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tests: use pyflakes as a tool, not a python module...

tests: use pyflakes as a tool, not a python module The usage of pyflakes as a Python module was introduced in e397c6d74652, to work around issue between Python 2 and Python 3. This issues are long behind us now and we can get beck to using pyflakes as a tool, giving us more flexibility about how we install it. The `hghave` requirements is modified to check that we have a tool available, instead of a python module.

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        Franck Bret
    
debug: add debug-revlog-stats command...

              r50714
            
      Force revlog max inline value to be smaller than default

        $ mkdir $TESTTMP/ext

        $ cat << EOF > $TESTTMP/ext/small_inline.py

        > from mercurial import revlog

        > revlog._maxinline = 8

        > EOF

        $ cat << EOF >> $HGRCPATH

        > [extensions]

        > small_inline=$TESTTMP/ext/small_inline.py

        > EOF

        $ hg init repo

        $ cd repo

      Try on an empty repository

        $ hg debug-revlog-stats

        rev-count   data-size inl type      target 

        $ mkdir folder

        $ touch a b folder/c folder/d

        $ hg commit -Aqm 0

        $ echo "text" > a

        $ hg rm b

        $ echo "longer string" > folder/d

        $ hg commit -Aqm 1

      Differences in data size observed with pure is due to different compression

      algorithms

        $ hg debug-revlog-stats

        rev-count   data-size inl type      target 

                2         138 no  changelog  (no-pure !)

                2         137 no  changelog  (pure !)

                2         177 no  manifest   (no-pure !)

                2         168 no  manifest   (pure !)

                2           6 yes file      a

                1           0 yes file      b

                1           0 yes file      folder/c

                2          15 no  file      folder/d

      Test 'changelog' command argument

        $ hg debug-revlog-stats -c

        rev-count   data-size inl type      target 

                2         138 no  changelog  (no-pure !)

                2         137 no  changelog  (pure !)

      Test 'manifest' command argument

        $ hg debug-revlog-stats -m

        rev-count   data-size inl type      target 

                2         177 no  manifest   (no-pure !)

                2         168 no  manifest   (pure !)

      Test 'file' command argument

        $ hg debug-revlog-stats -f

        rev-count   data-size inl type      target 

                2           6 yes file      a

                1           0 yes file      b

                1           0 yes file      folder/c

                2          15 no  file      folder/d

      Test multiple command arguments

        $ hg debug-revlog-stats -cm

        rev-count   data-size inl type      target 

                2         138 no  changelog  (no-pure !)

                2         137 no  changelog  (pure !)

                2         177 no  manifest   (no-pure !)

                2         168 no  manifest   (pure !)

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Franck Bret debug: add debug-revlog-stats command...	r50714	Force revlog max inline value to be smaller than default

		$ mkdir $TESTTMP/ext
		$ cat << EOF > $TESTTMP/ext/small_inline.py
		> from mercurial import revlog
		> revlog._maxinline = 8
		> EOF

		$ cat << EOF >> $HGRCPATH
		> [extensions]
		> small_inline=$TESTTMP/ext/small_inline.py
		> EOF

		$ hg init repo
		$ cd repo

		Try on an empty repository

		$ hg debug-revlog-stats
		rev-count data-size inl type target

		$ mkdir folder
		$ touch a b folder/c folder/d
		$ hg commit -Aqm 0
		$ echo "text" > a
		$ hg rm b
		$ echo "longer string" > folder/d
		$ hg commit -Aqm 1

		Differences in data size observed with pure is due to different compression
		algorithms

		$ hg debug-revlog-stats
		rev-count data-size inl type target
		2 138 no changelog (no-pure !)
		2 137 no changelog (pure !)
		2 177 no manifest (no-pure !)
		2 168 no manifest (pure !)
		2 6 yes file a
		1 0 yes file b
		1 0 yes file folder/c
		2 15 no file folder/d

		Test 'changelog' command argument

		$ hg debug-revlog-stats -c
		rev-count data-size inl type target
		2 138 no changelog (no-pure !)
		2 137 no changelog (pure !)

		Test 'manifest' command argument

		$ hg debug-revlog-stats -m
		rev-count data-size inl type target
		2 177 no manifest (no-pure !)
		2 168 no manifest (pure !)

		Test 'file' command argument

		$ hg debug-revlog-stats -f
		rev-count data-size inl type target
		2 6 yes file a
		1 0 yes file b
		1 0 yes file folder/c
		2 15 no file folder/d

		Test multiple command arguments

		$ hg debug-revlog-stats -cm
		rev-count data-size inl type target
		2 138 no changelog (no-pure !)
		2 137 no changelog (pure !)
		2 177 no manifest (no-pure !)
		2 168 no manifest (pure !)