From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-6.0 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,RCVD_IN_SORBS_SPAM, RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id CC7C6207EC for ; Sun, 25 Sep 2016 08:58:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S940135AbcIYI6L (ORCPT ); Sun, 25 Sep 2016 04:58:11 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:27797 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753023AbcIYI6J (ORCPT ); Sun, 25 Sep 2016 04:58:09 -0400 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u8P8tLNw011983 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 25 Sep 2016 08:55:22 GMT Received: from lenuta.oracle.com (dhcp-ukc1-twvpn-2-vpnpool-10-175-214-67.vpn.oracle.com [10.175.214.67]) by aserv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u8P8tJZW011922; Sun, 25 Sep 2016 08:55:19 GMT From: Vegard Nossum To: git@vger.kernel.org Cc: Junio C Hamano , =?UTF-8?q?Santi=20B=C3=A9jar?= , Kevin Bracey , Philip Oakley , Vegard Nossum Subject: [RFC PATCH v2] revision: new rev^-n shorthand for rev^n..rev Date: Sun, 25 Sep 2016 10:55:11 +0200 Message-Id: <20160925085511.12515-1-vegard.nossum@oracle.com> X-Mailer: git-send-email 2.10.0.rc0.1.g07c9292 X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org I use rev^..rev daily, and I'm surely not the only one. To save typing (or copy-pasting, if the rev is long -- like a full SHA-1 or branch name) we can make rev^- a shorthand for that. The existing syntax rev^! seems like it should do the same, but it doesn't really do the right thing for merge commits (it gives only the merge itself). As a natural generalisation, we also accept rev^-n where n excludes the nth parent of rev, although this is expected to be generally less useful. [v2: Use ^- instead of % as suggested by Junio Hamano and use some common helper functions for parsing.] Signed-off-by: Vegard Nossum --- Documentation/revisions.txt | 14 +++++++ builtin/rev-parse.c | 28 ++++++++++++++ revision.c | 91 +++++++++++++++++++++++++++++++++++++++++++++ revision.h | 1 + 4 files changed, 134 insertions(+) diff --git Documentation/revisions.txt Documentation/revisions.txt index 4bed5b1..6e33801 100644 --- Documentation/revisions.txt +++ Documentation/revisions.txt @@ -281,6 +281,14 @@ is a shorthand for 'HEAD..origin' and asks "What did the origin do since I forked from them?" Note that '..' would mean 'HEAD..HEAD' which is an empty range that is both reachable and unreachable from HEAD. +Parent Exclusion Notation +~~~~~~~~~~~~~~~~~~~~~~~~~ +The '{caret}-{}', Parent Exclusion Notation:: +Shorthand for '{caret}..', with '' = 1 if not +given. This is typically useful for merge commits where you +can just pass '{caret}-' to get all the commits in the branch +that was merged in merge commit ''. + Other {caret} Parent Shorthand Notations ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Two other shorthands exist, particularly useful for merge commits, @@ -316,6 +324,10 @@ Revision Range Summary but exclude those that are reachable from both. When either or is omitted, it defaults to `HEAD`. +'{caret}-{}', e.g. 'HEAD{caret}, HEAD{caret}-2':: + Equivalent to '{caret}..', with '' = 1 if not + given. + '{caret}@', e.g. 'HEAD{caret}@':: A suffix '{caret}' followed by an at sign is the same as listing all parents of '' (meaning, include anything reachable from @@ -339,6 +351,8 @@ spelt out: C I J F C B..C = ^B C C B...C = B ^F C G H D E B C + B^- = B^..B + = B ^B^1 E I J F B C^@ = C^1 = F I J F B^@ = B^1 B^2 B^3 diff --git builtin/rev-parse.c builtin/rev-parse.c index 76cf05e..ad5e6ac 100644 --- builtin/rev-parse.c +++ builtin/rev-parse.c @@ -292,6 +292,32 @@ static int try_difference(const char *arg) return 0; } +static int try_parent_exclusion(const char *arg) +{ + int ret = 0; + char *to_rev = NULL; + char *from_rev = NULL; + unsigned char to_sha1[20]; + unsigned char from_sha1[20]; + + if (parse_parent_exclusion(arg, &to_rev, &from_rev)) + goto out; + if (get_sha1_committish(to_rev, to_sha1)) + goto out; + if (get_sha1_committish(from_rev, from_sha1)) + goto out; + + show_rev(NORMAL, to_sha1, to_rev); + show_rev(REVERSED, from_sha1, from_rev); + + ret = 1; + +out: + free(to_rev); + free(from_rev); + return ret; +} + static int try_parent_shorthands(const char *arg) { char *dotdot; @@ -839,6 +865,8 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix) /* Not a flag argument */ if (try_difference(arg)) continue; + if (try_parent_exclusion(arg)) + continue; if (try_parent_shorthands(arg)) continue; name = arg; diff --git revision.c revision.c index 969b3d1..0480f19 100644 --- revision.c +++ revision.c @@ -1419,6 +1419,93 @@ static void prepare_show_merge(struct rev_info *revs) revs->limited = 1; } +/* + * If 'arg' is on the form '^-{}', then return 0 and + * '*to_rev' and '*from_rev' will contain '' and '^', + * respectively. + */ +int parse_parent_exclusion(const char *arg, char **to_rev, char **from_rev) +{ + char *caret; + unsigned int n = 1; + + /* + * ^-{} is shorthand for ^.., with = 1 if + * not given. This is typically used for merge commits where you + * can just pass '^-' and it will show you all the commits in + * the branch that was merged. + */ + + if (!(caret = strstr(arg, "^-"))) + return 1; + if (caret[2]) { + char *end; + n = strtoul(&caret[2], &end, 10); + if (*end != '\0') + return 1; + } + *to_rev = xstrndup(arg, caret - arg); + *from_rev = xstrfmt("%s^%u", *to_rev, n); + return 0; +} + +static int handle_parent_exclusion(const char *arg, struct rev_info *revs, int flags) +{ + int ret = 1; + char *to_rev = NULL; + char *from_rev = NULL; + unsigned char to_sha1[20]; + unsigned char from_sha1[20]; + + struct object *a_obj, *b_obj; + unsigned int flags_exclude = flags ^ (UNINTERESTING | BOTTOM); + unsigned int a_flags; + + /* + * ^-{} is shorthand for ^.., with = 1 if + * not given. This is typically used for merge commits where you + * can just pass ^- and it will show you all the commits in + * the branches that were merged. + */ + + if (parse_parent_exclusion(arg, &to_rev, &from_rev)) + goto out; + + if (get_sha1_committish(to_rev, to_sha1)) { + if (revs->ignore_missing) + goto out; + die("Unknown revision %s", to_rev); + } + + if (get_sha1_committish(from_rev, from_sha1)) { + if (revs->ignore_missing) + goto out; + die("Unknown revision %s", from_rev); + } + + a_obj = parse_object(from_sha1); + b_obj = parse_object(to_sha1); + if (!a_obj || !b_obj) { + if (revs->ignore_missing) + goto out; + die("Invalid revision range %s", arg); + } + + a_flags = flags_exclude; + a_obj->flags |= a_flags; + b_obj->flags |= flags; + add_rev_cmdline(revs, a_obj, from_rev, REV_CMD_LEFT, a_flags); + add_pending_object(revs, a_obj, from_rev); + add_rev_cmdline(revs, b_obj, to_rev, REV_CMD_RIGHT, flags); + add_pending_object(revs, b_obj, to_rev); + + ret = 0; +out: + free(to_rev); + free(from_rev); + return ret; +} + int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsigned revarg_opt) { struct object_context oc; @@ -1519,6 +1606,10 @@ int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsi } *dotdot = '.'; } + + if (!handle_parent_exclusion(arg, revs, flags)) + return 0; + dotdot = strstr(arg, "^@"); if (dotdot && !dotdot[2]) { *dotdot = 0; diff --git revision.h revision.h index 9fac1a6..ca5bebc 100644 --- revision.h +++ revision.h @@ -243,6 +243,7 @@ extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, extern void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx, const struct option *options, const char * const usagestr[]); +extern int parse_parent_exclusion(const char *arg, char **to_rev, char **from_rev); #define REVARG_CANNOT_BE_FILENAME 01 #define REVARG_COMMITTISH 02 extern int handle_revision_arg(const char *arg, struct rev_info *revs, -- 2.10.0.rc0.1.g07c9292