lib: Add getName to mirror getVersion

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/strings.nix b/lib/strings.nix
index ae0d74c6721d..6dbb3d3a3e8b 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -473,6 +473,23 @@ rec {
   versionAtLeast = v1: v2: !versionOlder v1 v2;
 
   /* This function takes an argument that's either a derivation or a
+     derivation's "name" attribute and extracts the name part from that
+     argument.
+
+     Example:
+       getName "youtube-dl-2016.01.01"
+       => "youtube-dl"
+       getName pkgs.youtube-dl
+       => "youtube-dl"
+  */
+  getName = x:
+   let
+     parse = drv: (builtins.parseDrvName drv).name;
+   in if isString x
+      then parse x
+      else x.pname or (parse x.name);
+
+  /* This function takes an argument that's either a derivation or a
      derivation's "name" attribute and extracts the version part from that
      argument.