* Add a utility function "versionOlder" to compare two version

strings.

svn path=/nixpkgs/trunk/; revision=33267
This commit is contained in:
Eelco Dolstra 2012-03-19 18:04:47 +00:00
parent af2da39a04
commit 6b4cd6673a
2 changed files with 14 additions and 1 deletions

View File

@ -82,15 +82,18 @@ rec {
map f (stringToCharacters s)
);
# same as vim escape function.
# Each character contained in list is prefixed by "\"
escape = list : string :
stringAsChars (c: if lib.elem c list then "\\${c}" else c) string;
# still ugly slow. But more correct now
# [] for zsh
escapeShellArg = lib.escape (stringToCharacters "\\ ';$`()|<>\t*[]");
# replace characters by their substitutes. This function is equivalent to
# the `tr' command except that one character can be replace by multiple
# ones. e.g.,
@ -105,10 +108,12 @@ rec {
in
stringAsChars subst s;
# Compares strings not requiring context equality
# Obviously, a workaround but works on all Nix versions
eqStrings = a: b: (a+(substring 0 0 b)) == ((substring 0 0 a)+b);
# Cut a string with a separator and produces a list of strings which were
# separated by this separator. e.g.,
# `splitString "." "foo.bar.baz"' returns ["foo" "bar" "baz"].
@ -133,6 +138,7 @@ rec {
in
recurse 0 0;
# return the suffix of the second argument if the first argument match its
# prefix. e.g.,
# `removePrefix "foo." "foo.bar.baz"' returns "bar.baz".
@ -146,6 +152,13 @@ rec {
else
s;
# Why do we need this if we have baseNameOf?
basename = s: lib.last (splitString "/" s);
# Return true iff string v1 denotes a version older than v2.
versionOlder = v1: v2: builtins.compareVersions v2 v1 == 1;
}

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@ -22,7 +22,7 @@ in stdenv.mkDerivation {
'';
meta = {
homepage = http://www.intel.com;
homepage = http://www.intel.com/;
description = "Microcode for Intel processors";
};
}