[PATCH] perf tools: Correct typing errors about '-' or '_' in config variable.

[Taeung Song <treeze.taeung@gmail.com>]

To improve perf config usability, we should probably also recognize
underscores in perf config entries, i.e. the following variants
should both work: as suggested by Ingo Molnar

        print_percent = 1
        print-percent = 1

So, add functionality for it.
'annotate' section has variables that contain '_' underscores like:

        hide_src_code
        use_offset
        jump_arrows
        show_nr_jumps

However other sections has variables that contain a '-' dash
or neither it or underscore i.e.

        ui.show-headers
        call-graph.print-limit
        tui.report

So, convert the characters if typing errors about underscores
or a dash when parsing the config file.

Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/util/config.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 2e452ac..69db606 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -129,7 +129,10 @@ static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 {
 	int c;
 	char *value;
+	bool has_underscore = false;
 
+	if (prefixcmp(name, "annotate.") == 0)
+		has_underscore = true;
 	/* Get the full name */
 	for (;;) {
 		c = get_next_char();
@@ -137,6 +140,11 @@ static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 			break;
 		if (!iskeychar(c))
 			break;
+		/* Correct typing errors about dash or underscore */
+		if (has_underscore && c == '-')
+			c = '_';
+		else if (!has_underscore && c == '_')
+			c = '-';
 		name[len++] = c;
 		if (len >= MAXNAME)
 			return -1;
-- 
1.9.1