tools lib subcmd: Suppport cascading options

Sometimes subcommand have common options and it can only handled in the
upper level command unless it duplicates the options.

This patch adds a parent field and fallback to the parent if the given
argument was not found in the current options.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20161024030003.28534-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/tools/lib/subcmd/parse-options.c b/tools/lib/subcmd/parse-options.c
index 981bb4481fd5..3284bb14ae78 100644
--- a/tools/lib/subcmd/parse-options.c
+++ b/tools/lib/subcmd/parse-options.c
@@ -314,12 +314,19 @@ static int get_value(struct parse_opt_ctx_t *p,
 
 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 {
+retry:
         for (; options->type != OPTION_END; options++) {
                 if (options->short_name == *p->opt) {
                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
                         return get_value(p, options, OPT_SHORT);
                 }
         }
+
+        if (options->parent) {
+                options = options->parent;
+                goto retry;
+        }
+
         return -2;
 }
 
@@ -333,6 +340,7 @@ static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
         if (!arg_end)
                 arg_end = arg + strlen(arg);
 
+retry:
         for (; options->type != OPTION_END; options++) {
                 const char *rest;
                 int flags = 0;
@@ -426,6 +434,12 @@ match:
         }
         if (abbrev_option)
                 return get_value(p, abbrev_option, abbrev_flags);
+
+        if (options->parent) {
+                options = options->parent;
+                goto retry;
+        }
+
         return -2;
 }
 
diff --git a/tools/lib/subcmd/parse-options.h b/tools/lib/subcmd/parse-options.h
index d60cab2726da..8866ac438b34 100644
--- a/tools/lib/subcmd/parse-options.h
+++ b/tools/lib/subcmd/parse-options.h
@@ -109,11 +109,13 @@ struct option {
         intptr_t defval;
         bool *set;
         void *data;
+        const struct option *parent;
 };
 
 #define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v )
 
 #define OPT_END()                   { .type = OPTION_END }
+#define OPT_PARENT(p)               { .type = OPTION_END, .parent = (p) }
 #define OPT_ARGUMENT(l, h)          { .type = OPTION_ARGUMENT, .long_name = (l), .help = (h) }
 #define OPT_GROUP(h)                { .type = OPTION_GROUP, .help = (h) }
 #define OPT_BIT(s, l, v, h, b)      { .type = OPTION_BIT, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h), .defval = (b) }