Continue removing any printing from ref-filter formatting logic,
so that it could be more general.

Change the signature of parse_ref_filter_atom() by changing return value,
adding previous return value to function parameter and also adding
strbuf parameter for error message.

Signed-off-by: Olga Telezhnaia <olyatelezhn...@gmail.com>
---
 ref-filter.c | 43 ++++++++++++++++++++++++++++++-------------
 1 file changed, 30 insertions(+), 13 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index d120360104806..dd83ef326511d 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -397,7 +397,8 @@ struct atom_value {
  * Used to parse format string and sort specifiers
  */
 static int parse_ref_filter_atom(const struct ref_format *format,
-                                const char *atom, const char *ep)
+                                const char *atom, const char *ep, int *res,
+                                struct strbuf *err)
 {
        const char *sp;
        const char *arg;
@@ -406,14 +407,18 @@ static int parse_ref_filter_atom(const struct ref_format 
*format,
        sp = atom;
        if (*sp == '*' && sp < ep)
                sp++; /* deref */
-       if (ep <= sp)
-               die(_("malformed field name: %.*s"), (int)(ep-atom), atom);
+       if (ep <= sp) {
+               strbuf_addf(err, _("malformed field name: %.*s"), 
(int)(ep-atom), atom);
+               return -1;
+       }
 
        /* Do we have the atom already used elsewhere? */
        for (i = 0; i < used_atom_cnt; i++) {
                int len = strlen(used_atom[i].name);
-               if (len == ep - atom && !memcmp(used_atom[i].name, atom, len))
-                       return i;
+               if (len == ep - atom && !memcmp(used_atom[i].name, atom, len)) {
+                       *res = i;
+                       return 0;
+               }
        }
 
        /*
@@ -432,8 +437,10 @@ static int parse_ref_filter_atom(const struct ref_format 
*format,
                        break;
        }
 
-       if (ARRAY_SIZE(valid_atom) <= i)
-               die(_("unknown field name: %.*s"), (int)(ep-atom), atom);
+       if (ARRAY_SIZE(valid_atom) <= i) {
+               strbuf_addf(err, _("unknown field name: %.*s"), (int)(ep-atom), 
atom);
+               return -1;
+       }
 
        /* Add it in, including the deref prefix */
        at = used_atom_cnt;
@@ -458,7 +465,8 @@ static int parse_ref_filter_atom(const struct ref_format 
*format,
                need_tagged = 1;
        if (!strcmp(valid_atom[i].name, "symref"))
                need_symref = 1;
-       return at;
+       *res = at;
+       return 0;
 }
 
 static void quote_formatting(struct strbuf *s, const char *str, int 
quote_style)
@@ -725,17 +733,20 @@ int verify_ref_format(struct ref_format *format)
 
        format->need_color_reset_at_eol = 0;
        for (cp = format->format; *cp && (sp = find_next(cp)); ) {
+               struct strbuf err = STRBUF_INIT;
                const char *color, *ep = strchr(sp, ')');
                int at;
 
                if (!ep)
                        return error(_("malformed format string %s"), sp);
                /* sp points at "%(" and ep points at the closing ")" */
-               at = parse_ref_filter_atom(format, sp + 2, ep);
+               if (parse_ref_filter_atom(format, sp + 2, ep, &at, &err))
+                       die("%s", err.buf);
                cp = ep + 1;
 
                if (skip_prefix(used_atom[at].name, "color:", &color))
                        format->need_color_reset_at_eol = !!strcmp(color, 
"reset");
+               strbuf_release(&err);
        }
        if (format->need_color_reset_at_eol && !want_color(format->use_color))
                format->need_color_reset_at_eol = 0;
@@ -2154,13 +2165,14 @@ int format_ref_array_item(struct ref_array_item *info,
 
        for (cp = format->format; *cp && (sp = find_next(cp)); cp = ep + 1) {
                struct atom_value *atomv;
+               int pos;
 
                ep = strchr(sp, ')');
                if (cp < sp)
                        append_literal(cp, sp, &state);
-               get_ref_atom_value(info,
-                                  parse_ref_filter_atom(format, sp + 2, ep),
-                                  &atomv);
+               if (parse_ref_filter_atom(format, sp + 2, ep, &pos, error_buf))
+                       return -1;
+               get_ref_atom_value(info, pos, &atomv);
                if (atomv->handler(atomv, &state, error_buf))
                        return -1;
        }
@@ -2215,7 +2227,12 @@ static int parse_sorting_atom(const char *atom)
         */
        struct ref_format dummy = REF_FORMAT_INIT;
        const char *end = atom + strlen(atom);
-       return parse_ref_filter_atom(&dummy, atom, end);
+       struct strbuf err = STRBUF_INIT;
+       int res;
+       if (parse_ref_filter_atom(&dummy, atom, end, &res, &err))
+               die("%s", err.buf);
+       strbuf_release(&err);
+       return res;
 }
 
 /*  If no sorting option is given, use refname to sort as default */

--
https://github.com/git/git/pull/466

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