A python hook for "hg fix" that prints out the number of files and revisions

that were affected, along with which fixer tools were applied. Also checks how

many times it sees a specific key generated by one of the fixer tools defined

below.

  $ cat >> $TESTTMP/postfixhook.py <<EOF

  > import collections

  > def file(ui, repo, rev=None, path='', metadata=None, **kwargs):

  >   ui.status('fixed %s in revision %d using %s\n' %

  >             (path, rev, ', '.join(metadata.keys())))

  > def summarize(ui, repo, replacements=None, wdirwritten=False,

  >               metadata=None, **kwargs):

  >     counts = collections.defaultdict(int)

  >     keys = 0

  >     for fixername, metadatalist in metadata.items():

  >         for metadata in metadatalist:

  >             if metadata is None:

  >                 continue

  >             counts[fixername] += 1

  >             if 'key' in metadata:

  >                 keys += 1

  >     ui.status('saw "key" %d times\n' % (keys,))

  >     for name, count in sorted(counts.items()):

  >         ui.status('fixed %d files with %s\n' % (count, name))

  >     if replacements:

  >         ui.status('fixed %d revisions\n' % (len(replacements),))

  >     if wdirwritten:

  >         ui.status('fixed the working copy\n')

  > EOF

Some mock output for fixer tools that demonstrate what could go wrong with

expecting the metadata output format.

  $ printf 'new content\n' > $TESTTMP/missing

  $ printf 'not valid json\0new content\n' > $TESTTMP/invalid

  $ printf '{"key": "value"}\0new content\n' > $TESTTMP/valid

Configure some fixer tools based on the output defined above, and enable the

hooks defined above. Disable parallelism to make output of the parallel file

processing phase stable.

  $ cat >> $HGRCPATH <<EOF

  > [extensions]

  > fix =

  > [fix]

  > missing:command=cat $TESTTMP/missing

  > missing:pattern=missing

  > missing:metadata=true

  > invalid:command=cat $TESTTMP/invalid

  > invalid:pattern=invalid

  > invalid:metadata=true

  > valid:command=cat $TESTTMP/valid

  > valid:pattern=valid

  > valid:metadata=true

  > [hooks]

  > postfixfile = python:$TESTTMP/postfixhook.py:file

  > postfix = python:$TESTTMP/postfixhook.py:summarize

  > [worker]

  > enabled=false

  > EOF

See what happens when we execute each of the fixer tools. Some print warnings,

some write back to the file.

  $ hg init repo

  $ cd repo

  $ printf "old content\n" > invalid

  $ printf "old content\n" > missing

  $ printf "old content\n" > valid

  $ hg add -q

  $ hg fix -w

  ignored invalid output from fixer tool: invalid

  ignored invalid output from fixer tool: missing

  fixed valid in revision 2147483647 using valid

  saw "key" 1 times

  fixed 1 files with valid

  fixed the working copy

  $ cat missing invalid valid

  old content

  old content

  new content

  $ cd ..