comparison hgext/histedit.py @ 45450:47d10ade5bc4

histedit: cache description line

Navigating the curses-based histedit interface can be pretty slow
because it redraws everything whenever you make a change.

This patch simply replaces `@property` by `@util.propertycache` on the
`histeditrule.desc()` function so it's not re-calculated every time
the screen needs to be re-rendered. I timed it on an example of 30
simple commits, where I moved the top commit down 25 steps and then up
25 steps after. Before this patch, that (the whole `hg histedit`
invocation) took 11.6 s of CPU and after this patch it took 0.8 s).

Differential Revision: https://phab.mercurial-scm.org/D9016

45449:814c7430f828

            action.ljust(6),
            r,
            h,
        )

    @property
    def desc(self):
        summary = (
            cmdutil.rendertemplate(
                self.ctx, self.ui.config(b'histedit', b'summary-template')
            )

45450:47d10ade5bc4

            action.ljust(6),
            r,
            h,
        )

    @util.propertycache
    def desc(self):
        summary = (
            cmdutil.rendertemplate(
                self.ctx, self.ui.config(b'histedit', b'summary-template')
            )