brz log command shows a list of previous revisions.
brz log supports the
% brz log -r 1000.. # Revision 1000 and everything after it % brz log -r ..1000 # Everything up to and including r1000 % brz log -r 1000..1100 # changes from 1000 to 1100 % brz log -r 1000 # The changes in only revision 1000
Viewing merged revisions¶
As distributed VCS tools like Breezy make merging much easier than it is in central VCS tools, the history of a branch may often contain lines of development splitting off the mainline and merging back in at a later time. Technically, the relationship between the numerous revision nodes is known as a Directed Acyclic Graph or DAG for short.
In many cases, you typically want to see the mainline first and drill down from there. The default behaviour of log is therefore to show the mainline and indicate which revisions have nested merged revisions. To explore the merged revisions for revision X, use the following command:
brz log -n0 -rX
To see all revisions and all their merged revisions:
brz log -n0
Note that the -n option is used to indicate the number of levels to display
where 0 means all. If that is too noisy, you can easily adjust the number
to only view down so far. For example, if your project is structured with
a top level gatekeeper merging changes from team gatekeepers,
shows what the top level gatekeeper did while
brz log -n2 shows what
the team gatekeepers did. In the vast majority of cases though,
Tuning the output¶
log command has several options that are useful for tuning
the output. These include:
--forwardpresents the log in chronological order, i.e. the most recent revisions are displayed last.
--limitoption controls the maximum number of revisions displayed.
See the online help for the log command or the User Reference for more information on tuning the output.
Viewing the history for a file¶
It is often useful to filter the history so that it only
applies to a given file. To do this, provide the filename
log command like this:
brz log foo.py
Viewing an old version of a file¶
To get the contents of a file at a given version, use the
cat command like this:
brz cat -r X file
X is the revision identifier and
the filename. This will send output to the standard output
stream so you’ll typically want to pipe the output through
a viewing tool (like
more) or redirect it
brz cat -r -2 foo.py | less brz cat -r 1 foo.py > /tmp/foo-1st-version.py
Graphical history viewers¶
History browsing is one area where GUI tools really make life easier. Breezy has numerous plug-ins that provide this capability including QBzr and brz-gtk. See Using plugins for details on how to install these if they are not already installed.
To use the graphical viewer from QBzr:
To use the graphical viewer from brz-gtk:
viz is actually a built-in alias for
visualize so use the longer
command name if you prefer.