[PATCH 8/9] vsh: Allow double quotes imbalance for auto completion in vshCommandStringGetArg()

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If user is trying to auto complete a value that contains a space,
they have two options: use backslash to escape space or use
qotes, like this:

  virsh # start --domain "domain with space<TAB>

However, in this case our tokenizer sees imbalance in (double)
quotes: there is a starting one that's missing it's companion.
Well, that's obvious - user is still in process of writing the
command. What we need to do in this case is to ignore the
imbalance and return success (from the tokenizer) - readline will
handle closing the quote properly.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 tools/vsh.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/vsh.c b/tools/vsh.c
index e5c6cebebb..53a84b9d95 100644
--- a/tools/vsh.c
+++ b/tools/vsh.c
@@ -1418,7 +1418,7 @@ vshCommandParse(vshControl *ctl, vshCommandParser *parser, vshCmd **partial)
                     if (optstr)
                         tkdata = optstr;
                     else
-                        tk = parser->getNextArg(ctl, parser, &tkdata, true);
+                        tk = parser->getNextArg(ctl, parser, &tkdata, partial == NULL);
                     if (tk == VSH_TK_ERROR)
                         goto syntaxError;
                     if (tk != VSH_TK_ARG) {
@@ -1673,10 +1673,16 @@ vshCommandStringGetArg(vshControl *ctl, vshCommandParser *parser, char **res,
 
         *q++ = *p++;
     }
+
     if (double_quote) {
-        if (report)
+        /* We have seen a double quote, but not it's companion
+         * ending. It's valid though, in case when we're called
+         * from completer (report = false), but it's not valid
+         * when parsing real command (report= true).  */
+        if (report) {
             vshError(ctl, "%s", _("missing \""));
-        return VSH_TK_ERROR;
+            return VSH_TK_ERROR;
+        }
     }
 
     *q = '\0';
-- 
2.26.2




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