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diffcore-pickaxe doc: document -S and -G properly

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The documentation of -S and -G is very sketchy.  Completely rewrite the
sections in Documentation/diff-options.txt and
Documentation/gitdiffcore.txt.

References:
52e9578 ([PATCH] Introducing software archaeologist's tool "pickaxe".)
f506b8e (git log/diff: add -G<regexp> that greps in the patch text)

Inputs-from: Phil Hord <phil.hord@gmail.com>
Co-authored-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ramkumar Ramachandra
2013-05-31 17:42:15 +05:30
committed by Junio C Hamano
parent 276b22d333
commit 5bc3f0b567
2 changed files with 55 additions and 24 deletions
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41
Documentation/gitdiffcore.txt
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@ -222,26 +222,35 @@ version prefixed with '+'.
diffcore-pickaxe: For Detecting Addition/Deletion of Specified String
---------------------------------------------------------------------
This transformation is used to find filepairs that represent
changes that touch a specified string, and is controlled by the
-S option and the `--pickaxe-all` option to the 'git diff-*'
commands.
This transformation limits the set of filepairs to those that change
specified strings between the preimage and the postimage in a certain
way. -S<block of text> and -G<regular expression> options are used to
specify different ways these strings are sought.
When diffcore-pickaxe is in use, it checks if there are
filepairs whose "result" side and whose "origin" side have
different number of specified string. Such a filepair represents
"the string appeared in this changeset". It also checks for the
opposite case that loses the specified string.
"-S<block of text>" detects filepairs whose preimage and postimage
have different number of occurrences of the specified block of text.
By definition, it will not detect in-file moves. Also, when a
changeset moves a file wholesale without affecting the interesting
string, diffcore-rename kicks in as usual, and `-S` omits the filepair
(since the number of occurrences of that string didn't change in that
rename-detected filepair). When used with `--pickaxe-regex`, treat
the <block of text> as an extended POSIX regular expression to match,
instead of a literal string.
When `--pickaxe-all` is not in effect, diffcore-pickaxe leaves
only such filepairs that touch the specified string in its
output. When `--pickaxe-all` is used, diffcore-pickaxe leaves all
filepairs intact if there is such a filepair, or makes the
output empty otherwise. The latter behaviour is designed to
make reviewing of the changes in the context of the whole
"-G<regular expression>" (mnemonic: grep) detects filepairs whose
textual diff has an added or a deleted line that matches the given
regular expression. This means that it will detect in-file (or what
rename-detection considers the same file) moves, which is noise. The
implementation runs diff twice and greps, and this can be quite
expensive.
When `-S` or `-G` are used without `--pickaxe-all`, only filepairs
that match their respective criterion are kept in the output. When
`--pickaxe-all` is used, if even one filepair matches their respective
criterion in a changeset, the entire changeset is kept. This behavior
is designed to make reviewing changes in the context of the whole
changeset easier.
diffcore-order: For Sorting the Output Based on Filenames
---------------------------------------------------------