ghq: Migrate to buildGoModule, ensure go 1.13 compatibility

pkgs/applications/version-management/git-and-tools/ghq/default.nix

@@ -1,11 +1,9 @@
-{ stdenv, buildGoPackage, fetchFromGitHub }:
+{ stdenv, buildGoModule, fetchFromGitHub, fetchpatch }:
 
-buildGoPackage rec {
+buildGoModule rec {
   pname = "ghq";
   version = "0.12.6";
 
-  goPackagePath = "github.com/motemen/ghq";
-
   src = fetchFromGitHub {
     owner = "motemen";
     repo = "ghq";
@@ -13,7 +11,7 @@ buildGoPackage rec {
     sha256 = "14rm7fvphr7r9x0ys10vhzjwhfhhscgr574n1i1z4lzw551lrnp4";
   };
 
-  goDeps = ./deps.nix;
+  modSha256 = "1y2v8ir7kc2avgri06nagfyaxqr3xrg4g5pxl9rwzq9dyzm6ci5z";
 
   buildFlagsArray = ''
     -ldflags=
@@ -21,9 +19,17 @@ buildGoPackage rec {
   '';
 
   postInstall = ''
-    install -m 444 -D ${src}/zsh/_ghq $bin/share/zsh/site-functions/_ghq
+    install -m 444 -D ${src}/zsh/_ghq $out/share/zsh/site-functions/_ghq
   '';
 
+  patches = [
+    (fetchpatch {
+      # remove once the commit lands in a release.
+      url = "https://github.com/motemen/ghq/commit/38ac89e60e60182b5870108f9753c9fe8d00e4a6.patch";
+      sha256 = "1z8yvzmka3sh44my6jnwc39p8zs7mczxgvwc9z0pkqk4vgvaj8gj";
+    })
+  ];
+
   meta = {
     description = "Remote repository management made easy";
     homepage = https://github.com/motemen/ghq;