comparison mercurial/patch.py @ 9123:360f61c2919f

Make patch.diff filelog cache LRU of 20 files. Fixes issue1738.
20 files is as fast as 200 for hg diff -r 28015:30103 of mozilla-central.
Ideally we'd use util.lrucachefunc, but the interface doesn't quite work.

9122:a9eae2f3241c

        opts = mdiff.defaultopts

    if not node1:
        node1 = repo.dirstate.parents()[0]

    flcache = {}
    def getfilectx(f, ctx):
        flctx = ctx.filectx(f, filelog=flcache.get(f))
        if f not in flcache:
            flcache[f] = flctx._filelog
        return flctx

    ctx1 = repo[node1]
    ctx2 = repo[node2]

    if not changes:

9123:360f61c2919f

        opts = mdiff.defaultopts

    if not node1:
        node1 = repo.dirstate.parents()[0]

    def lrugetfilectx():
        cache = {}
        order = []
        def getfilectx(f, ctx):
            fctx = ctx.filectx(f, filelog=cache.get(f))
            if f not in cache:
                if len(cache) > 20:
                    del cache[order.pop(0)]
                cache[f] = fctx._filelog
            else:
                order.remove(f)
            order.append(f)
            return fctx
        return getfilectx
    getfilectx = lrugetfilectx()

    ctx1 = repo[node1]
    ctx2 = repo[node2]

    if not changes: