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$ cat > engine.py << EOF
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>
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> from mercurial import (
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> pycompat,
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> templater,
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> templateutil,
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> )
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>
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> class mytemplater(templater.engine):
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> def _load(self, t):
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> return self._loader(t)
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>
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> def process(self, t, map):
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> tmpl = self._load(t)
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> props = self._defaults.copy()
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> props.update(map)
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> for k, v in props.items():
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> if k in (b'templ', b'ctx', b'repo', b'revcache', b'cache',
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> b'troubles'):
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> continue
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> if callable(v) and getattr(v, '_requires', None) is None:
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> props = self._resources.copy()
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> props.update(map)
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> v = v(**pycompat.strkwargs(props))
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> elif callable(v):
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> v = v(self, props)
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> v = templateutil.stringify(v)
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> tmpl = tmpl.replace(b'{{%s}}' % k, v)
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> yield tmpl
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>
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> templater.engines[b'my'] = mytemplater
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> EOF
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$ hg init test
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$ echo '[extensions]' > test/.hg/hgrc
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$ echo "engine = `pwd`/engine.py" >> test/.hg/hgrc
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$ cd test
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$ cat > mymap << EOF
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> changeset = my:changeset.txt
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> EOF
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$ cat > changeset.txt << EOF
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> {{rev}} {{node}} {{author}}
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> EOF
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$ hg ci -Ama
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adding changeset.txt
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adding mymap
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$ hg log --style=./mymap
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0 97e5f848f0936960273bbf75be6388cd0350a32b test
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$ cat > changeset.txt << EOF
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> {{p1rev}} {{p1node}} {{p2rev}} {{p2node}}
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> EOF
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$ hg ci -Ama
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$ hg log --style=./mymap
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0 97e5f848f0936960273bbf75be6388cd0350a32b -1 0000000000000000000000000000000000000000
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|
-1 0000000000000000000000000000000000000000 -1 0000000000000000000000000000000000000000
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|
invalid engine type:
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$ echo 'changeset = unknown:changeset.txt' > unknownenginemap
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$ hg log --style=./unknownenginemap
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abort: invalid template engine: unknown
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[255]
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$ cd ..
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