templatekw: compare target context and its parent exactly (issue4690) Before this patch, template keywords `{file_mods}`, `{file_adds}` and `{file_dels}` use values gotten by `repo.status(ctx.p1().node(), ctx.node())`. But this doesn't work as expected if `ctx` is `memctx` or `workingcommitctx`. Typical case of templating with these contexts is customization of the text shown in the commit message editor by `[committemplate]` configuration. In this case, `ctx.node()` returns None and it causes comparison between `ctx.p1()` and `workingctx`. `workingctx` lists up all changed files in the working directory even at selective committing. BTW, `{files}` uses `ctx.files()` and it works as expected. To compare target context and its parent exactly, this patch passes `ctx.p1()` and `ctx` without `node()`-nize. This avoids unexpected comparison with `workingctx`. This patch uses a little redundant template configurations in `test-commit.t`, but they are needed to avoid regression around problems fixed by a4958cdb2202 and 1e6fb8db666e: accessing on `ctx` may break `ctx._status` field.

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Test encode/decode filters

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  $ hg init

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  $ cat > .hg/hgrc <<EOF

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  > [encode]

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  > not.gz = tr [:lower:] [:upper:]

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  > *.gz = gzip -d

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  > [decode]

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  > not.gz = tr [:upper:] [:lower:]

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  > *.gz = gzip

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  > EOF

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  $ echo "this is a test" | gzip > a.gz

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  $ echo "this is a test" > not.gz

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  $ hg add *

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  $ hg ci -m "test"

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no changes

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  $ hg status

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  $ touch *

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no changes

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  $ hg status

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check contents in repo are encoded

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  $ hg debugdata a.gz 0

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  this is a test

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  $ hg debugdata not.gz 0

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  THIS IS A TEST

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check committed content was decoded

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  $ gunzip < a.gz

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  this is a test

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  $ cat not.gz

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  this is a test

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  $ rm *

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  $ hg co -C

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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

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check decoding of our new working dir copy

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  $ gunzip < a.gz

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  this is a test

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  $ cat not.gz

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  this is a test

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check hg cat operation

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  $ hg cat a.gz

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  this is a test

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  $ hg cat --decode a.gz | gunzip

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  this is a test

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  $ mkdir subdir

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  $ cd subdir

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  $ hg -R .. cat ../a.gz

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  this is a test

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  $ hg -R .. cat --decode ../a.gz | gunzip

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  this is a test

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  $ cd ..