Recover the original way of sending file contexts to idemode clients

src/Idris/REPL/Common.idr

@@ -1,7 +1,8 @@
 module Idris.REPL.Common
 
-import Core.Env
 import Core.Context.Log
+import Core.Directory
+import Core.Env
 import Core.InitPrimitives
 import Core.Metadata
 import Core.Primitives
@@ -80,9 +81,19 @@ emitProblem a replDocCreator idemodeDocCreator getFC
                      -- TODO: Display a better message when the error doesn't contain a location
                      case map toNonEmptyFC (getFC a) of
                           Nothing => iputStrLn msg
-                          Just (file, startPos, endPos) =>
+                          Just (origin, startPos, endPos) => do
+                            fname <- case origin of
+                              PhysicalIdrSrc ident => do
+                                -- recover the file name relative to the working directory.
+                                -- (This is what idris2-mode expects)
+                                let fc = MkFC (PhysicalIdrSrc ident) startPos endPos
+                                catch (nsToSource fc ident) (const $ pure "(File-Not-Found)")
+                              PhysicalPkgSrc fname =>
+                                pure fname
+                              Virtual Interactive =>
+                                pure "(Interactive)"
                             send f (SExpList [SymbolAtom "warning",
-                                   SExpList [toSExp (show file),
+                                   SExpList [toSExp {a = String} fname,
                                             toSExp (addOne startPos),
                                               toSExp (addOne endPos),
                                               toSExp !(renderWithoutColor msg),