From 84a105254d52d8ded6c5365399b61bea14505cd7 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Sun, 24 Nov 2019 16:19:32 +0000
Subject: [PATCH] lib: Add getName to mirror getVersion

---
 lib/default.nix |  3 ++-
 lib/strings.nix | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/default.nix b/lib/default.nix
index 18d2dfae1e1..0e840dd6c9e 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -84,7 +84,8 @@ let
       hasInfix hasPrefix hasSuffix stringToCharacters stringAsChars escape
       escapeShellArg escapeShellArgs replaceChars lowerChars
       upperChars toLower toUpper addContextFrom splitString
-      removePrefix removeSuffix versionOlder versionAtLeast getVersion
+      removePrefix removeSuffix versionOlder versionAtLeast
+      getName getVersion
       nameFromURL enableFeature enableFeatureAs withFeature
       withFeatureAs fixedWidthString fixedWidthNumber isStorePath
       toInt readPathsFromFile fileContents;
diff --git a/lib/strings.nix b/lib/strings.nix
index ae0d74c6721..6dbb3d3a3e8 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -472,6 +472,23 @@ 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.