diff options
| -rw-r--r-- | Documentation/diff-options.txt | 13 | ||||
| -rw-r--r-- | diff.c | 19 | ||||
| -rw-r--r-- | diff.h | 1 | ||||
| -rwxr-xr-x | t/t4022-diff-rewrite.sh | 43 |
4 files changed, 70 insertions, 6 deletions
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt index c93124be7..30a00d328 100644 --- a/Documentation/diff-options.txt +++ b/Documentation/diff-options.txt @@ -259,6 +259,19 @@ endif::git-log[] projects, so use it with caution. Giving more than one `-C` option has the same effect. +-D:: +--irreversible-delete:: + Omit the preimage for deletes, i.e. print only the header but not + the diff between the preimage and `/dev/null`. The resulting patch + is not meant to be applied with `patch` nor `git apply`; this is + solely for people who want to just concentrate on reviewing the + text after the change. In addition, the output obviously lack + enough information to apply such a patch in reverse, even manually, + hence the name of the option. ++ +When used together with `-B`, omit also the preimage in the deletion part +of a delete/create pair. + -l<num>:: The `-M` and `-C` options require O(n^2) processing time where n is the number of potential rename/copy targets. This @@ -572,11 +572,14 @@ 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); @@ -1943,7 +1946,11 @@ 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) @@ -1963,8 +1970,7 @@ 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; @@ -3160,6 +3166,9 @@ 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) @@ -104,6 +104,7 @@ struct diff_options { int interhunkcontext; int break_opt; int detect_rename; + int irreversible_delete; int skip_stat_unmatch; int line_termination; int output_format; diff --git a/t/t4022-diff-rewrite.sh b/t/t4022-diff-rewrite.sh index 2a537a21e..c00a94b9b 100755 --- a/t/t4022-diff-rewrite.sh +++ b/t/t4022-diff-rewrite.sh @@ -11,7 +11,9 @@ test_expect_success setup ' tr \ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \ "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM" \ - <"$TEST_DIRECTORY"/../COPYING >test + <"$TEST_DIRECTORY"/../COPYING >test && + echo "to be deleted" >test2 && + git add test2 ' @@ -25,5 +27,44 @@ test_expect_success 'detect rewrite' ' ' +cat >expect <<EOF +diff --git a/test2 b/test2 +deleted file mode 100644 +index 4202011..0000000 +--- a/test2 ++++ /dev/null +@@ -1 +0,0 @@ +-to be deleted +EOF +test_expect_success 'show deletion diff without -D' ' + + rm test2 && + git diff -- test2 >actual && + test_cmp expect actual +' + +cat >expect <<EOF +diff --git a/test2 b/test2 +deleted file mode 100644 +index 4202011..0000000 +EOF +test_expect_success 'suppress deletion diff with -D' ' + + git diff -D -- test2 >actual && + test_cmp expect actual +' + +test_expect_success 'show deletion diff with -B' ' + + git diff -B -- test >actual && + grep "Linus Torvalds" actual +' + +test_expect_success 'suppress deletion diff with -B -D' ' + + git diff -B -D -- test >actual && + grep -v "Linus Torvalds" actual +' + test_done |