git: replace gitToInit with lib function

Remove the function gitToInit and underlying functions in favor of using
the function lib.generators.toGitINI from nixpkgs.

modules/programs/git.nix

@@ -6,50 +6,6 @@ let
 
   cfg = config.programs.git;
 
-  # create [section "subsection"] keys from "section.subsection" attrset names
-  mkSectionName = name:
-    let
-      containsQuote = strings.hasInfix ''"'' name;
-      sections = splitString "." name;
-      section = head sections;
-      subsections = tail sections;
-      subsection = concatStringsSep "." subsections;
-    in if containsQuote || subsections == [ ] then
-      name
-    else
-      ''${section} "${subsection}"'';
-
-  mkValueString = v:
-    let
-      escapedV = ''
-        "${
-          replaceStrings [ "\n" "	" ''"'' "\\" ] [ "\\n" "\\t" ''\"'' "\\\\" ] v
-        }"'';
-    in generators.mkValueStringDefault { } (if isString v then escapedV else v);
-
-  # generation for multiple ini values
-  mkKeyValue = k: v:
-    let
-      mkKeyValue =
-        generators.mkKeyValueDefault { inherit mkValueString; } " = " k;
-    in concatStringsSep "\n" (map (kv: "	" + mkKeyValue kv) (toList v));
-
-  # converts { a.b.c = 5; } to { "a.b".c = 5; } for toINI
-  gitFlattenAttrs = let
-    recurse = path: value:
-      if isAttrs value then
-        mapAttrsToList (name: value: recurse ([ name ] ++ path) value) value
-      else if length path > 1 then {
-        ${concatStringsSep "." (reverseList (tail path))}.${head path} = value;
-      } else {
-        ${head path} = value;
-      };
-  in attrs: foldl recursiveUpdate { } (flatten (recurse [ ] attrs));
-
-  gitToIni = attrs:
-    let toIni = generators.toINI { inherit mkKeyValue mkSectionName; };
-    in toIni (gitFlattenAttrs attrs);
-
   gitIniType = with types;
     let
       primitiveType = either str (either bool int);
@@ -137,7 +93,7 @@ let
     };
     config.path = mkIf (config.contents != { }) (mkDefault
       (pkgs.writeText (hm.strings.storeFileName config.contentSuffix)
-        (gitToIni config.contents)));
+        (generators.toGitINI config.contents)));
   });
 
 in {
@@ -415,7 +371,7 @@ in {
       };
 
       xdg.configFile = {
-        "git/config".text = gitToIni cfg.iniContent;
+        "git/config".text = generators.toGitINI cfg.iniContent;
 
         "git/ignore" = mkIf (cfg.ignores != [ ]) {
           text = concatStringsSep "\n" cfg.ignores + "\n";
@@ -502,8 +458,8 @@ in {
           } else {
             include.path = "${path}";
           };
-      in mkAfter
+      in mkAfter (concatStringsSep "\n"
-      (concatStringsSep "\n" (map gitToIni (map include cfg.includes)));
+        (map generators.toGitINI (map include cfg.includes)));
     })
 
     (mkIf cfg.lfs.enable {