Code

t/README: start testing porcelainish
[git.git] / diff.c
diff --git a/diff.c b/diff.c
index 9e9cfc8b75b7b761980b0d32cb0c516ea3505ba3..fbb6c26cd9266e0ae453bb6c321f52d4996446a6 100644 (file)
--- a/diff.c
+++ b/diff.c
 
 static int use_size_cache;
 
-int diff_rename_limit_default = -1;
+static int diff_rename_limit_default = -1;
+static int diff_use_color_default = 0;
+
+enum color_diff {
+       DIFF_RESET = 0,
+       DIFF_PLAIN = 1,
+       DIFF_METAINFO = 2,
+       DIFF_FRAGINFO = 3,
+       DIFF_FILE_OLD = 4,
+       DIFF_FILE_NEW = 5,
+};
+
+#define COLOR_NORMAL  ""
+#define COLOR_BOLD    "\033[1m"
+#define COLOR_DIM     "\033[2m"
+#define COLOR_UL      "\033[4m"
+#define COLOR_BLINK   "\033[5m"
+#define COLOR_REVERSE "\033[7m"
+#define COLOR_RESET   "\033[m"
+
+#define COLOR_BLACK   "\033[30m"
+#define COLOR_RED     "\033[31m"
+#define COLOR_GREEN   "\033[32m"
+#define COLOR_YELLOW  "\033[33m"
+#define COLOR_BLUE    "\033[34m"
+#define COLOR_MAGENTA "\033[35m"
+#define COLOR_CYAN    "\033[36m"
+#define COLOR_WHITE   "\033[37m"
+
+static const char *diff_colors[] = {
+       [DIFF_RESET]    = COLOR_RESET,
+       [DIFF_PLAIN]    = COLOR_NORMAL,
+       [DIFF_METAINFO] = COLOR_BOLD,
+       [DIFF_FRAGINFO] = COLOR_CYAN,
+       [DIFF_FILE_OLD] = COLOR_RED,
+       [DIFF_FILE_NEW] = COLOR_GREEN,
+};
+
+static int parse_diff_color_slot(const char *var, int ofs)
+{
+       if (!strcasecmp(var+ofs, "plain"))
+               return DIFF_PLAIN;
+       if (!strcasecmp(var+ofs, "meta"))
+               return DIFF_METAINFO;
+       if (!strcasecmp(var+ofs, "frag"))
+               return DIFF_FRAGINFO;
+       if (!strcasecmp(var+ofs, "old"))
+               return DIFF_FILE_OLD;
+       if (!strcasecmp(var+ofs, "new"))
+               return DIFF_FILE_NEW;
+       die("bad config variable '%s'", var);
+}
+
+static const char *parse_diff_color_value(const char *value, const char *var)
+{
+       if (!strcasecmp(value, "normal"))
+               return COLOR_NORMAL;
+       if (!strcasecmp(value, "bold"))
+               return COLOR_BOLD;
+       if (!strcasecmp(value, "dim"))
+               return COLOR_DIM;
+       if (!strcasecmp(value, "ul"))
+               return COLOR_UL;
+       if (!strcasecmp(value, "blink"))
+               return COLOR_BLINK;
+       if (!strcasecmp(value, "reverse"))
+               return COLOR_REVERSE;
+       if (!strcasecmp(value, "reset"))
+               return COLOR_RESET;
+       if (!strcasecmp(value, "black"))
+               return COLOR_BLACK;
+       if (!strcasecmp(value, "red"))
+               return COLOR_RED;
+       if (!strcasecmp(value, "green"))
+               return COLOR_GREEN;
+       if (!strcasecmp(value, "yellow"))
+               return COLOR_YELLOW;
+       if (!strcasecmp(value, "blue"))
+               return COLOR_BLUE;
+       if (!strcasecmp(value, "magenta"))
+               return COLOR_MAGENTA;
+       if (!strcasecmp(value, "cyan"))
+               return COLOR_CYAN;
+       if (!strcasecmp(value, "white"))
+               return COLOR_WHITE;
+       die("bad config value '%s' for variable '%s'", value, var);
+}
 
 int git_diff_config(const char *var, const char *value)
 {
@@ -21,7 +107,24 @@ int git_diff_config(const char *var, const char *value)
                diff_rename_limit_default = git_config_int(var, value);
                return 0;
        }
-
+       if (!strcmp(var, "diff.color")) {
+               if (!value)
+                       diff_use_color_default = 1; /* bool */
+               else if (!strcasecmp(value, "auto"))
+                       diff_use_color_default = isatty(1);
+               else if (!strcasecmp(value, "never"))
+                       diff_use_color_default = 0;
+               else if (!strcasecmp(value, "always"))
+                       diff_use_color_default = 1;
+               else
+                       diff_use_color_default = git_config_bool(var, value);
+               return 0;
+       }
+       if (!strncmp(var, "diff.color.", 11)) {
+               int slot = parse_diff_color_slot(var, 11);
+               diff_colors[slot] = parse_diff_color_value(value, var);
+               return 0;
+       }
        return git_default_config(var, value);
 }
 
@@ -165,7 +268,7 @@ static void emit_rewrite_diff(const char *name_a,
 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one)) {
-               mf->ptr = ""; /* does not matter */
+               mf->ptr = (char *)""; /* does not matter */
                mf->size = 0;
                return 0;
        }
@@ -177,23 +280,56 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
 }
 
 struct emit_callback {
+       struct xdiff_emit_state xm;
+       int nparents, color_diff;
        const char **label_path;
 };
 
-static int fn_out(void *priv, mmbuffer_t *mb, int nbuf)
+static inline const char *get_color(int diff_use_color, enum color_diff ix)
+{
+       if (diff_use_color)
+               return diff_colors[ix];
+       return "";
+}
+
+static void fn_out_consume(void *priv, char *line, unsigned long len)
 {
        int i;
        struct emit_callback *ecbdata = priv;
+       const char *set = get_color(ecbdata->color_diff, DIFF_METAINFO);
+       const char *reset = get_color(ecbdata->color_diff, DIFF_RESET);
 
        if (ecbdata->label_path[0]) {
-               printf("--- %s\n", ecbdata->label_path[0]);
-               printf("+++ %s\n", ecbdata->label_path[1]);
+               printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
+               printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
                ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
        }
-       for (i = 0; i < nbuf; i++)
-               if (!fwrite(mb[i].ptr, mb[i].size, 1, stdout))
-                       return -1;
-       return 0;
+
+       /* This is not really necessary for now because
+        * this codepath only deals with two-way diffs.
+        */
+       for (i = 0; i < len && line[i] == '@'; i++)
+               ;
+       if (2 <= i && i < len && line[i] == ' ') {
+               ecbdata->nparents = i - 1;
+               set = get_color(ecbdata->color_diff, DIFF_FRAGINFO);
+       }
+       else if (len < ecbdata->nparents)
+               set = reset;
+       else {
+               int nparents = ecbdata->nparents;
+               int color = DIFF_PLAIN;
+               for (i = 0; i < nparents && len; i++) {
+                       if (line[i] == '-')
+                               color = DIFF_FILE_OLD;
+                       else if (line[i] == '+')
+                               color = DIFF_FILE_NEW;
+               }
+               set = get_color(ecbdata->color_diff, color);
+       }
+       if (len > 0 && line[len-1] == '\n')
+               len--;
+       printf("%s%.*s%s\n", set, (int) len, line, reset);
 }
 
 static char *pprint_rename(const char *a, const char *b)
@@ -324,7 +460,7 @@ static void show_stats(struct diffstat_t* data)
        }
 
        for (i = 0; i < data->nr; i++) {
-               char *prefix = "";
+               const char *prefix = "";
                char *name = data->files[i]->name;
                int added = data->files[i]->added;
                int deleted = data->files[i]->deleted;
@@ -515,7 +651,7 @@ static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
                else
                        line[0] = bytes - 26 + 'a' - 1;
                encode_85(line + 1, cp, bytes);
-               cp += bytes;
+               cp = (char *) cp + bytes;
                puts(line);
        }
        printf("\n");
@@ -544,30 +680,32 @@ static void builtin_diff(const char *name_a,
        mmfile_t mf1, mf2;
        const char *lbl[2];
        char *a_one, *b_two;
+       const char *set = get_color(o->color_diff, DIFF_METAINFO);
+       const char *reset = get_color(o->color_diff, DIFF_RESET);
 
        a_one = quote_two("a/", name_a);
        b_two = quote_two("b/", name_b);
        lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
        lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
-       printf("diff --git %s %s\n", a_one, b_two);
+       printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
        if (lbl[0][0] == '/') {
                /* /dev/null */
-               printf("new file mode %06o\n", two->mode);
+               printf("%snew file mode %06o%s\n", set, two->mode, reset);
                if (xfrm_msg && xfrm_msg[0])
-                       puts(xfrm_msg);
+                       printf("%s%s%s\n", set, xfrm_msg, reset);
        }
        else if (lbl[1][0] == '/') {
-               printf("deleted file mode %06o\n", one->mode);
+               printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
                if (xfrm_msg && xfrm_msg[0])
-                       puts(xfrm_msg);
+                       printf("%s%s%s\n", set, xfrm_msg, reset);
        }
        else {
                if (one->mode != two->mode) {
-                       printf("old mode %06o\n", one->mode);
-                       printf("new mode %06o\n", two->mode);
+                       printf("%sold mode %06o%s\n", set, one->mode, reset);
+                       printf("%snew mode %06o%s\n", set, two->mode, reset);
                }
                if (xfrm_msg && xfrm_msg[0])
-                       puts(xfrm_msg);
+                       printf("%s%s%s\n", set, xfrm_msg, reset);
                /*
                 * we do not run diff between different kind
                 * of objects.
@@ -602,8 +740,10 @@ static void builtin_diff(const char *name_a,
                xdemitcb_t ecb;
                struct emit_callback ecbdata;
 
+               memset(&ecbdata, 0, sizeof(ecbdata));
                ecbdata.label_path = lbl;
-               xpp.flags = XDF_NEED_MINIMAL;
+               ecbdata.color_diff = o->color_diff;
+               xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
                xecfg.ctxlen = o->context;
                xecfg.flags = XDL_EMIT_FUNCNAMES;
                if (!diffopts)
@@ -612,8 +752,9 @@ static void builtin_diff(const char *name_a,
                        xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
                else if (!strncmp(diffopts, "-u", 2))
                        xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
-               ecb.outf = fn_out;
+               ecb.outf = xdiff_outf;
                ecb.priv = &ecbdata;
+               ecbdata.xm.consume = fn_out_consume;
                xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
        }
 
@@ -627,6 +768,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                             struct diff_filespec *one,
                             struct diff_filespec *two,
                             struct diffstat_t *diffstat,
+                            struct diff_options *o,
                             int complete_rewrite)
 {
        mmfile_t mf1, mf2;
@@ -656,7 +798,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                xdemitconf_t xecfg;
                xdemitcb_t ecb;
 
-               xpp.flags = XDF_NEED_MINIMAL;
+               xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
                xecfg.ctxlen = 0;
                xecfg.flags = 0;
                ecb.outf = xdiff_outf;
@@ -841,7 +983,7 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                        err_empty:
                                err = -1;
                        empty:
-                               s->data = "";
+                               s->data = (char *)"";
                                s->size = 0;
                                return err;
                        }
@@ -1241,7 +1383,7 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
 
        if (DIFF_PAIR_UNMERGED(p)) {
                /* unmerged */
-               builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, 0);
+               builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
                return;
        }
 
@@ -1253,7 +1395,7 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
 
        if (p->status == DIFF_STATUS_MODIFIED && p->score)
                complete_rewrite = 1;
-       builtin_diffstat(name, other, p->one, p->two, diffstat, complete_rewrite);
+       builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
 }
 
 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
@@ -1286,6 +1428,7 @@ void diff_setup(struct diff_options *options)
 
        options->change = diff_change;
        options->add_remove = diff_addremove;
+       options->color_diff = diff_use_color_default;
 }
 
 int diff_setup_done(struct diff_options *options)
@@ -1332,7 +1475,7 @@ int diff_setup_done(struct diff_options *options)
        return 0;
 }
 
-int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
+static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
 {
        char c, *eq;
        int len;
@@ -1456,6 +1599,12 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                else if (40 < options->abbrev)
                        options->abbrev = 40;
        }
+       else if (!strcmp(arg, "--color"))
+               options->color_diff = 1;
+       else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
+               options->xdl_opts |= XDF_IGNORE_WHITESPACE;
+       else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
+               options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
        else
                return 0;
        return 1;
@@ -1642,16 +1791,12 @@ static void diff_flush_raw(struct diff_filepair *p,
                free((void*)path_two);
 }
 
-static void diff_flush_name(struct diff_filepair *p,
-                           int inter_name_termination,
-                           int line_termination)
+static void diff_flush_name(struct diff_filepair *p, int line_termination)
 {
        char *path = p->two->path;
 
        if (line_termination)
                path = quote_one(p->two->path);
-       else
-               path = p->two->path;
        printf("%s%c", path, line_termination);
        if (p->two->path != path)
                free(path);
@@ -1872,9 +2017,7 @@ static void flush_one_pair(struct diff_filepair *p,
                                       options, diff_output_format);
                        break;
                case DIFF_FORMAT_NAME:
-                       diff_flush_name(p,
-                                       inter_name_termination,
-                                       line_termination);
+                       diff_flush_name(p, line_termination);
                        break;
                case DIFF_FORMAT_NO_OUTPUT:
                        break;