From c9e1f2c7f2acca17c629255b96761a4a1047a28a Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Wed, 25 Mar 2015 16:11:39 -0700 Subject: [PATCH 1/2] diff-no-index: DWIM "diff D F" into "diff D/F F" "git diff --no-index" was supposed to be a poor-man's approach to allow using Git diff goodies outside of a Git repository, without having to patch mainstream diff implementations. Unlike a POSIX diff that treats "diff D F" (or "diff F D") as a request to compare D/F and F (or F and D/F) when D is a directory and F is a file, however, we did not accept such a command line and instead barfed with "file/directory conflict". Imitate what POSIX diff does and append the basename of the file after the name of the directory before comparing. Signed-off-by: Junio C Hamano --- diff-no-index.c | 43 ++++++++++++++++++++++++++++++++++++++++ t/t4053-diff-no-index.sh | 22 ++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/diff-no-index.c b/diff-no-index.c index 265709ba8c5..49c4536d1d2 100644 --- a/diff-no-index.c +++ b/diff-no-index.c @@ -182,12 +182,50 @@ static int queue_diff(struct diff_options *o, } } +/* append basename of F to D */ +static void append_basename(struct strbuf *path, const char *dir, const char *file) +{ + const char *tail = strrchr(file, '/'); + + strbuf_addstr(path, dir); + while (path->len && path->buf[path->len - 1] == '/') + path->len--; + strbuf_addch(path, '/'); + strbuf_addstr(path, tail ? tail + 1 : file); +} + +/* + * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F" + * Note that we append the basename of F to D/, so "diff a/b/file D" + * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file". + */ +static void fixup_paths(const char **path, struct strbuf *replacement) +{ + unsigned int isdir0, isdir1; + + if (path[0] == file_from_standard_input || + path[1] == file_from_standard_input) + return; + isdir0 = is_directory(path[0]); + isdir1 = is_directory(path[1]); + if (isdir0 == isdir1) + return; + if (isdir0) { + append_basename(replacement, path[0], path[1]); + path[0] = replacement->buf; + } else { + append_basename(replacement, path[1], path[0]); + path[1] = replacement->buf; + } +} + void diff_no_index(struct rev_info *revs, int argc, const char **argv, const char *prefix) { int i, prefixlen; const char *paths[2]; + struct strbuf replacement = STRBUF_INIT; diff_setup(&revs->diffopt); for (i = 1; i < argc - 2; ) { @@ -217,6 +255,9 @@ void diff_no_index(struct rev_info *revs, p = xstrdup(prefix_filename(prefix, prefixlen, p)); paths[i] = p; } + + fixup_paths(paths, &replacement); + revs->diffopt.skip_stat_unmatch = 1; if (!revs->diffopt.output_format) revs->diffopt.output_format = DIFF_FORMAT_PATCH; @@ -235,6 +276,8 @@ void diff_no_index(struct rev_info *revs, diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); + strbuf_release(&replacement); + /* * The return code for --no-index imitates diff(1): * 0 = no changes, 1 = changes, else error diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh index 2ab3c487340..01eca4c2780 100755 --- a/t/t4053-diff-no-index.sh +++ b/t/t4053-diff-no-index.sh @@ -55,4 +55,26 @@ test_expect_success 'git diff --no-index executed outside repo gives correct err ) ' +test_expect_success 'diff D F and diff F D' ' + ( + cd repo && + echo in-repo >a && + echo non-repo >../non/git/a && + mkdir sub && + echo sub-repo >sub/a && + + test_must_fail git diff --no-index sub/a ../non/git/a >expect && + test_must_fail git diff --no-index sub/a ../non/git/ >actual && + test_cmp expect actual && + + test_must_fail git diff --no-index a ../non/git/a >expect && + test_must_fail git diff --no-index a ../non/git/ >actual && + test_cmp expect actual && + + test_must_fail git diff --no-index ../non/git/a a >expect && + test_must_fail git diff --no-index ../non/git a >actual && + test_cmp expect actual + ) +' + test_done From 06151739988601b0fe6179c6c67a0031b85b536f Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sat, 21 Mar 2015 22:11:27 -0700 Subject: [PATCH 2/2] diff-no-index: align D/F handling with that of normal Git When a commit changes a path P that used to be a file to a directory and creates a new path P/X in it, "git show" would say that file P was removed and file P/X was created for such a commit. However, if we compare two directories, D1 and D2, where D1 has a file D1/P in it and D2 has a directory D2/P under which there is a file D2/P/X, and ask "git diff --no-index D1 D2" to show their differences, we simply get a refusal "file/directory conflict". Surely, that may be what GNU diff does, but we can do better and it is easy to do so. Signed-off-by: Junio C Hamano --- diff-no-index.c | 23 +++++++++++++++++++++-- t/t4053-diff-no-index.sh | 12 ++++++++++++ 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/diff-no-index.c b/diff-no-index.c index 49c4536d1d2..0320605a841 100644 --- a/diff-no-index.c +++ b/diff-no-index.c @@ -97,8 +97,27 @@ static int queue_diff(struct diff_options *o, if (get_mode(name1, &mode1) || get_mode(name2, &mode2)) return -1; - if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) - return error("file/directory conflict: %s, %s", name1, name2); + if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) { + struct diff_filespec *d1, *d2; + + if (S_ISDIR(mode1)) { + /* 2 is file that is created */ + d1 = noindex_filespec(NULL, 0); + d2 = noindex_filespec(name2, mode2); + name2 = NULL; + mode2 = 0; + } else { + /* 1 is file that is deleted */ + d1 = noindex_filespec(name1, mode1); + d2 = noindex_filespec(NULL, 0); + name1 = NULL; + mode1 = 0; + } + /* emit that file */ + diff_queue(&diff_queued_diff, d1, d2); + + /* and then let the entire directory be created or deleted */ + } if (S_ISDIR(mode1) || S_ISDIR(mode2)) { struct strbuf buffer1 = STRBUF_INIT; diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh index 01eca4c2780..596dfe712d5 100755 --- a/t/t4053-diff-no-index.sh +++ b/t/t4053-diff-no-index.sh @@ -77,4 +77,16 @@ test_expect_success 'diff D F and diff F D' ' ) ' +test_expect_success 'turning a file into a directory' ' + ( + cd non/git && + mkdir d e e/sub && + echo 1 >d/sub && + echo 2 >e/sub/file && + printf "D\td/sub\nA\te/sub/file\n" >expect && + test_must_fail git diff --no-index --name-status d e >actual && + test_cmp expect actual + ) +' + test_done