This is more inline with how we handle color slots in other code. It
also allows us to get the list of configurable color slots later.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 grep.c | 106 ++++++++++++++++++++++++++-------------------------------
 grep.h |  21 +++++++-----
 2 files changed, 62 insertions(+), 65 deletions(-)

diff --git a/grep.c b/grep.c
index 45ec7e636c..d94e2c4aeb 100644
--- a/grep.c
+++ b/grep.c
@@ -13,6 +13,17 @@ static int grep_source_is_binary(struct grep_source *gs);
 
 static struct grep_opt grep_defaults;
 
+static const char *color_grep_slots[] = {
+       [GREP_COLOR_CONTEXT]        = "context",
+       [GREP_COLOR_FILENAME]       = "filename",
+       [GREP_COLOR_FUNCTION]       = "function",
+       [GREP_COLOR_LINENO]         = "lineNumber",
+       [GREP_COLOR_MATCH_CONTEXT]  = "matchContext",
+       [GREP_COLOR_MATCH_SELECTED] = "matchSelected",
+       [GREP_COLOR_SELECTED]       = "selected",
+       [GREP_COLOR_SEP]            = "separator",
+};
+
 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
 {
        fwrite(buf, size, 1, stdout);
@@ -42,14 +53,14 @@ void init_grep_defaults(void)
        opt->pathname = 1;
        opt->max_depth = -1;
        opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
-       color_set(opt->color_context, "");
-       color_set(opt->color_filename, "");
-       color_set(opt->color_function, "");
-       color_set(opt->color_lineno, "");
-       color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
-       color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
-       color_set(opt->color_selected, "");
-       color_set(opt->color_sep, GIT_COLOR_CYAN);
+       color_set(opt->colors[GREP_COLOR_CONTEXT], "");
+       color_set(opt->colors[GREP_COLOR_FILENAME], "");
+       color_set(opt->colors[GREP_COLOR_FUNCTION], "");
+       color_set(opt->colors[GREP_COLOR_LINENO], "");
+       color_set(opt->colors[GREP_COLOR_MATCH_CONTEXT], GIT_COLOR_BOLD_RED);
+       color_set(opt->colors[GREP_COLOR_MATCH_SELECTED], GIT_COLOR_BOLD_RED);
+       color_set(opt->colors[GREP_COLOR_SELECTED], "");
+       color_set(opt->colors[GREP_COLOR_SEP], GIT_COLOR_CYAN);
        opt->color = -1;
        opt->output = std_output;
 }
@@ -76,7 +87,7 @@ static int parse_pattern_type_arg(const char *opt, const char 
*arg)
 int grep_config(const char *var, const char *value, void *cb)
 {
        struct grep_opt *opt = &grep_defaults;
-       char *color = NULL;
+       const char *slot;
 
        if (userdiff_config(var, value) < 0)
                return -1;
@@ -103,32 +114,18 @@ int grep_config(const char *var, const char *value, void 
*cb)
 
        if (!strcmp(var, "color.grep"))
                opt->color = git_config_colorbool(var, value);
-       else if (!strcmp(var, "color.grep.context"))
-               color = opt->color_context;
-       else if (!strcmp(var, "color.grep.filename"))
-               color = opt->color_filename;
-       else if (!strcmp(var, "color.grep.function"))
-               color = opt->color_function;
-       else if (!strcmp(var, "color.grep.linenumber"))
-               color = opt->color_lineno;
-       else if (!strcmp(var, "color.grep.matchcontext"))
-               color = opt->color_match_context;
-       else if (!strcmp(var, "color.grep.matchselected"))
-               color = opt->color_match_selected;
-       else if (!strcmp(var, "color.grep.selected"))
-               color = opt->color_selected;
-       else if (!strcmp(var, "color.grep.separator"))
-               color = opt->color_sep;
-       else if (!strcmp(var, "color.grep.match")) {
-               int rc = 0;
-               if (!value)
-                       return config_error_nonbool(var);
-               rc |= color_parse(value, opt->color_match_context);
-               rc |= color_parse(value, opt->color_match_selected);
-               return rc;
-       }
-
-       if (color) {
+       if (!strcmp(var, "color.grep.match")) {
+               if (grep_config("color.grep.matchcontext", value, cb) < 0)
+                       return -1;
+               if (grep_config("color.grep.matchselected", value, cb) < 0)
+                       return -1;
+       } else if (skip_prefix(var, "color.grep.", &slot)) {
+               int i = LOOKUP_CONFIG(color_grep_slots, slot);
+               char *color;
+
+               if (i < 0)
+                       return -1;
+               color = opt->colors[i];
                if (!value)
                        return config_error_nonbool(var);
                return color_parse(value, color);
@@ -144,6 +141,7 @@ int grep_config(const char *var, const char *value, void 
*cb)
 void grep_init(struct grep_opt *opt, const char *prefix)
 {
        struct grep_opt *def = &grep_defaults;
+       int i;
 
        memset(opt, 0, sizeof(*opt));
        opt->prefix = prefix;
@@ -160,14 +158,8 @@ void grep_init(struct grep_opt *opt, const char *prefix)
        opt->relative = def->relative;
        opt->output = def->output;
 
-       color_set(opt->color_context, def->color_context);
-       color_set(opt->color_filename, def->color_filename);
-       color_set(opt->color_function, def->color_function);
-       color_set(opt->color_lineno, def->color_lineno);
-       color_set(opt->color_match_context, def->color_match_context);
-       color_set(opt->color_match_selected, def->color_match_selected);
-       color_set(opt->color_selected, def->color_selected);
-       color_set(opt->color_sep, def->color_sep);
+       for (i = 0; i < NR_GREP_COLORS; i++)
+               color_set(opt->colors[i], def->colors[i]);
 }
 
 static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, 
struct grep_opt *opt)
@@ -1098,12 +1090,12 @@ static void output_sep(struct grep_opt *opt, char sign)
        if (opt->null_following_name)
                opt->output(opt, "\0", 1);
        else
-               output_color(opt, &sign, 1, opt->color_sep);
+               output_color(opt, &sign, 1, opt->colors[GREP_COLOR_SEP]);
 }
 
 static void show_name(struct grep_opt *opt, const char *name)
 {
-       output_color(opt, name, strlen(name), opt->color_filename);
+       output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
        opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
 }
 
@@ -1370,28 +1362,28 @@ static void show_line(struct grep_opt *opt, char *bol, 
char *eol,
        } else if (opt->pre_context || opt->post_context || opt->funcbody) {
                if (opt->last_shown == 0) {
                        if (opt->show_hunk_mark) {
-                               output_color(opt, "--", 2, opt->color_sep);
+                               output_color(opt, "--", 2, 
opt->colors[GREP_COLOR_SEP]);
                                opt->output(opt, "\n", 1);
                        }
                } else if (lno > opt->last_shown + 1) {
-                       output_color(opt, "--", 2, opt->color_sep);
+                       output_color(opt, "--", 2, opt->colors[GREP_COLOR_SEP]);
                        opt->output(opt, "\n", 1);
                }
        }
        if (opt->heading && opt->last_shown == 0) {
-               output_color(opt, name, strlen(name), opt->color_filename);
+               output_color(opt, name, strlen(name), 
opt->colors[GREP_COLOR_FILENAME]);
                opt->output(opt, "\n", 1);
        }
        opt->last_shown = lno;
 
        if (!opt->heading && opt->pathname) {
-               output_color(opt, name, strlen(name), opt->color_filename);
+               output_color(opt, name, strlen(name), 
opt->colors[GREP_COLOR_FILENAME]);
                output_sep(opt, sign);
        }
        if (opt->linenum) {
                char buf[32];
                xsnprintf(buf, sizeof(buf), "%d", lno);
-               output_color(opt, buf, strlen(buf), opt->color_lineno);
+               output_color(opt, buf, strlen(buf), 
opt->colors[GREP_COLOR_LINENO]);
                output_sep(opt, sign);
        }
        if (opt->color) {
@@ -1401,15 +1393,15 @@ static void show_line(struct grep_opt *opt, char *bol, 
char *eol,
                int eflags = 0;
 
                if (sign == ':')
-                       match_color = opt->color_match_selected;
+                       match_color = opt->colors[GREP_COLOR_MATCH_SELECTED];
                else
-                       match_color = opt->color_match_context;
+                       match_color = opt->colors[GREP_COLOR_MATCH_CONTEXT];
                if (sign == ':')
-                       line_color = opt->color_selected;
+                       line_color = opt->colors[GREP_COLOR_SELECTED];
                else if (sign == '-')
-                       line_color = opt->color_context;
+                       line_color = opt->colors[GREP_COLOR_CONTEXT];
                else if (sign == '=')
-                       line_color = opt->color_function;
+                       line_color = opt->colors[GREP_COLOR_FUNCTION];
                *eol = '\0';
                while (next_match(opt, bol, eol, ctx, &match, eflags)) {
                        if (match.rm_so == match.rm_eo)
@@ -1816,7 +1808,7 @@ static int grep_source_1(struct grep_opt *opt, struct 
grep_source *gs, int colle
                        if (binary_match_only) {
                                opt->output(opt, "Binary file ", 12);
                                output_color(opt, gs->name, strlen(gs->name),
-                                            opt->color_filename);
+                                            opt->colors[GREP_COLOR_FILENAME]);
                                opt->output(opt, " matches\n", 9);
                                return 1;
                        }
@@ -1890,7 +1882,7 @@ static int grep_source_1(struct grep_opt *opt, struct 
grep_source *gs, int colle
                char buf[32];
                if (opt->pathname) {
                        output_color(opt, gs->name, strlen(gs->name),
-                                    opt->color_filename);
+                                    opt->colors[GREP_COLOR_FILENAME]);
                        output_sep(opt, ':');
                }
                xsnprintf(buf, sizeof(buf), "%u\n", count);
diff --git a/grep.h b/grep.h
index 399381c908..ed25be271b 100644
--- a/grep.h
+++ b/grep.h
@@ -62,6 +62,18 @@ enum grep_header_field {
        GREP_HEADER_FIELD_MAX
 };
 
+enum grep_color {
+       GREP_COLOR_CONTEXT,
+       GREP_COLOR_FILENAME,
+       GREP_COLOR_FUNCTION,
+       GREP_COLOR_LINENO,
+       GREP_COLOR_MATCH_CONTEXT,
+       GREP_COLOR_MATCH_SELECTED,
+       GREP_COLOR_SELECTED,
+       GREP_COLOR_SEP,
+       NR_GREP_COLORS
+};
+
 struct grep_pat {
        struct grep_pat *next;
        const char *origin;
@@ -155,14 +167,7 @@ struct grep_opt {
        int funcbody;
        int extended_regexp_option;
        int pattern_type_option;
-       char color_context[COLOR_MAXLEN];
-       char color_filename[COLOR_MAXLEN];
-       char color_function[COLOR_MAXLEN];
-       char color_lineno[COLOR_MAXLEN];
-       char color_match_context[COLOR_MAXLEN];
-       char color_match_selected[COLOR_MAXLEN];
-       char color_selected[COLOR_MAXLEN];
-       char color_sep[COLOR_MAXLEN];
+       char colors[NR_GREP_COLORS][COLOR_MAXLEN];
        unsigned pre_context;
        unsigned post_context;
        unsigned last_shown;
-- 
2.17.0.705.g3525833791

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