tests: omit -p for external diff via extdiff extension for portability Before this patch, some tests using external "diff" command via extdiff extension fail on Solaris, because "-p" (show which C function each change is in) option isn't supported by system standard "diff" on Solaris, even though extdiff passes it to external "diff" by default. Fortunately, this non-portable option isn't important for (current, at least) tests using external "diff" command via extdiff extension. This patch omits "-p" for external "diff" command via extdiff extension for portability of tests, and adds check-code.py a rule to detect invocation of "diff" with "-p". Newly added check-code.py rule examines only lines generated by external "diff" with "-r", because strict examination might misidentify "hg diff -p" or other complicated lines consisting of "diff" string as wrong one. This patch is a part of making tests using external "diff" portable, and tests below aren't yet portable even after this patch. test-graft.t test-largefiles-update.t test-subrepo-deep-nested-change.t

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https://bz.mercurial-scm.org/842

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  $ hg init

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  $ echo foo > a

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  $ hg ci -Ama

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  adding a

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  $ hg up -r0000

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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  $ echo bar > a

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Should issue new head warning:

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  $ hg ci -Amb

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  adding a

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  created new head

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  $ hg up -r0000

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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  $ echo stuffy > a

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Should not issue new head warning:

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  $ hg ci -q -Amc

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  $ hg up -r0000

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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  $ echo crap > a

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  $ hg branch testing

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  marked working directory as branch testing

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  (branches are permanent and global, did you want a bookmark?)

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Should not issue warning:

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  $ hg ci -q -Amd

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