Copyright (c) 2017-2025 Edmundo Carmona Antoranz Released under the terms of GPLv2
git diff blame
Show the output of git diff with the additional information of git blame for added/removed lines so that it's 'trivial' to find out who did what.
Lines that remain the same or that were added will indicate when those lines
were added to the file.
Lines that were removed will display the commit where the line was removed.
When it's not possible to pinpoint the commit where it was deleted, the last
commit where that line was present is reported instead (as reported by
git blame --reverse). When this happens, a percentage sign (%) will be used as
the prefix of the deleted line (instead of the usual -).
Example output (from difflame project itself, two commits apart):
$ ./difflame c4dae4fdd8ba883 97d230ce523
diff --git a/difflame.py b/difflame.py
index ff65112..ec21fcd 100755
--- a/difflame.py
+++ b/difflame.py
@@ -51,7 +51,7 @@ REVISIONS_INFO_CACHE=dict()
9d2e8d4 (Edmundo Carmona Antoranz 2017-02-02 22:11:09 51 51)
18ecda8 (Edmundo Carmona Antoranz 2017-02-15 00:42:18 52 52) '''
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 53 53) caches to save:
cd789a5: removing an unnecessary TODO
-cd789a5 (Edmundo Carmona Antoranz 2017-02-15 01:10:15 54 ) - reverse blamed files # TODO consider cleaning this when we finish processing a file
+cd789a5 (Edmundo Carmona Antoranz 2017-02-15 01:10:15 54) - reverse blamed files
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 55 55) - diff of files when analyzing revisions (merges and so on)
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 56 56)
18ecda8 (Edmundo Carmona Antoranz 2017-02-15 00:42:18 57 57) BLAMED_FILES_CACHE[originating_revision][final_revision][filename] = lines
@@ -120,7 +120,7 @@ class DiffFileObject:
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 120 120) file_name = file_name[2:]
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 121 121)
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 122 122) # starting to build git command arguments
97d230c: Print filenames appropiately on deleted lines
-97d230c (Edmundo Carmona Antoranz 2017-02-15 19:51:46 123 ) git_blame_opts=["blame", "--no-progress"]
+97d230c (Edmundo Carmona Antoranz 2017-02-15 19:51:46 123) git_blame_opts = []
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 124 124)
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 125 125) for hunk_position in hunk_positions:
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 126 126) hunk_position = hunk_position.split(',')
Notice how a 'hint' line is printed for lines that are removed/added and that relate to the same commit. This is so that it's possible to get a little more information about the commit itself without having to resort to an additional call to git show.
You can provide one or two committishes. If you provide only one, HEAD will be assumed to be the second committish.
You can also provide paths (which will be proxied into git diff) after --.
Parameters can be sent to git diff by using option --diff-param (or -dp), for
example: --diff-param=--color
Multiple parameters are possible, each one having a separate --diff-param/-dp.
Most times, different options will change diff output and it will break difflame
Parameters can be sent to git blame by using option --blame-param (or -bp), for
example: --blame-param=-l -bp=-t
Multiple parameters are possible, each one having a separate --blame-param/-bp:
--color/--no-color: output with/without color. If user doesn't specify --color/--no-color options then output will use color if process is connected to a terminal
-e: show mail addresses of authors instead of their names.
-s: short output
--progress/--no-progress: progress is shown by default if running the process on a tty. These options can be used to force showing/hiding it.
-w: skip space changes (in both diff and blame)
--no-hints: when printing added/removed lines, do not provide the hint (one-line summary of the commit) before the lines themselves. If a number of added/removed lines belong to the same commit one after the other, a single hint line would be printed before them. It would have looked something like this with hints disabled:
diff --git a/difflame.py b/difflame.py
index ff65112..ec21fcd 100755
--- a/difflame.py
+++ b/difflame.py
@@ -51,7 +51,7 @@ REVISIONS_INFO_CACHE=dict()
9d2e8d4 (Edmundo Carmona Antoranz 2017-02-02 22:11:09 51 51)
18ecda8 (Edmundo Carmona Antoranz 2017-02-15 00:42:18 52 52) '''
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 53 53) caches to save:
-cd789a5 (Edmundo Carmona Antoranz 2017-02-15 01:10:15 54 ) - reverse blamed files # TODO consider cleaning this when we finish processing a file
+cd789a5 (Edmundo Carmona Antoranz 2017-02-15 01:10:15 54) - reverse blamed files
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 55 55) - diff of files when analyzing revisions (merges and so on)
cb52676 (Edmundo Carmona Antoranz 2017-02-15 01:01:06 56 56)
18ecda8 (Edmundo Carmona Antoranz 2017-02-15 00:42:18 57 57) BLAMED_FILES_CACHE[originating_revision][final_revision][filename] = lines
@@ -120,7 +120,7 @@ class DiffFileObject:
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 120 120) file_name = file_name[2:]
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 121 121)
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 122 122) # starting to build git command arguments
-97d230c (Edmundo Carmona Antoranz 2017-02-15 19:51:46 123 ) git_blame_opts=["blame", "--no-progress"]
+97d230c (Edmundo Carmona Antoranz 2017-02-15 19:51:46 123) git_blame_opts = []
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 124 124)
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 125 125) for hunk_position in hunk_positions:
d75f61e (Edmundo Carmona Antoranz 2017-02-11 16:28:58 126 126) hunk_position = hunk_position.split(',')
--git-debug print debug information about git on stderr:
- executed commands (with total execution time in miliseconds)
- total commands run