log: add -L/--line-range option to follow file history by line range
We add an experimental -L/--line-range option to 'hg log' taking file patterns
along with a line range using the (new) FILE,FROMLINE-TOLINE syntax where FILE
may be a pattern (matching exactly one file). The resulting history is similar
to what the "followlines" revset except that, if --patch is specified,
only diff hunks within specified line range are shown.
Basically, this brings the CLI on par with what currently only exists in hgweb
through line selection in "file" and "annotate" views resulting in a file log
with filtered patch to only display followed line range.
The option may be specified multiple times and can be combined with --rev and
regular file patterns to further restrict revisions. Usage of this option
requires --follow; revisions are shown in descending order and renames are
followed. Only the --graph option is currently not supported.
The UI is the result of a consensus from review feedback at:
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-October/106749.html
The implementation spreads between commands.log() and cmdutil module.
In commands.log(), the main loop may now use a "hunksfilter" factory (similar
to "filematcher") that, for a given "rev", produces a filtering function
for diff hunks for a given file context object.
The logic to build revisions from -L/--line-range options lives in
cmdutil.getloglinerangerevs() which produces "revs", "filematcher" and
"hunksfilter" information. Revisions obtained by following files' line range
are filtered if they do not match the revset specified by --rev option. If
regular FILE arguments are passed along with -L options, both filematchers are
combined into a new matcher.
.. feature::
Add an experimental -L/--line-range FILE,FROMLINE-TOLINE option to 'hg log'
command to follow the history of files by line range. In combination with
-p/--patch option, only diff hunks within specified line range will be
displayed. Feedback, especially on UX aspects, is welcome.
$ cat >> $HGRCPATH << EOF
> [web]
> push_ssl = false
> allow_push = *
> EOF
$ hg init server
$ cd server
$ touch a
$ hg -q commit -A -m initial
$ cd ..
$ hg serve -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid >> $DAEMON_PIDS
compression formats are advertised in compression capability
#if zstd
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=zstd,zlib$' > /dev/null
#else
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=zlib$' > /dev/null
#endif
$ killdaemons.py
server.compressionengines can replace engines list wholesale
$ hg serve --config server.compressionengines=none -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=none$' > /dev/null
$ killdaemons.py
Order of engines can also change
$ hg serve --config server.compressionengines=none,zlib -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=none,zlib$' > /dev/null
$ killdaemons.py
Start a default server again
$ hg serve -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
Server should send application/mercurial-0.1 to clients if no Accept is used
$ get-with-headers.py --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: * (glob)
server: * (glob)
transfer-encoding: chunked
Server should send application/mercurial-0.1 when client says it wants it
$ get-with-headers.py --hgproto '0.1' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: * (glob)
server: * (glob)
transfer-encoding: chunked
Server should send application/mercurial-0.2 when client says it wants it
$ get-with-headers.py --hgproto '0.2' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.2
date: * (glob)
server: * (glob)
transfer-encoding: chunked
$ get-with-headers.py --hgproto '0.1 0.2' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.2
date: * (glob)
server: * (glob)
transfer-encoding: chunked
Requesting a compression format that server doesn't support results will fall back to 0.1
$ get-with-headers.py --hgproto '0.2 comp=aa' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: * (glob)
server: * (glob)
transfer-encoding: chunked
#if zstd
zstd is used if available
$ get-with-headers.py --hgproto '0.2 comp=zstd' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 36 --sha1 resp
resp: size=248, sha1=4d8d8f87fb82bd542ce52881fdc94f850748
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 7a 73 74 64 |t follows...zstd|
0020: 28 b5 2f fd |(./.|
#endif
application/mercurial-0.2 is not yet used on non-streaming responses
$ get-with-headers.py --hgproto '0.2' $LOCALIP:$HGPORT '?cmd=heads' -
200 Script output follows
content-length: 41
content-type: application/mercurial-0.1
date: * (glob)
server: * (glob)
e93700bd72895c5addab234c56d4024b487a362f
Now test protocol preference usage
$ killdaemons.py
$ hg serve --config server.compressionengines=none,zlib -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
No Accept will send 0.1+zlib, even though "none" is preferred b/c "none" isn't supported on 0.1
$ get-with-headers.py --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' Content-Type
200 Script output follows
content-type: application/mercurial-0.1
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 28 --sha1 resp
resp: size=227, sha1=35a4c074da74f32f5440da3cbf04
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 78 |t follows..x|
Explicit 0.1 will send zlib because "none" isn't supported on 0.1
$ get-with-headers.py --hgproto '0.1' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 28 --sha1 resp
resp: size=227, sha1=35a4c074da74f32f5440da3cbf04
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 78 |t follows..x|
0.2 with no compression will get "none" because that is server's preference
(spec says ZL and UN are implicitly supported)
$ get-with-headers.py --hgproto '0.2' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 32 --sha1 resp
resp: size=432, sha1=ac931b412ec185a02e0e5bcff98dac83
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 6e 6f 6e 65 |t follows...none|
Client receives server preference even if local order doesn't match
$ get-with-headers.py --hgproto '0.2 comp=zlib,none' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 32 --sha1 resp
resp: size=432, sha1=ac931b412ec185a02e0e5bcff98dac83
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 6e 6f 6e 65 |t follows...none|
Client receives only supported format even if not server preferred format
$ get-with-headers.py --hgproto '0.2 comp=zlib' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 33 --sha1 resp
resp: size=232, sha1=a1c727f0c9693ca15742a75c30419bc36
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 7a 6c 69 62 |t follows...zlib|
0020: 78 |x|