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[192.252.130.194]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA) by 0.0.0.0:465 (trex/5.5.4); Thu, 21 Jul 2016 17:20:24 -0400 Subject: Re: [PATCH v4 4/8] doc: give headings for the two and three dot notations To: Philip Oakley , GitList References: <20160711202518.532-1-philipoakley@iee.org> <20160720211007.5520-1-philipoakley@iee.org> <20160720211007.5520-5-philipoakley@iee.org> <5790DF64.8030603@xiplink.com> <9B0B8E2D61D34BFEB8FC3F30EB23437C@PhilipOakley> Cc: Junio C Hamano , Jeff King , Jakub Narebski From: Marc Branchaud Message-ID: <57913C97.1030001@xiplink.com> Date: Thu, 21 Jul 2016 17:20:23 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <9B0B8E2D61D34BFEB8FC3F30EB23437C@PhilipOakley> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org On 2016-07-21 03:54 PM, Philip Oakley wrote: > From: "Marc Branchaud" >> On 2016-07-20 05:10 PM, Philip Oakley wrote: >>> While there, also break out the other shorthand notations and >>> add a title for the revision range summary (which also appears >>> in git-rev-parse, so keep it mixed case). >>> >>> Signed-off-by: Philip Oakley >>> --- >>> Documentation/revisions.txt | 58 >>> ++++++++++++++++++++++++++++----------------- >>> 1 file changed, 36 insertions(+), 22 deletions(-) >>> >>> diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt >>> index 6e9cd41..5b37283 100644 >>> --- a/Documentation/revisions.txt >>> +++ b/Documentation/revisions.txt >>> @@ -242,35 +242,49 @@ specifying a single revision with the notation >>> described in the >>> previous section means the set of commits reachable from that >>> commit, following the commit ancestry chain. >>> >>> -To exclude commits reachable from a commit, a prefix '{caret}' >>> -notation is used. E.g. '{caret}r1 r2' means commits reachable >>> -from 'r2' but exclude the ones reachable from 'r1'. >>> - >>> -This set operation appears so often that there is a shorthand >>> -for it. When you have two commits 'r1' and 'r2' (named according >>> -to the syntax explained in SPECIFYING REVISIONS above), you can ask >>> -for commits that are reachable from r2 excluding those that are >>> reachable >>> -from r1 by '{caret}r1 r2' and it can be written as 'r1..r2'. >>> - >>> -A similar notation 'r1\...r2' is called symmetric difference >>> -of 'r1' and 'r2' and is defined as >>> -'r1 r2 --not $(git merge-base --all r1 r2)'. >>> -It is the set of commits that are reachable from either one of >>> -'r1' (left side) or 'r2' (right side) but not from both. >>> - >>> -In these two shorthands, you can omit one end and let it default to >>> HEAD. >>> +Commit Exclusions >>> +~~~~~~~~~~~~~~~~~ >>> + >>> +'{caret}' (caret) Notation:: >>> + To exclude commits reachable from a commit, a prefix '{caret}' >>> + notation is used. E.g. '{caret}r1 r2' means commits reachable >>> + from 'r2' but exclude the ones reachable from 'r1'. >>> + >>> +Dotted Range Notations >>> +~~~~~~~~~~~~~~~~~~~~~~ >>> + >>> +The '..' (two-dot) Range Notation:: >>> + The '{caret}r1 r2' set operation appears so often that there is a >>> shorthand >>> + for it. When you have two commits 'r1' and 'r2' (named according >>> + to the syntax explained in SPECIFYING REVISIONS above), you can ask >>> + for commits that are reachable from r2 excluding those that are >>> reachable >>> + from r1 by '{caret}r1 r2' and it can be written as 'r1..r2'. >>> + >>> +The '...' (three dot) Symmetric Difference Notation:: >>> + A similar notation 'r1\...r2' is called symmetric difference >> >> s/called/called the/ > > The wording is the original ;-) Can change. > >> >>> + of 'r1' and 'r2' and is defined as >>> + 'r1 r2 --not $(git merge-base --all r1 r2)'. >>> + It is the set of commits that are reachable from either one of >>> + 'r1' (left side) or 'r2' (right side) but not from both. >>> + >>> +In these two shorthand notations, you can omit one end and let it >>> default to HEAD. >>> For example, 'origin..' is a shorthand for 'origin..HEAD' and asks >>> "What >>> did I do since I forked from the origin branch?" Similarly, >>> '..origin' >>> 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. >>> >>> -Two other shorthands for naming a set that is formed by a commit >>> -and its parent commits exist. The 'r1{caret}@' notation means all >>> -parents of 'r1'. 'r1{caret}!' includes commit 'r1' but excludes >>> -all of its parents. >>> +Special '{caret}' Shorthand Notations >>> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> >> Sorry, but this header also does not render properly in the man page. >> Maybe just "Special {caret} Shorthand Notations"? (But read on!) > > rendered fine on the MYS2 man invocation - I had had to add the > prefix to the quoted title to make it work. > > What went wrong for you? (I'll read on) Only the word "Special" is emphasized (in bold). The rest of the header is plain. I'm using asciidoc 8.6.9, so I'm likely suffering from the bug Peff identified. >> >>> +Two other shorthands exist, particularly useful for merge commits, is >>> +for naming a set that is formed by a commit and its parent commits. >>> >>> -To summarize: >>> +The 'r1{caret}@' notation means all parents of 'r1'. >>> + >>> +'r1{caret}!' includes commit 'r1' but excludes all of its parents. >> >> My immediate thought upon reading this is "Why not just use 'r1'?" I >> think the answer is "This truncates the range." So, for example, "git >> log r1" shows you r1 and its ancestors, while "git log r1^!" only >> shows you r1. I think you should add this example, or something similar. >> > > I'd also asked that question in one of my replies earlier $gmane/299849. > I was then able to determine that it was a width wide 'range' covering > multi-parent situations. Obviously, I see it more an anti-range. You're never going to get more than a single commit with this notation. > Identifying an example could be good if it was succinct and explanatory. What do you think of my example? > $ git rev-parse 6c71a849^! >> But, really, this means that the notation is another "Commit >> Exclusion" and properly belongs in that section. > > I think it's bigger than that. >> >> That makes this "Special Notations" section rather thin. I suggest >> moving a slightly expanded ^@ description to a small subsection >> just before Commit Exclusions, and deleting the Special Notations >> section altogether. So add something like this: >> >> Commit Parents >> ~~~~~~~~~~~~~~ > > It's a bit better, but I'm still not sure it really tells the story, > maybe "Handling Commit Parent(s)", with that subtle extra emphasis! "Specifying Commit Parents"? Any of these work for me, really. >> >> '{caret}@' Notation:: >> The 'r1{caret}@' notation means all parents of 'r1', >> excluding 'r1' itself. >> >> This smoothly re-introduces the notion of parents for readers who >> skipped to this section, and helps them make sense of the ^! >> notation. >> >> Plus there's no longer anything "special" about any of the syntax. >> >>> + >>> +Revision Range Summary >>> +---------------------- >> >> Sorry, but the man page renders this in all caps. I really think you >> should use ~~~~~~~~~ here. > > Yes, the man page formating is annoying relative to the web page > formatting which it has to be compared against. > > I felt that it was at a higher level than the other sub-headings, and > that using mixed case did work well on the html (the Git for Windows > standard). IMHO it has to look like it's part of the SPECIFYING RANGES section. It need not be higher than the other subsections though. > At the moment I'm minded to keep it as is unless others chime in. I'll bow to the will of the majority. >> >> M. >> > I'll be away till mid next week. As will I! M.