git/Documentation/blame-options.txt
Barret Rhoden 8934ac8c92 blame: add config options for the output of ignored or unblamable lines
When ignoring commits, the commit that is blamed might not be
responsible for the change, due to the inaccuracy of our heuristic.
Users might want to know when a particular line has a potentially
inaccurate blame.

Furthermore, guess_line_blames() may fail to find any parent commit for
a given line touched by an ignored commit.  Those 'unblamable' lines
remain blamed on an ignored commit.  Users might want to know if a line
is unblamable so that they do not spend time investigating a commit they
know is uninteresting.

This patch adds two config options to mark these two types of lines in
the output of blame.

The first option can identify ignored lines by specifying
blame.markIgnoredLines.  When this option is set, each blame line that
was blamed on a commit other than the ignored commit is marked with a
'?'.

For example:
	278b6158d6fdb (Barret Rhoden  2016-04-11 13:57:54 -0400 26)
appears as:
	?278b6158d6fd (Barret Rhoden  2016-04-11 13:57:54 -0400 26)

where the '?' is placed before the commit, and the hash has one fewer
characters.

Sometimes we are unable to even guess at what ancestor commit touched a
line.  These lines are 'unblamable.'  The second option,
blame.markUnblamableLines, will mark the line with '*'.

For example, say we ignore e5e8d36d04cbe, yet we are unable to blame
this line on another commit:
	e5e8d36d04cbe (Barret Rhoden  2016-04-11 13:57:54 -0400 26)
appears as:
	*e5e8d36d04cb (Barret Rhoden  2016-04-11 13:57:54 -0400 26)

When these config options are used together, every line touched by an
ignored commit will be marked with either a '?' or a '*'.

Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-16 11:36:23 +09:00

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-b::
Show blank SHA-1 for boundary commits. This can also
be controlled via the `blame.blankboundary` config option.
--root::
Do not treat root commits as boundaries. This can also be
controlled via the `blame.showRoot` config option.
--show-stats::
Include additional statistics at the end of blame output.
-L <start>,<end>::
-L :<funcname>::
Annotate only the given line range. May be specified multiple times.
Overlapping ranges are allowed.
+
<start> and <end> are optional. ``-L <start>'' or ``-L <start>,'' spans from
<start> to end of file. ``-L ,<end>'' spans from start of file to <end>.
+
include::line-range-format.txt[]
-l::
Show long rev (Default: off).
-t::
Show raw timestamp (Default: off).
-S <revs-file>::
Use revisions from revs-file instead of calling linkgit:git-rev-list[1].
--reverse <rev>..<rev>::
Walk history forward instead of backward. Instead of showing
the revision in which a line appeared, this shows the last
revision in which a line has existed. This requires a range of
revision like START..END where the path to blame exists in
START. `git blame --reverse START` is taken as `git blame
--reverse START..HEAD` for convenience.
-p::
--porcelain::
Show in a format designed for machine consumption.
--line-porcelain::
Show the porcelain format, but output commit information for
each line, not just the first time a commit is referenced.
Implies --porcelain.
--incremental::
Show the result incrementally in a format designed for
machine consumption.
--encoding=<encoding>::
Specifies the encoding used to output author names
and commit summaries. Setting it to `none` makes blame
output unconverted data. For more information see the
discussion about encoding in the linkgit:git-log[1]
manual page.
--contents <file>::
When <rev> is not specified, the command annotates the
changes starting backwards from the working tree copy.
This flag makes the command pretend as if the working
tree copy has the contents of the named file (specify
`-` to make the command read from the standard input).
--date <format>::
Specifies the format used to output dates. If --date is not
provided, the value of the blame.date config variable is
used. If the blame.date config variable is also not set, the
iso format is used. For supported values, see the discussion
of the --date option at linkgit:git-log[1].
--[no-]progress::
Progress status is reported on the standard error stream
by default when it is attached to a terminal. This flag
enables progress reporting even if not attached to a
terminal. Can't use `--progress` together with `--porcelain`
or `--incremental`.
-M[<num>]::
Detect moved or copied lines within a file. When a commit
moves or copies a block of lines (e.g. the original file
has A and then B, and the commit changes it to B and then
A), the traditional 'blame' algorithm notices only half of
the movement and typically blames the lines that were moved
up (i.e. B) to the parent and assigns blame to the lines that
were moved down (i.e. A) to the child commit. With this
option, both groups of lines are blamed on the parent by
running extra passes of inspection.
+
<num> is optional but it is the lower bound on the number of
alphanumeric characters that Git must detect as moving/copying
within a file for it to associate those lines with the parent
commit. The default value is 20.
-C[<num>]::
In addition to `-M`, detect lines moved or copied from other
files that were modified in the same commit. This is
useful when you reorganize your program and move code
around across files. When this option is given twice,
the command additionally looks for copies from other
files in the commit that creates the file. When this
option is given three times, the command additionally
looks for copies from other files in any commit.
+
<num> is optional but it is the lower bound on the number of
alphanumeric characters that Git must detect as moving/copying
between files for it to associate those lines with the parent
commit. And the default value is 40. If there are more than one
`-C` options given, the <num> argument of the last `-C` will
take effect.
--ignore-rev <rev>::
Ignore changes made by the revision when assigning blame, as if the
change never happened. Lines that were changed or added by an ignored
commit will be blamed on the previous commit that changed that line or
nearby lines. This option may be specified multiple times to ignore
more than one revision. If the `blame.markIgnoredLines` config option
is set, then lines that were changed by an ignored commit and attributed to
another commit will be marked with a `?` in the blame output. If the
`blame.markUnblamableLines` config option is set, then those lines touched
by an ignored commit that we could not attribute to another revision are
marked with a '*'.
--ignore-revs-file <file>::
Ignore revisions listed in `file`, which must be in the same format as an
`fsck.skipList`. This option may be repeated, and these files will be
processed after any files specified with the `blame.ignoreRevsFile` config
option. An empty file name, `""`, will clear the list of revs from
previously processed files.
-h::
Show help message.