treewide: simplify rev/repo arguments in src

+ use fetchFromGithub where possible

pkgs/tools/misc/ddate/default.nix

@@ -1,10 +1,13 @@
-{stdenv, fetchgit, cmake} :
+{stdenv, fetchFromGitHub, cmake} :
 
-stdenv.mkDerivation {
-  name = "ddate-0.2.2";
-  src = fetchgit {
-    url = "https://github.com/bo0ts/ddate";
-    rev = "refs/tags/v0.2.2";
+stdenv.mkDerivation rec {
+  pname = "ddate";
+  version = "0.2.2";
+
+  src = fetchFromGitHub {
+    owner = "bo0ts";
+    repo = pname;
+    rev = "refs/tags/v${version}";
     sha256 = "1qchxnxvghbma6gp1g78wnjxsri0b72ha9axyk31cplssl7yn73f";
   };
 
@@ -14,7 +17,7 @@ stdenv.mkDerivation {
     homepage = "https://github.com/bo0ts/ddate";
     description = "Discordian version of the date program";
     license = stdenv.lib.licenses.publicDomain;
-    maintainers = with stdenv.lib.maintainers; [kovirobi];
+    maintainers = with stdenv.lib.maintainers; [ kovirobi ];
     platforms = stdenv.lib.platforms.all;
   };
 }

pkgs/tools/misc/eva/default.nix

@@ -8,7 +8,7 @@ rustPlatform.buildRustPackage rec {
 
   src = fetchFromGitHub {
     owner = "NerdyPepper";
-    repo = "${pname}";
+    repo = pname;
     rev = "6ce0fc0212a34ffb647b24d9d903029ac4518165";
     sha256 = "10242vnq2ph0g3p2hdacs4lmx3f474xm04nadplxbpv9xh4nbag3";
   };

pkgs/tools/misc/nix-direnv/default.nix

@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "nix-community";
     repo = "nix-direnv";
-    rev = "${version}";
+    rev = version;
     sha256 = "sha256-xMz6e0OLeB3eltGrLV3Hew0lMjH5LSgqJ1l7JT2Ho/M=";
   };
 

pkgs/tools/misc/rpcsvc-proto/default.nix

@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
 
   src = fetchFromGitHub {
     owner = "thkukuk";
-    repo = "${pname}";
+    repo = pname;
     rev = "v${version}";
     sha256 = "006l1f824r9bcbwn1s1vbs33cdwhs66jn6v97yas597y884y40z9";
   };