improve the debugging experience when line directives are used

compiler/cgen.nim

@@ -215,7 +215,7 @@ proc genLineDir(p: BProc, t: PNode) =
       {optLineTrace, optStackTrace}) and
       (p.prc == nil or sfPure notin p.prc.flags) and tt.info.fileIndex >= 0:
     if freshLineInfo(p, tt.info):
-      linefmt(p, cpsStmts, "nimln_($1, $2);$N",
+      linefmt(p, cpsStmts, "nimln_($1, $2);$n",
               line.rope, tt.info.quotedFilename)
 
 proc postStmtActions(p: BProc) {.inline.} =
@@ -394,7 +394,8 @@ proc assignLocalVar(p: BProc, s: PSym) =
   #assert(s.loc.k == locNone) # not yet assigned
   # this need not be fulfilled for inline procs; they are regenerated
   # for each module that uses them!
-  let decl = localVarDecl(p, s) & ";" & tnl
+  let nl = if optLineDir in gOptions: "" else: tnl
+  let decl = localVarDecl(p, s) & ";" & nl
   line(p, cpsLocals, decl)
   localDebugInfo(p, s)
 
@@ -627,11 +628,11 @@ proc initFrame(p: BProc, procname, filename: Rope): Rope =
   discard cgsym(p.module, "nimFrame")
   if p.maxFrameLen > 0:
     discard cgsym(p.module, "VarSlot")
-    result = rfmt(nil, "\tnimfrs_($1, $2, $3, $4)$N",
+    result = rfmt(nil, "\tnimfrs_($1, $2, $3, $4);$n",
                   procname, filename, p.maxFrameLen.rope,
                   p.blocks[0].frameLen.rope)
   else:
-    result = rfmt(nil, "\tnimfr_($1, $2)$N", procname, filename)
+    result = rfmt(nil, "\tnimfr_($1, $2);$n", procname, filename)
 
 proc deinitFrame(p: BProc): Rope =
   result = rfmt(p.module, "\t#popFrame();$n")
@@ -1311,6 +1312,7 @@ proc myProcess(b: PPassContext, n: PNode): PNode =
   if b == nil or passes.skipCodegen(n): return
   var m = BModule(b)
   m.initProc.options = initProcOptions(m)
+  softRnl = if optLineDir in gOptions: noRnl else: rnl
   genStmts(m.initProc, n)
 
 proc finishModule(m: BModule) =

compiler/ropes.nim

@@ -228,6 +228,7 @@ proc prepend*(a: var Rope, b: string) = a = b & a
 var
   rnl* = tnl.newRope
   softRnl* = tnl.newRope
+  noRnl* = "".newRope
 
 proc `%`*(frmt: FormatStr, args: openArray[Rope]): Rope =
   var i = 0