ * when it wishes to respect the `pager.foo`-config. The `cmd` is the name of
+ * the built-in, e.g., "foo". If a paging-choice has already been setup, this
+ * does nothing. The default in `def` should be 0 for "pager off", 1 for "pager
+ * on" or -1 for "punt".
+ *
+ * You should most likely use a default of 0 or 1. "Punt" (-1) could be useful
+ * to be able to fall back to some historical compatibility name.
+ */
+extern void setup_auto_pager(const char *cmd, int def);
+
extern int is_builtin(const char *s);
extern int cmd_add(int argc, const char **argv, const char *prefix);
diff --git a/git.c b/git.c
index 79195ebbd..66832f232 100644
--- a/git.c
+++ b/git.c
@@ -33,6 +33,16 @@ static void commit_pager_choice(void) {
}
}
+void setup_auto_pager(const char *cmd, int def)
+{
+ if (use_pager != -1 || pager_in_use())
+ return;
+ use_pager = check_pager_config(cmd);
+ if (use_pager == -1)
+ use_pager = def;
+ commit_pager_choice();
+}
+
static int handle_options(const char ***argv, int *argc, int *envchanged)
{
const char **orig_argv = *argv;
--
2.14.0.rc1.12.ge2d9c4613
