Introduce a ref_formatting_state which will eventually hold the values
of modifier atoms. Implement this within ref-filter.

Mentored-by: Christian Couder <christian.cou...@gmail.com>
Mentored-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik....@gmail.com>
---
 ref-filter.c | 64 +++++++++++++++++++++++++++++++++++++++++-------------------
 ref-filter.h |  5 +++++
 2 files changed, 49 insertions(+), 20 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 91482c9..2c074a1 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1190,23 +1190,23 @@ void ref_array_sort(struct ref_sorting *sorting, struct 
ref_array *array)
        qsort(array->items, array->nr, sizeof(struct ref_array_item *), 
compare_refs);
 }
 
-static void print_value(struct atom_value *v, int quote_style, struct strbuf 
*output)
+static void print_value(struct atom_value *v, struct ref_formatting_state 
*state)
 {
-       switch (quote_style) {
+       switch (state->quote_style) {
        case QUOTE_NONE:
-               strbuf_addstr(output, v->s);
+               strbuf_addstr(state->output, v->s);
                break;
        case QUOTE_SHELL:
-               sq_quote_buf(output, v->s);
+               sq_quote_buf(state->output, v->s);
                break;
        case QUOTE_PERL:
-               perl_quote_buf(output, v->s);
+               perl_quote_buf(state->output, v->s);
                break;
        case QUOTE_PYTHON:
-               python_quote_buf(output, v->s);
+               python_quote_buf(state->output, v->s);
                break;
        case QUOTE_TCL:
-               tcl_quote_buf(output, v->s);
+               tcl_quote_buf(state->output, v->s);
                break;
        }
 }
@@ -1229,7 +1229,7 @@ static int hex2(const char *cp)
                return -1;
 }
 
-static void emit(const char *cp, const char *ep, struct strbuf *output)
+static void emit(const char *cp, const char *ep, struct ref_formatting_state 
*state)
 {
        while (*cp && (!ep || cp < ep)) {
                if (*cp == '%') {
@@ -1238,35 +1238,58 @@ static void emit(const char *cp, const char *ep, struct 
strbuf *output)
                        else {
                                int ch = hex2(cp + 1);
                                if (0 <= ch) {
-                                       strbuf_addch(output, ch);
+                                       strbuf_addch(state->output, ch);
                                        cp += 3;
                                        continue;
                                }
                        }
                }
-               strbuf_addch(output, *cp);
+               strbuf_addch(state->output, *cp);
                cp++;
        }
 }
 
+static void process_formatting_state(struct atom_value *atomv, struct 
ref_formatting_state *state)
+{
+       /* Based on the atomv values, the formatting state is set */
+}
+
+static void apply_formatting_state(struct ref_formatting_state *state, struct 
strbuf *final)
+{
+       /* More formatting options to be evetually added */
+       strbuf_addbuf(final, state->output);
+       strbuf_release(state->output);
+}
+
 void show_ref_array_item(struct ref_array_item *info, const char *format, int 
quote_style)
 {
        const char *cp, *sp, *ep;
-       struct strbuf output = STRBUF_INIT;
+       struct strbuf value = STRBUF_INIT;
+       struct strbuf final_buf = STRBUF_INIT;
+       struct ref_formatting_state state;
        int i;
 
+       memset(&state, 0, sizeof(state));
+       state.quote_style = quote_style;
+       state.output = &value;
+
        for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
-               struct atom_value *atomv;
+               struct atom_value *atomv = NULL;
 
                ep = strchr(sp, ')');
-               if (cp < sp)
-                       emit(cp, sp, &output);
+               if (cp < sp) {
+                       emit(cp, sp, &state);
+                       apply_formatting_state(&state, &final_buf);
+               }
                get_ref_atom_value(info, parse_ref_filter_atom(sp + 2, ep), 
&atomv);
-               print_value(atomv, quote_style, &output);
+               process_formatting_state(atomv, &state);
+               print_value(atomv, &state);
+               apply_formatting_state(&state, &final_buf);
        }
        if (*cp) {
                sp = cp + strlen(cp);
-               emit(cp, sp, &output);
+               emit(cp, sp, &state);
+               apply_formatting_state(&state, &final_buf);
        }
        if (need_color_reset_at_eol) {
                struct atom_value resetv;
@@ -1275,12 +1298,13 @@ void show_ref_array_item(struct ref_array_item *info, 
const char *format, int qu
                if (color_parse("reset", color) < 0)
                        die("BUG: couldn't parse 'reset' as a color");
                resetv.s = color;
-               print_value(&resetv, quote_style, &output);
+               print_value(&resetv, &state);
+               apply_formatting_state(&state, &final_buf);
        }
-       for (i = 0; i < output.len; i++)
-               printf("%c", output.buf[i]);
+       for (i = 0; i < final_buf.len; i++)
+               printf("%c", final_buf.buf[i]);
        putchar('\n');
-       strbuf_release(&output);
+       strbuf_release(&final_buf);
 }
 
 /*  If no sorting option is given, use refname to sort as default */
diff --git a/ref-filter.h b/ref-filter.h
index 6bf27d8..9e6c2d4 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -16,6 +16,11 @@
 #define FILTER_REFS_INCLUDE_BROKEN 0x1
 #define FILTER_REFS_ALL 0x2
 
+struct ref_formatting_state {
+       int quote_style;
+       struct strbuf *output;
+};
+
 struct atom_value {
        const char *s;
        unsigned long ul; /* used for sorting when not FIELD_STR */
-- 
2.5.0

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