NAME
----
-gitdiffcore - Tweaking diff output (June 2005)
+gitdiffcore - Tweaking diff output
SYNOPSIS
--------
+[verse]
'git diff' *
DESCRIPTION
-----------
-The diff commands 'git-diff-index', 'git-diff-files', and 'git-diff-tree'
+The diff commands 'git diff-index', 'git diff-files', and 'git diff-tree'
can be told to manipulate differences they find in
unconventional ways before showing 'diff' output. The manipulation
is collectively called "diffcore transformation". This short note
The chain of operation
----------------------
-The 'git-diff-{asterisk}' family works by first comparing two sets of
+The 'git diff-{asterisk}' family works by first comparing two sets of
files:
- - 'git-diff-index' compares contents of a "tree" object and the
+ - 'git diff-index' compares contents of a "tree" object and the
working directory (when '\--cached' flag is not used) or a
"tree" object and the index file (when '\--cached' flag is
used);
- - 'git-diff-files' compares contents of the index file and the
+ - 'git diff-files' compares contents of the index file and the
working directory;
- - 'git-diff-tree' compares contents of two "tree" objects;
+ - 'git diff-tree' compares contents of two "tree" objects;
In all of these cases, the commands themselves first optionally limit
the two sets of files by any pathspecs given on their command-lines,
- diffcore-pickaxe
- diffcore-order
-These are applied in sequence. The set of filepairs 'git-diff-{asterisk}'
+These are applied in sequence. The set of filepairs 'git diff-{asterisk}'
commands find are used as the input to diffcore-break, and
the output from diffcore-break is used as the input to the
next transformation. The final result is then passed to the
output routine and generates either diff-raw format (see Output
-format sections of the manual for 'git-diff-{asterisk}' commands) or
+format sections of the manual for 'git diff-{asterisk}' commands) or
diff-patch format.
----------------------------------------------------
The second transformation in the chain is diffcore-break, and is
-controlled by the -B option to the 'git-diff-{asterisk}' commands. This is
+controlled by the -B option to the 'git diff-{asterisk}' commands. This is
used to detect a filepair that represents "complete rewrite" and
break such filepair into two filepairs that represent delete and
create. E.g. If the input contained this filepair:
For the purpose of breaking a filepair, diffcore-break examines
the extent of changes between the contents of the files before
and after modification (i.e. the contents that have "bcd1234..."
-and "0123456..." as their SHA1 content ID, in the above
+and "0123456..." as their SHA-1 content ID, in the above
example). The amount of deletion of original contents and
insertion of new material are added together, and if it exceeds
the "break score", the filepair is broken into two. The break
This transformation is used to detect renames and copies, and is
controlled by the -M option (to detect renames) and the -C option
-(to detect copies as well) to the 'git-diff-{asterisk}' commands. If the
+(to detect copies as well) to the 'git diff-{asterisk}' commands. If the
input contained these filepairs:
------------------------------------------------
number after the "-M" or "-C" option (e.g. "-M8" to tell it to use
8/10 = 80%).
-Note. When the "-C" option is used with `\--find-copies-harder`
-option, 'git-diff-{asterisk}' commands feed unmodified filepairs to
+Note. When the "-C" option is used with `--find-copies-harder`
+option, 'git diff-{asterisk}' commands feed unmodified filepairs to
diffcore mechanism as well as modified ones. This lets the copy
detector consider unmodified files as copy source candidates at
-the expense of making it slower. Without `\--find-copies-harder`,
-'git-diff-{asterisk}' commands can detect copies only if the file that was
+the expense of making it slower. Without `--find-copies-harder`,
+'git diff-{asterisk}' commands can detect copies only if the file that was
copied happened to have been modified in the same changeset.
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-{asterisk}'
+-S option and the `--pickaxe-all` option to the 'git diff-*'
commands.
When diffcore-pickaxe is in use, it checks if there are
-filepairs whose "original" side has the specified string and
-whose "result" side does not. Such a filepair represents "the
-string appeared in this changeset". It also checks for the
+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.
-When `\--pickaxe-all` is not in effect, diffcore-pickaxe leaves
+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
+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
This is used to reorder the filepairs according to the user's
(or project's) taste, and is controlled by the -O option to the
-'git-diff-{asterisk}' commands.
+'git diff-{asterisk}' commands.
This takes a text file each of whose lines is a shell glob
pattern. Filepairs that match a glob pattern on an earlier line
in the file are output before ones that match a later line, and
filepairs that do not match any glob pattern are output last.
-As an example, a typical orderfile for the core git probably
+As an example, a typical orderfile for the core Git probably
would look like this:
------------------------------------------------