git-sh-i18n--envsubst: our own envsubst(1) for eval_gettext()

[git.git] / diff.c

diff --git a/diff.c b/diff.c
index 5376d01e1b26f0297e20f14bd8adcfefd374ab08..feced343433f41c2138f09e10e256b2020c89137 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -581,11 +581,14 @@ static void emit_rewrite_diff(const char *name_a,
                line_prefix, metainfo, a_name.buf, name_a_tab, reset,
                line_prefix, metainfo, b_name.buf, name_b_tab, reset,
                line_prefix, fraginfo);
-       print_line_count(o->file, lc_a);
+       if (!o->irreversible_delete)
+               print_line_count(o->file, lc_a);
+       else
+               fprintf(o->file, "?,?");
        fprintf(o->file, " +");
        print_line_count(o->file, lc_b);
        fprintf(o->file, " @@%s\n", reset);
-       if (lc_a)
+       if (lc_a && !o->irreversible_delete)
                emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
        if (lc_b)
                emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
@@ -1981,7 +1984,11 @@ static void builtin_diff(const char *name_a,
                }
        }
 
-       if (!DIFF_OPT_TST(o, TEXT) &&
+       if (o->irreversible_delete && lbl[1][0] == '/') {
+               fprintf(o->file, "%s", header.buf);
+               strbuf_reset(&header);
+               goto free_ab_and_return;
+       } else if (!DIFF_OPT_TST(o, TEXT) &&
            ( (!textconv_one && diff_filespec_is_binary(one)) ||
              (!textconv_two && diff_filespec_is_binary(two)) )) {
                if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
@@ -2001,8 +2008,7 @@ static void builtin_diff(const char *name_a,
                        fprintf(o->file, "%sBinary files %s and %s differ\n",
                                line_prefix, lbl[0], lbl[1]);
                o->found_changes = 1;
-       }
-       else {
+       } else {
                /* Crazy xdl interfaces.. */
                const char *diffopts = getenv("GIT_DIFF_OPTS");
                xpparam_t xpp;
@@ -3200,6 +3206,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                        return error("invalid argument to -M: %s", arg+2);
                options->detect_rename = DIFF_DETECT_RENAME;
        }
+       else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
+               options->irreversible_delete = 1;
+       }
        else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
                 !strcmp(arg, "--find-copies")) {
                if (options->detect_rename == DIFF_DETECT_COPY)
@@ -3987,6 +3996,28 @@ static int is_summary_empty(const struct diff_queue_struct *q)
        return 1;
 }
 
+static const char rename_limit_warning[] =
+"inexact rename detection was skipped due to too many files.";
+
+static const char degrade_cc_to_c_warning[] =
+"only found copies from modified paths due to too many files.";
+
+static const char rename_limit_advice[] =
+"you may want to set your %s variable to at least "
+"%d and retry the command.";
+
+void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
+{
+       if (degraded_cc)
+               warning(degrade_cc_to_c_warning);
+       else if (needed)
+               warning(rename_limit_warning);
+       else
+               return;
+       if (0 < needed && needed < 32767)
+               warning(rename_limit_advice, varname, needed);
+}
+
 void diff_flush(struct diff_options *options)
 {
        struct diff_queue_struct *q = &diff_queued_diff;
@@ -4268,6 +4299,10 @@ void diffcore_std(struct diff_options *options)
 int diff_result_code(struct diff_options *opt, int status)
 {
        int result = 0;
+
+       diff_warn_rename_limit("diff.renamelimit",
+                              opt->needed_rename_limit,
+                              opt->degraded_cc_to_c);
        if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
            !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
                return status;
@@ -4381,20 +4416,20 @@ void diff_change(struct diff_options *options,
                DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
-void diff_unmerge(struct diff_options *options,
-                 const char *path,
-                 unsigned mode, const unsigned char *sha1)
+struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
 {
+       struct diff_filepair *pair;
        struct diff_filespec *one, *two;
 
        if (options->prefix &&
            strncmp(path, options->prefix, options->prefix_length))
-               return;
+               return NULL;
 
        one = alloc_filespec(path);
        two = alloc_filespec(path);
-       fill_filespec(one, sha1, mode);
-       diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
+       pair = diff_queue(&diff_queued_diff, one, two);
+       pair->is_unmerged = 1;
+       return pair;
 }
 
 static char *run_textconv(const char *pgm, struct diff_filespec *spec,