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| -rw-r--r-- | lib/default.nix | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/default.nix b/lib/default.nix index 1a57df266..280f04299 100644 --- a/lib/default.nix +++ b/lib/default.nix @@ -187,6 +187,30 @@ let in filter (x: x != []) ([acc.chunk] ++ acc.chunks); + # Filter adjacent duplicate elements. + uniq = uniqBy eq; + + # Filter adjacent duplicate elements determined via the given function. + uniqBy = cmp: let + f = a: s: + if length s == 0 then + [] + else let + b = head s; + in + if cmp a b then + f b (tail s) + else + [b] ++ f b (tail s); + in + s: + if length s == 0 then + [] + else let + b = head s; + in + [b] ++ f b (tail s); + warnOldVersion = oldName: newName: if compareVersions oldName newName != -1 then trace "Upstream `${oldName}' gets overridden by `${newName}'." newName |