Clean up stdin file reading of compiler.

Uses "stdinfile" as the module identifier now, which prevents problems
with - colliding with the minus operator. This fixes #2422 and #2702.

compiler/main.nim

@@ -63,7 +63,7 @@ proc commandCompileToC =
   compileProject()
   cgenWriteModules()
   if gCmd != cmdRun:
-    extccomp.callCCompiler(if gProjectName == "-": "stdinfile" else: changeFileExt(gProjectFull, ""))
+    extccomp.callCCompiler(changeFileExt(gProjectFull, ""))
 
   if isServing:
     # caas will keep track only of the compilation commands

compiler/modules.nim

@@ -11,7 +11,7 @@
 
 import
   ast, astalgo, magicsys, crc, rodread, msgs, cgendata, sigmatch, options,
-  idents, os, lexer, idgen, passes, syntaxes
+  idents, os, lexer, idgen, passes, syntaxes, llstream
 
 type
   TNeedRecompile* = enum Maybe, No, Yes, Probing, Recompiled
@@ -116,7 +116,7 @@ proc newModule(fileIdx: int32): PSym =
   result.kind = skModule
   let filename = fileIdx.toFullPath
   result.name = getIdent(splitFile(filename).name)
-  if result.name.s != "-" and not isNimIdentifier(result.name.s):
+  if not isNimIdentifier(result.name.s):
     rawMessage(errInvalidModuleName, result.name.s)
 
   result.info = newLineInfo(fileIdx, 1, 1)
@@ -148,6 +148,9 @@ proc compileModule*(fileIdx: int32, flags: TSymFlags): PSym =
         return
     else:
       result.id = getID()
+    if sfMainModule in flags and gProjectName == "-":
+      processModule(result, llStreamOpen(stdin), rd)
+    else:
       processModule(result, nil, rd)
     if optCaasEnabled in gGlobalOptions:
       gMemCacheData[fileIdx].compiledAt = gLastCmdTime

compiler/nim.nim

@@ -38,7 +38,11 @@ proc handleCmdLine() =
   else:
     # Process command line arguments:
     processCmdLine(passCmd1, "")
-    if gProjectName != "":
+    if gProjectName == "-":
+      gProjectName = "stdinfile"
+      gProjectFull = "stdinfile"
+      gProjectPath = getCurrentDir()
+    elif gProjectName != "":
       try:
         gProjectFull = canonicalizePath(gProjectName)
       except OSError:
@@ -61,8 +65,6 @@ proc handleCmdLine() =
         if gCmd == cmdRun:
           tccgen.run(commands.arguments)
       if optRun in gGlobalOptions:
-        if gProjectName == "-":
-          gProjectFull = "stdinfile"
         if gCmd == cmdCompileToJS:
           var ex: string
           if options.outFile.len > 0:

compiler/passes.nim

@@ -170,10 +170,6 @@ proc processModule(module: PSym, stream: PLLStream, rd: PRodReader) =
     openPasses(a, module)
     if stream == nil:
       let filename = fileIdx.toFullPathConsiderDirty
-      if module.name.s == "-":
-        module.name.s = "stdinfile"
-        s = llStreamOpen(stdin)
-      else:
       s = llStreamOpen(filename, fmRead)
       if s == nil:
         rawMessage(errCannotOpenFile, filename)