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.
#require no-windows no-rhg
XXX-RHG this test hangs if `hg` is really `rhg`. This was hidden by the use of
`alias hg=rhg` by run-tests.py. With such alias removed, this test is revealed
buggy. This need to be resolved sooner than later.
Dummy extension simulating unsafe long running command
$ SYNC_FILE="$TESTTMP/sync-file"
$ export SYNC_FILE
$ DONE_FILE="$TESTTMP/done-file"
$ export DONE_FILE
$
$ cat > wait_ext.py <<EOF
> import os
> import time
>
> from mercurial.i18n import _
> from mercurial import registrar
> from mercurial import testing
>
> cmdtable = {}
> command = registrar.command(cmdtable)
>
> @command(b'wait-signal', [], _(b'SYNC_FILE DONE_FILE'), norepo=True)
> def sleep(ui, sync_file=b"$SYNC_FILE", done_file=b"$DONE_FILE", **opts):
> start = time.time()
> with ui.uninterruptible():
> testing.write_file(sync_file, b'%d' % os.getpid())
> testing.wait_file(done_file)
> ui.warn(b"end of unsafe operation\n")
> ui.warn(b"%d second(s) passed\n" % int(time.time() - start))
> EOF
$ cat > send-signal.sh << EOF
> #!/bin/sh
> SIG=\$1
> if [ -z "\$SIG" ]; then
> echo "send-signal.sh requires one argument" >&2
> exit 1
> fi
> "$RUNTESTDIR/testlib/wait-on-file" 10 "$SYNC_FILE" || exit 2
> kill -s \$SIG \`cat "$SYNC_FILE"\`
> EOF
#if no-windows
$ chmod +x send-signal.sh
#endif
$ cat > wait-signal.sh << 'EOF'
> #!/bin/sh
> (hg wait-signal 2>&1; echo [$?]) | {
> read line
> touch "$DONE_FILE"
> echo "$line"
> cat
> }
> EOF
#if no-windows
$ chmod +x wait-signal.sh
#endif
Kludge to emulate timeout(1) which is not generally available.
Set up repository
$ hg init repo
$ cd repo
$ cat >> $HGRCPATH << EOF
> [extensions]
> wait_ext = $TESTTMP/wait_ext.py
> EOF
Test ctrl-c
$ rm -f $SYNC_FILE $DONE_FILE
$ sh -c "../send-signal.sh INT" &
$ ../wait-signal.sh
interrupted!
[255]
$ cat >> $HGRCPATH << EOF
> [experimental]
> nointerrupt = yes
> EOF
$ rm -f $SYNC_FILE $DONE_FILE
$ sh -c "../send-signal.sh INT" &
$ ../wait-signal.sh
interrupted!
[255]
$ cat >> $HGRCPATH << EOF
> [experimental]
> nointerrupt-interactiveonly = False
> EOF
$ rm -f $SYNC_FILE $DONE_FILE
$ sh -c "../send-signal.sh INT" &
$ ../wait-signal.sh
shutting down cleanly
press ^C again to terminate immediately (dangerous)
end of unsafe operation
interrupted!
[255]