diff: add configuration option for disabling diff prefixes.

With new configuration "diff.noprefix", "git diff" does not show a source or destination prefix ala "git diff --no-prefix".

Signed-off-by: Eli Collins <eli@cloudera.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index e5aa2cacfadc79a985a9178ea121c0078565c0d9..93ab49772c1a537de8b32fa1f63530f20f092d3f 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -798,6 +798,8 @@ diff.mnemonicprefix::
        standard "a/" and "b/" depending on what is being compared.  When
        this configuration is in effect, reverse diff output also swaps
        the order of the prefixes:
+diff.noprefix::
+       If set, 'git diff' does not show any source or destination prefix.
 `git diff`;;
        compares the (i)ndex and the (w)ork tree;
 `git diff HEAD`;;

diff --git a/diff.c b/diff.c
index e49f14a92442117a8e8424bd7a750dc4fda5cab2..6d9928cb968417d5d0e83f07acf22ed2705db567 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -30,6 +30,7 @@ static const char *diff_word_regex_cfg;
 static const char *external_diff_cmd_cfg;
 int diff_auto_refresh_index = 1;
 static int diff_mnemonic_prefix;
+static int diff_no_prefix;
 
 static char diff_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_RESET,
@@ -101,6 +102,10 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
                diff_mnemonic_prefix = git_config_bool(var, value);
                return 0;
        }
+       if (!strcmp(var, "diff.noprefix")) {
+               diff_no_prefix = git_config_bool(var, value);
+               return 0;
+       }
        if (!strcmp(var, "diff.external"))
                return git_config_string(&external_diff_cmd_cfg, var, value);
        if (!strcmp(var, "diff.wordregex"))
@@ -2538,7 +2543,9 @@ void diff_setup(struct diff_options *options)
                DIFF_OPT_SET(options, COLOR_DIFF);
        options->detect_rename = diff_detect_rename_default;
 
-       if (!diff_mnemonic_prefix) {
+       if (diff_no_prefix) {
+               options->a_prefix = options->b_prefix = "";
+       } else if (!diff_mnemonic_prefix) {
                options->a_prefix = "a/";
                options->b_prefix = "b/";
        }