[PATCH 02/12] vsh: Don't put VSH_OT_ALIAS onto list of completions

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

We've invented VSH_OT_ALIAS type for --option so that we can
rewrite some --options (e.g. fix spelling). For instance
blkdeviotune command uses this feature heavily:
--options-with-dash are preferred over old
--options_with_underscore. Both versions are supported but only
the new ones (not aliased) are documented and reported in --help.

Except for options completer, which happily put also aliased
versions in front of user's eyes.

Note, there is a second (gross) way we use aliases: to rewrite
options from --oldoption to --newoption=value (for instance
--shareable option of attach-disk is an alias of
--mode=shareable). And just like with the previous group - don't
generate them into the list of possible options.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 tools/vsh.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/vsh.c b/tools/vsh.c
index a242619b8a..cc777bee12 100644
--- a/tools/vsh.c
+++ b/tools/vsh.c
@@ -2614,7 +2614,6 @@ vshReadlineOptionsGenerator(const char *text,
 {
     size_t list_index = 0;
     size_t len = strlen(text);
-    const char *name;
     size_t ret_size = 0;
     char **ret = NULL;
 
@@ -2624,12 +2623,15 @@ vshReadlineOptionsGenerator(const char *text,
     if (!cmd->opts)
         return NULL;
 
-    while ((name = cmd->opts[list_index].name)) {
+    for (list_index = 0; cmd->opts[list_index].name; list_index++) {
+        const char *name = cmd->opts[list_index].name;
         bool exists = false;
         vshCmdOpt *opt =  last->opts;
         size_t name_len;
 
-        list_index++;
+        /* Skip aliases, we do not report them in help output either. */
+        if (cmd->opts[list_index].type == VSH_OT_ALIAS)
+            continue;
 
         if (len > 2) {
             /* provide auto-complete only when the text starts with -- */
-- 
2.26.2