[PATCH 6/7] builtin-help: make it possible to exclude some commands in list_commands()

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The supposed method is to build a list of commands to be excluded using
add_cmdname(), then pass the list as the new exclude parameter. If no
exclude is needed, NULL should be used.

Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---
 help.c |   24 ++++++++++--------------
 help.h |   14 +++++++++++++-
 2 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/help.c b/help.c
index f71fff4..de1be6d 100644
--- a/help.c
+++ b/help.c
@@ -9,6 +9,7 @@
 #include "common-cmds.h"
 #include "parse-options.h"
 #include "run-command.h"
+#include "help.h"
 
 static struct man_viewer_list {
 	struct man_viewer_list *next;
@@ -300,16 +301,9 @@ static inline void mput_char(char c, unsigned int num)
 		putchar(c);
 }
 
-static struct cmdnames {
-	int alloc;
-	int cnt;
-	struct cmdname {
-		size_t len;
-		char name[1];
-	} **names;
-} main_cmds, other_cmds;
+struct cmdnames main_cmds, other_cmds;
 
-static void add_cmdname(struct cmdnames *cmds, const char *name, int len)
+void add_cmdname(struct cmdnames *cmds, const char *name, int len)
 {
 	struct cmdname *ent = xmalloc(sizeof(*ent) + len);
 
@@ -458,7 +452,7 @@ static unsigned int list_commands_in_dir(struct cmdnames *cmds,
 	return longest;
 }
 
-static unsigned int load_command_list(const char *prefix)
+static unsigned int load_command_list(const char *prefix, struct cmdnames *exclude)
 {
 	unsigned int longest = 0;
 	unsigned int len;
@@ -497,13 +491,15 @@ static unsigned int load_command_list(const char *prefix)
 	      sizeof(*other_cmds.names), cmdname_compare);
 	uniq(&other_cmds);
 	exclude_cmds(&other_cmds, &main_cmds);
+	if (exclude)
+		exclude_cmds(&main_cmds, exclude);
 
 	return longest;
 }
 
-void list_commands(const char *prefix, const char *title)
+void list_commands(const char *prefix, const char *title, struct cmdnames *exclude)
 {
-	unsigned int longest = load_command_list(prefix);
+	unsigned int longest = load_command_list(prefix, exclude);
 	const char *exec_path = git_exec_path();
 
 	if (main_cmds.cnt) {
@@ -551,7 +547,7 @@ static int is_in_cmdlist(struct cmdnames *c, const char *s)
 
 int is_git_command(const char *s, const char *prefix)
 {
-	load_command_list(prefix);
+	load_command_list(prefix, NULL);
 	return is_in_cmdlist(&main_cmds, s) ||
 		is_in_cmdlist(&other_cmds, s);
 }
@@ -697,7 +693,7 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 
 	if (show_all) {
 		printf("usage: %s\n\n", git_usage_string);
-		list_commands("git-", "git commands");
+		list_commands("git-", "git commands", NULL);
 		printf("%s\n", git_more_info_string);
 		return 0;
 	}
diff --git a/help.h b/help.h
index 0741662..85d3b74 100644
--- a/help.h
+++ b/help.h
@@ -1,7 +1,19 @@
 #ifndef HELP_H
 #define HELP_H
 
+struct cmdnames {
+	int alloc;
+	int cnt;
+	struct cmdname {
+		size_t len;
+		char name[1];
+	} **names;
+};
+
 int is_git_command(const char *s, const char *prefix);
-void list_commands(const char *prefix, const char *title);
+void list_commands(const char *prefix, const char *title, struct cmdnames *exclude);
+void add_cmdname(struct cmdnames *cmds, const char *name, int len);
+
+extern struct cmdnames main_cmds, other_cmds;
 
 #endif /* HELP_H */
-- 
1.6.0.rc0.14.g95f8.dirty

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