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bug#61396: diff mode could distinguish changed from deleted lines
From: |
Samuel Wales |
Subject: |
bug#61396: diff mode could distinguish changed from deleted lines |
Date: |
Sun, 12 Feb 2023 15:48:04 -0700 |
for purposes of showing what i mean, suppose you have approximately like:
--- ...
+++ ...
@@ ... @@
-1 hmm
-2 hi
-3
+1 really?
+2 there
+3 for all good men
[btw this is all merely an arbitrary quote from history from a diff tutorial.]
now what does diff-mode do with this? it usually does a pretty good
job. sometimes there are glitches.
diff-mode leaves 1 2 3 characters alone. it uses diff-removed and
diff-added for them.
--- ...
+++ ...
@@ -104,3 +104,3 @@
-1 HMM
-2 HI
-3
+1 REALLY?
+2 THERE
+3 FOR ALL GOOD MEN
this output is correct. hmm and really are different and hi and there
are different.
line 3 is special. the - and + moieties are different. but they are
different specially. that is because in - there is an /absence/ of
for all good men. diff-mode does not show absence. there is no
marker saying "soiemthing is absent".
in - for line 3 it is also special for the user interpretation. it
could indicate that the line is entirely unique to A according to
diff-mode. OR it could indicate that it is in both A and B but
different in B like 1 and 2.
this is ambiguous. an indicator reovs ambiguity. the idea is merely
one thing: indicating absence.
the same idea is true of a hypothetical opposite case where 3 in +,
not -, lacks an indicator.
can it be done? naturally, all of this is heuristic-ish to begin
with, insofar as human interpretation is concerned. that's why we
have difftastic and histogram and all that stuff. the solution --
indicators for absence -- will also be. that is ok.
adjacency and blocks are not likely to be the solution. if it is
elaborate or special-cased, then it is likely impractical.
On 2/12/23, Samuel Wales <samologist@gmail.com> wrote:
> below.
>
> On 2/12/23, Juri Linkov <juri@linkov.net> wrote:
>> But it seems that you want to check words on every line in the block
>> for changes, and to categorize every line to three groups:
>
> i do not want what you described.
>
--
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- bug#61396: diff mode could distinguish changed from deleted lines, (continued)
- bug#61396: diff mode could distinguish changed from deleted lines, Dmitry Gutov, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Samuel Wales, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Dmitry Gutov, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Samuel Wales, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Dmitry Gutov, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Samuel Wales, 2023/02/11
- bug#61396: diff mode could distinguish changed from deleted lines, Juri Linkov, 2023/02/12
- bug#61396: diff mode could distinguish changed from deleted lines, Samuel Wales, 2023/02/12
- bug#61396: diff mode could distinguish changed from deleted lines, Juri Linkov, 2023/02/12
- bug#61396: diff mode could distinguish changed from deleted lines, Samuel Wales, 2023/02/12
- bug#61396: diff mode could distinguish changed from deleted lines,
Samuel Wales <=