From patchwork Tue Dec 26 20:20:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam James X-Patchwork-Id: 13505057 Received: from smtp.gentoo.org (woodpecker.gentoo.org [140.211.166.183]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E17BDF4E1 for ; Tue, 26 Dec 2023 20:21:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gentoo.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gentoo.org From: Sam James To: git@vger.kernel.org Cc: Sam James , Elijah Newren , Junio C Hamano Subject: [PATCH v2] diff: implement config.diff.renames=copies-harder Date: Tue, 26 Dec 2023 20:20:17 +0000 Message-ID: <20231226202102.3392518-1-sam@gentoo.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This patch adds a config value for 'diff.renames' called 'copies-harder' which make it so '-C -C' is in effect always passed for 'git log -p', 'git diff', etc. This allows specifying that 'git log -p', 'git diff', etc should always act as if '-C --find-copies-harder' was passed. It has proven this especially useful for certain types of repository (like Gentoo's ebuild repositories) because files are often copies of a previous version: Suppose a directory 'sys-devel/gcc' contains recipes for building GCC, with one file for each supported upstream branch: gcc-13.x.build.recipe gcc-12.x.build.recipe gcc-11.x.build.recipe gcc-10.x.build.recipe gcc-13.x.build.recipe was started as a copy of gcc-12.x.build.recipe (which was started as a copy of gcc-11.x.build.recipe, etc.). Previous versions are kept around to support parallel installation of multiple versions. Being able to easily observe the diff relative to other recipes within the directory has been a quality of life improvement for such repo layouts. Cc: Elijah Newren Cc: Junio C Hamano Signed-off-by: Sam James --- v2: Improve the commit message using Elijah Newren's example (it is indeed precisely what I was thinking of, but phrased better), and improve the documentation to explain better what the new config option actually does & refer to git-diff's --find-copies-harder. Documentation/config/diff.txt | 8 +++++--- Documentation/config/status.txt | 3 ++- diff.c | 12 +++++++++--- diff.h | 1 + diffcore-rename.c | 4 ++-- merge-ort.c | 2 +- merge-recursive.c | 2 +- 7 files changed, 21 insertions(+), 11 deletions(-) diff --git a/Documentation/config/diff.txt b/Documentation/config/diff.txt index bd5ae0c337..cdd8a74ec0 100644 --- a/Documentation/config/diff.txt +++ b/Documentation/config/diff.txt @@ -131,9 +131,11 @@ diff.renames:: Whether and how Git detects renames. If set to "false", rename detection is disabled. If set to "true", basic rename detection is enabled. If set to "copies" or "copy", Git will - detect copies, as well. Defaults to true. Note that this - affects only 'git diff' Porcelain like linkgit:git-diff[1] and - linkgit:git-log[1], and not lower level commands such as + detect copies, as well. If set to "copies-harder", Git will spend extra + cycles to find more copies even in unmodified paths, see + '--find-copies-harder' in linkgit:git-diff[1]. Defaults to true. + Note that this affects only 'git diff' Porcelain like linkgit:git-diff[1] + and linkgit:git-log[1], and not lower level commands such as linkgit:git-diff-files[1]. diff.suppressBlankEmpty:: diff --git a/Documentation/config/status.txt b/Documentation/config/status.txt index 2ff8237f8f..7ca7a4becd 100644 --- a/Documentation/config/status.txt +++ b/Documentation/config/status.txt @@ -33,7 +33,8 @@ status.renames:: Whether and how Git detects renames in linkgit:git-status[1] and linkgit:git-commit[1] . If set to "false", rename detection is disabled. If set to "true", basic rename detection is enabled. - If set to "copies" or "copy", Git will detect copies, as well. + If set to "copies" or "copy", Git will detect copies, as well. If + set to "copies-harder", Git will try harder to detect copies. Defaults to the value of diff.renames. status.showStash:: diff --git a/diff.c b/diff.c index a2def45644..585acf9a99 100644 --- a/diff.c +++ b/diff.c @@ -206,8 +206,11 @@ int git_config_rename(const char *var, const char *value) { if (!value) return DIFF_DETECT_RENAME; + if (!strcasecmp(value, "copies-harder")) + return DIFF_DETECT_COPY_HARDER; if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy")) - return DIFF_DETECT_COPY; + return DIFF_DETECT_COPY; + return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0; } @@ -4849,8 +4852,11 @@ void diff_setup_done(struct diff_options *options) else options->flags.diff_from_contents = 0; - if (options->flags.find_copies_harder) + /* Just fold this in as it makes the patch-to-git smaller */ + if (options->flags.find_copies_harder || options->detect_rename == DIFF_DETECT_COPY_HARDER) { + options->flags.find_copies_harder = 1; options->detect_rename = DIFF_DETECT_COPY; + } if (!options->flags.relative_name) options->prefix = NULL; @@ -5281,7 +5287,7 @@ static int diff_opt_find_copies(const struct option *opt, if (*arg != 0) return error(_("invalid argument to %s"), opt->long_name); - if (options->detect_rename == DIFF_DETECT_COPY) + if (options->detect_rename == DIFF_DETECT_COPY || options->detect_rename == DIFF_DETECT_COPY_HARDER) options->flags.find_copies_harder = 1; else options->detect_rename = DIFF_DETECT_COPY; diff --git a/diff.h b/diff.h index 66bd8aeb29..b29e5b777f 100644 --- a/diff.h +++ b/diff.h @@ -555,6 +555,7 @@ int git_config_rename(const char *var, const char *value); #define DIFF_DETECT_RENAME 1 #define DIFF_DETECT_COPY 2 +#define DIFF_DETECT_COPY_HARDER 3 #define DIFF_PICKAXE_ALL 1 #define DIFF_PICKAXE_REGEX 2 diff --git a/diffcore-rename.c b/diffcore-rename.c index 5a6e2bcac7..856291d66f 100644 --- a/diffcore-rename.c +++ b/diffcore-rename.c @@ -299,7 +299,7 @@ static int find_identical_files(struct hashmap *srcs, } /* Give higher scores to sources that haven't been used already */ score = !source->rename_used; - if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY) + if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY && options->detect_rename != DIFF_DETECT_COPY_HARDER) continue; score += basename_same(source, target); if (score > best_score) { @@ -1405,7 +1405,7 @@ void diffcore_rename_extended(struct diff_options *options, trace2_region_enter("diff", "setup", options->repo); info.setup = 0; assert(!dir_rename_count || strmap_empty(dir_rename_count)); - want_copies = (detect_rename == DIFF_DETECT_COPY); + want_copies = (detect_rename == DIFF_DETECT_COPY || detect_rename == DIFF_DETECT_COPY_HARDER); if (dirs_removed && (break_idx || want_copies)) BUG("dirs_removed incompatible with break/copy detection"); if (break_idx && relevant_sources) diff --git a/merge-ort.c b/merge-ort.c index 6491070d96..7749835465 100644 --- a/merge-ort.c +++ b/merge-ort.c @@ -4782,7 +4782,7 @@ static void merge_start(struct merge_options *opt, struct merge_result *result) * sanity check them anyway. */ assert(opt->detect_renames >= -1 && - opt->detect_renames <= DIFF_DETECT_COPY); + opt->detect_renames <= DIFF_DETECT_COPY_HARDER); assert(opt->verbosity >= 0 && opt->verbosity <= 5); assert(opt->buffer_output <= 2); assert(opt->obuf.len == 0); diff --git a/merge-recursive.c b/merge-recursive.c index e3beb0801b..d52dd53660 100644 --- a/merge-recursive.c +++ b/merge-recursive.c @@ -3708,7 +3708,7 @@ static int merge_start(struct merge_options *opt, struct tree *head) assert(opt->branch1 && opt->branch2); assert(opt->detect_renames >= -1 && - opt->detect_renames <= DIFF_DETECT_COPY); + opt->detect_renames <= DIFF_DETECT_COPY_HARDER); assert(opt->detect_directory_renames >= MERGE_DIRECTORY_RENAMES_NONE && opt->detect_directory_renames <= MERGE_DIRECTORY_RENAMES_TRUE); assert(opt->rename_limit >= -1);