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Paul Mackerras 6e8c870703 gitk: Establish and use global left-to-right ordering for commits ... This creates an "ordering token" for each commit which establishes a total ordering for commits and is used to order the commits from left to right on a row. The ordering token is assigned when a commit is first encountered or when it is first listed as a parent of some other commit, whichever comes first. The ordering token is a string of variable length. Parents that don't already have an ordering token are assigned one by appending to the child's token; the first parent gets a "0" on the end, the second "1" and so on. As an optimization, the "0" isn't appended if the child only has one parent. When inserting a new commit into an element of rowidlist, it is inserted in the position which makes the ordering tokens increase from left to right. This also simplifies the layout code by getting rid of the rowoffsets variable, and terminates lines with an arrow after 5 rows if the line would be longer than about 110 rows (rather than letting them go on and terminating them later with an arrow if the graph gets too wide). The effect of having the total ordering, and terminating the lines early, is that it will be possible to lay out only a part of the graph rather than having to do the whole thing top to bottom. Signed-off-by: Paul Mackerras <paulus@samba.org>		2007-07-31 21:03:06 +10:00
gitk	gitk: Establish and use global left-to-right ordering for commits	2007-07-31 21:03:06 +10:00