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reduce re-computation

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Nix is not smart enough to promote calculated thunks to constants
between function invocations
This commit is contained in:
zimbatm 2018-04-08 12:43:42 +01:00
parent 13c120327c
commit 153673db9e
1 changed files with 5 additions and 5 deletions
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10
snack/default.nix
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@ -13,14 +13,14 @@ let
# that file only) # that file only)
singleOut = base: file: singleOut = base: file:
let let
basePrefix = (builtins.toString base) + "/";
pred = file: path: type: pred = file: path: type:
let let
topLevel = (builtins.toString base) + "/"; actual = (pkgs.lib.strings.removePrefix basePrefix path);
actual = (pkgs.lib.strings.removePrefix topLevel path);
expected = file; expected = file;
in in
(expected == actual) || (expected == actual) ||
(type == "directory" && (pkgs.lib.strings.hasPrefix actual expected)); (type == "directory" && (pkgs.lib.strings.hasPrefix actual expected));
mod = fileToModule file; mod = fileToModule file;
# TODO: even though we're doing a lot of cleaning, there's sitll some # TODO: even though we're doing a lot of cleaning, there's sitll some
# 'does-file-exist' happening # 'does-file-exist' happening