[driver] Remove the 'swift-fixit' symlink and introduce '-emit-fixits-path' frontend option that

writes compiler fixits as source edits.

Driver option '-fixit-code' adds '-emit-fixits-path' for all the frontend invocations.

Swift SVN r27208

include/swift/AST/DiagnosticsFrontend.def

@@ -46,6 +46,8 @@ ERROR(error_no_frontend_args, frontend, none,
 ERROR(error_no_such_file_or_directory,frontend,none,
   "no such file or directory: '%0'", (StringRef))
 
+ERROR(cannot_open_file,frontend,none,
+  "cannot open file '%0' (%1)", (StringRef, StringRef))
 ERROR(cannot_open_serialized_file,frontend,none,
   "cannot open file '%0' for diagnostics emission (%1)", (StringRef, StringRef))
 ERROR(error_open_input_file,frontend,none,

include/swift/Driver/Driver.h

@@ -68,9 +68,6 @@ public:
 
     /// Invoke swift-update with the compiler frontend options.
     UpdateCode,
-
-    /// Invoke swift-fixit with the compiler frontend options.
-    FixCode,
   };
 
   /// The mode in which the driver should invoke the frontend.
@@ -99,6 +96,9 @@ public:
 
   /// Whether the compiler picked the current module name, rather than the user.
   bool ModuleNameIsFallback = false;
+
+  // Whether the driver should generate compiler fixits as source edits.
+  bool ShouldGenerateFixitEdits = false;
   
   /// The number of threads for multi-threaded compilation.
   unsigned numThreads = 0;
@@ -121,7 +121,6 @@ public:
   enum class DriverKind {
     Interactive,     // swift
     Batch,           // swiftc
-    FixCode,         // swift-fixit
     AutolinkExtract, // swift-autolink-extract
   };
 

include/swift/Frontend/FrontendOptions.h

@@ -112,6 +112,9 @@ public:
   /// The path to which we should output a Swift reference dependencies file.
   std::string ReferenceDependenciesFilePath;
 
+  /// The path to which we should output a fixits as source edits.
+  std::string FixitsOutputPath;
+
   /// Arguments which should be passed in immediate mode.
   std::vector<std::string> ImmediateArgv;
 

include/swift/Option/FrontendOptions.td

@@ -49,6 +49,10 @@ def serialize_diagnostics_path
   : Separate<["-"], "serialize-diagnostics-path">, MetaVarName<"<path>">,
     HelpText<"Output serialized diagnostics to <path>">;
 
+def emit_fixits_path
+  : Separate<["-"], "emit-fixits-path">, MetaVarName<"<path>">,
+    HelpText<"Output compiler fixits as source edits to <path>">;
+
 def verify : Flag<["-"], "verify">,
   HelpText<"Verify diagnostics against expected-{error|warning|note} "
            "annotations">;

include/swift/Option/Options.td

@@ -84,7 +84,7 @@ def driver_use_frontend_path : Separate<["-"], "driver-use-frontend-path">,
   HelpText<"Use the given executable to perform compilations">;
 
 def driver_mode : Joined<["--"], "driver-mode=">, Flags<[HelpHidden]>,
-  HelpText<"Set the driver mode to either 'swift' or 'swiftc' or 'swift-fixit'">;
+  HelpText<"Set the driver mode to either 'swift' or 'swiftc'">;
 
 def help : Flag<["-", "--"], "help">,
   Flags<[FrontendOption, AutolinkExtractOption]>,
@@ -336,8 +336,8 @@ def update_code : Flag<["-"], "update-code">,
   Flags<[HelpHidden, NoInteractiveOption, DoesNotAffectIncrementalBuild]>;
 
 def fixit_code : Flag<["-"], "fixit-code">,
-  HelpText<"Get compiler fixits as code edits">, ModeOpt,
-  Flags<[HelpHidden, NoInteractiveOption, DoesNotAffectIncrementalBuild]>;
+  HelpText<"Get compiler fixits as code edits">,
+  Flags<[NoInteractiveOption, DoesNotAffectIncrementalBuild]>;
 
 // No Output Modes
 def parse : Flag<["-"], "parse">,