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authorGravatar Joey Hess <joey@kitenet.net>2014-01-20 04:11:42 -0400
committerGravatar Joey Hess <joey@kitenet.net>2014-01-20 04:57:36 -0400
commit329ec5d1e67f3a3ed6110fa4a97ec33ef1fbbdde (patch)
tree1df3cf2fad901b30a4beda16762001e5ff0374eb /Command/Help.hs
parentbd4c5bc7ba1431454a60e9696dc6856dc4ad3a9e (diff)
fix inversion of control in CommandSeek (no behavior changes)
I've been disliking how the command seek actions were written for some time, with their inversion of control and ugly workarounds. The last straw to fix it was sync --content, which didn't fit the Annex [CommandStart] interface well at all. I have not yet made it take advantage of the changed interface though. The crucial change, and probably why I didn't do it this way from the beginning, is to make each CommandStart action be run with exceptions caught, and if it fails, increment a failure counter in annex state. So I finally remove the very first code I wrote for git-annex, which was before I had exception handling in the Annex monad, and so ran outside that monad, passing state explicitly as it ran each CommandStart action. This was a real slog from 1 to 5 am. Test suite passes. Memory usage is lower than before, sometimes by a couple of megabytes, and remains constant, even when running in a large repo, and even when repeatedly failing and incrementing the error counter. So no accidental laziness space leaks. Wall clock speed is identical, even in large repos. This commit was sponsored by an anonymous bitcoiner.
Diffstat (limited to 'Command/Help.hs')
-rw-r--r--Command/Help.hs4
1 files changed, 2 insertions, 2 deletions
diff --git a/Command/Help.hs b/Command/Help.hs
index 71e767663..5292c3ca3 100644
--- a/Command/Help.hs
+++ b/Command/Help.hs
@@ -26,8 +26,8 @@ def :: [Command]
def = [noCommit $ noRepo startNoRepo $ dontCheck repoExists $
command "help" paramNothing seek SectionQuery "display help"]
-seek :: [CommandSeek]
-seek = [withWords start]
+seek :: CommandSeek
+seek = withWords start
start :: [String] -> CommandStart
start params = do