templates: add filter to reverse list
The filter supports only lists because for lists, it’s straightforward to
implement. Reversing text doesn’t seem very useful and is hard to implement.
Reversing the bytes would break multi-bytes encodings. Reversing the code
points would break characters consisting of multiple code points. Reversing
graphemes is non-trivial without using a library not included in the standard
library.
$ NO_FALLBACK="env RHG_ON_UNSUPPORTED=abort"
$ cat << EOF >> $HGRCPATH
> [format]
> sparse-revlog = no
> EOF
$ hg init repo --config format.generaldelta=no --config format.usegeneraldelta=no
$ cd repo
$ (echo header; seq.py 20) > f
$ hg commit -q -Am initial
$ (echo header; seq.py 20; echo footer) > f
$ hg commit -q -Am x
$ hg update ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ (seq.py 20; echo footer) > f
$ hg commit -q -Am y
$ hg debugdeltachain f --template '{rev} {prevrev} {deltatype}\n'
0 -1 base
1 0 prev
2 1 prev
rhg works on non-generaldelta revlogs:
$ $NO_FALLBACK hg cat f -r .
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
footer