d24bba8008
This makes pickaxe more intelligent than the classic blame.
A typical example is a change that moves one static C function
from lower part of the file to upper part of the same file,
because you added a new caller in the middle.
The versions in the parent and the child would look like this:
parent child
A static foo() {
B ...
C }
D A
E B
F C
G D
static foo() { ... call foo();
... E
} F
H G
H
With the classic blame algorithm, we can blame lines A B C D E F
G and H to the parent. The child is guilty of introducing the
line "... call foo();", and the blame is placed on the child.
However, the classic blame algorithm fails to notice that the
implementation of foo() at the top of the file is not new, and
moved from the lower part of the parent.
This commit introduces detection of such line movements, and
correctly blames the lines that were simply moved in the file to
the parent.
Signed-off-by: Junio C Hamano <junkio@cox.net>
117 lines
3.6 KiB
Plaintext
117 lines
3.6 KiB
Plaintext
git-pickaxe(1)
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==============
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NAME
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----
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git-pickaxe - Show what revision and author last modified each line of a file
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SYNOPSIS
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--------
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[verse]
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'git-pickaxe' [-c] [-l] [-t] [-f] [-n] [-p] [-L n,m] [-S <revs-file>]
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[-M] [--since=<date>] [<rev>] [--] <file>
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DESCRIPTION
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-----------
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Annotates each line in the given file with information from the revision which
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last modified the line. Optionally, start annotating from the given revision.
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Also it can limit the range of lines annotated.
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This report doesn't tell you anything about lines which have been deleted or
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replaced; you need to use a tool such as gitlink:git-diff[1] or the "pickaxe"
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interface briefly mentioned in the following paragraph.
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Apart from supporting file annotation, git also supports searching the
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development history for when a code snippet occured in a change. This makes it
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possible to track when a code snippet was added to a file, moved or copied
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between files, and eventually deleted or replaced. It works by searching for
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a text string in the diff. A small example:
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-----------------------------------------------------------------------------
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$ git log --pretty=oneline -S'blame_usage'
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5040f17eba15504bad66b14a645bddd9b015ebb7 blame -S <ancestry-file>
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ea4c7f9bf69e781dd0cd88d2bccb2bf5cc15c9a7 git-blame: Make the output
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-----------------------------------------------------------------------------
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OPTIONS
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-------
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-c, --compatibility::
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Use the same output mode as gitlink:git-annotate[1] (Default: off).
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-L n,m::
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Annotate only the specified line range (lines count from 1).
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-l, --long::
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Show long rev (Default: off).
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-t, --time::
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Show raw timestamp (Default: off).
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-S, --rev-file <revs-file>::
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Use revs from revs-file instead of calling gitlink:git-rev-list[1].
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-f, --show-name::
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Show filename in the original commit. By default
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filename is shown if there is any line that came from a
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file with different name, due to rename detection.
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-n, --show-number::
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Show line number in the original commit (Default: off).
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-p, --porcelain::
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Show in a format designed for machine consumption.
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-M::
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Detect moving lines in the file as well. When a commit
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moves a block of lines in a file (e.g. the original file
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has A and then B, and the commit changes it to B and
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then A), traditional 'blame' algorithm typically blames
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the lines that were moved up (i.e. B) to the parent and
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assigns blame to the lines that were moved down (i.e. A)
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to the child commit. With this option, both groups of
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lines are blamed on the parent.
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-h, --help::
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Show help message.
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THE PORCELAIN FORMAT
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--------------------
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In this format, each line is output after a header; the
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header at the minumum has the first line which has:
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- 40-byte SHA-1 of the commit the line is attributed to;
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- the line number of the line in the original file;
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- the line number of the line in the final file;
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- on a line that starts a group of line from a different
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commit than the previous one, the number of lines in this
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group. On subsequent lines this field is absent.
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This header line is followed by the following information
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at least once for each commit:
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- author name ("author"), email ("author-mail"), time
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("author-time"), and timezone ("author-tz"); similarly
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for committer.
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- filename in the commit the line is attributed to.
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- the first line of the commit log message ("summary").
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The contents of the actual line is output after the above
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header, prefixed by a TAB. This is to allow adding more
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header elements later.
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SEE ALSO
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--------
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gitlink:git-blame[1]
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AUTHOR
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------
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Written by Junio C Hamano <junkio@cox.net>
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GIT
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---
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Part of the gitlink:git[7] suite
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