Re: Git has two ways to count modified lines

From: Laurent Lyaudet <laurent.lyaudet@gmail.com>
Date: Apr 2, 2022, 16:49 UTC
Message-ID: <CAB1LBms3F1EGswxF9mO=JrmWmj4XFncv4ZrkAy-dvOHdVrkwLQ@mail.gmail.com>
In-Reply-To: <CAB1LBmvX4kv3yqSZ+X4Ozkb9esUem3U1JY48kWVi_Eef78Sk=Q@mail.gmail.com>

Le mer. 16 mars 2022 à 19:08, Laurent Lyaudet <laurent.lyaudet@gmail.com> a écrit :

Show 37 quoted lines

>
> Hello,
>
> I check the number of lines modified by my commits by hand,
> and today I had a surprising count :
>
> 1) I commit and get the following count
> laurent@laurent-GL73-8SD:~/ReposGit/flow$ git commit
> [master c068911] Task CU-21ph8h7 add buttons in PresenceList: "Tout
> déplier", "Tout replier", for this the useState for showDetail
> (boolean) in Presence is replaced by a useState for showDetails (Set
> of ids) in PresenceList; correction missing tr between thead and ths
> in PresenceList.
>  2 files changed, 88 insertions(+), 48 deletions(-)
>  rewrite src/apps/logs/components/PresenceList.js (61%)
>
> 2) I check the diff by hand, it doesn't match.
> I check on github, it agrees with my manual count.
>
> 3) I try to get the same answer again in command-line.
> laurent@laurent-GL73-8SD:~/ReposGit/flow$ git log -1 --shortstat
> commit c068911547bddbf7bfc4ddc7a68ee8482421ed5c (HEAD -> master,
> origin/master, origin/HEAD)
> Author: Laurent Lyaudet <laurent.lyaudet@gmail.com>
> Date:   Wed Mar 16 18:40:25 2022 +0100    Task CU-21ph8h7 add buttons
> in PresenceList: "Tout déplier", "Tout replier",
>     for this the useState for showDetail (boolean) in Presence is replaced
>     by a useState for showDetails (Set of ids) in PresenceList;
>     correction missing tr between thead and ths in PresenceList. 2
> files changed, 71 insertions(+), 31 deletions(-)
>
> How comes git has two ways to count modified lines ?
> How can I make git output again the same numbers than just after commit ?
> How can I check how it computed these numbers in the first place ?
>
> Thanks, best regards,
>     Laurent Lyaudet

Hello,

I thought my email was sent to the right mailbox, at least it is what says this website : https://git-scm.com/community

> General questions or comments for the Git community can be sent to the mailing list by using the email address git@vger.kernel.org.

Moreover this website is cited in the README here : https://github.com/git/git/blob/master/README.md

> Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

Is there any problem with my questions explaining I got no answer, please ?

I have found a partial explanation for the count differences :

>  2 files changed, 88 insertions(+), 48 deletions(-)
>  rewrite src/apps/logs/components/PresenceList.js (61%)

When committing, a file considered as "rewrite" is counted like m lines deleted and n lines added if it had m lines before and n lines after. Even if the diff is much smaller. Hence I answered my question :

> How can I check how it computed these numbers in the first place ?

But the two other questions remains :

> How comes git has two ways to count modified lines ?

i.e. What is (was) the purpose of this rewrite counting (when coded) ?

> How can I make git output again the same numbers than just after commit ?

Thanks, best regards,
    Laurent Lyaudet