msgs: styledMsgWriteln compatible with styledEcho

1. Introduce styledMsgWriteln which can be used same way as styledEcho.

2. Make file names and positions use bright white like in other compilers, so
   only message types are colored.

compiler/msgs.nim

@@ -8,7 +8,7 @@
 #
 
 import
-  options, strutils, os, tables, ropes, platform, terminal
+  options, strutils, os, tables, ropes, platform, terminal, macros
 
 type
   TMsgKind* = enum
@@ -605,13 +605,15 @@ proc suggestQuit*() =
 # this format is understood by many text editors: it is the same that
 # Borland and Freepascal use
 const
-  PosErrorFormat* = "$1($2, $3) Error: "
-  PosWarningFormat* = "$1($2, $3) Warning: "
-  PosHintFormat* = "$1($2, $3) Hint: "
-  PosContextFormat = "$1($2, $3) Info: "
-  RawError* = "Error: "
-  RawWarning* = "Warning: "
-  RawHint* = "Hint: "
+  PosFormat    = "$1($2, $3) "
+  ErrorTitle   = "Error: "
+  ErrorColor   = fgRed
+  WarningTitle = "Warning: "
+  WarningColor = fgYellow
+  HintTitle    = "Hint: "
+  HintColor    = fgGreen
+  InfoTitle    = "Info: "
+  InfoColor    = fgCyan
 
 proc getInfoContextLen*(): int = return msgContext.len
 proc setInfoContextLen*(L: int) = setLen(msgContext, L)
@@ -686,27 +688,58 @@ proc outWriteln*(s: string) =
   ## Writes to stdout. Always.
   if eStdOut in errorOutputs: writeln(stdout, s)
 
-proc msgWriteln*(s: string, color: ForegroundColor = fgWhite, coloredText: string = "") =
-  ## Writes to stdout. If --stderr option is given, writes to stderr instead.
+proc msgWriteln*(s: string) =
+  ## Writes to stdout. If --stdout option is given, writes to stderr instead.
 
   #if gCmd == cmdIdeTools and optCDebug notin gGlobalOptions: return
 
-  var hasColor = optUseColors in gGlobalOptions
   if not isNil(writelnHook):
-    writelnHook(coloredText & s)
+    writelnHook(s)
+  elif optStdout in gGlobalOptions:
+    if eStdErr in errorOutputs: writeln(stderr, s)
   else:
-    if optStdout in gGlobalOptions:
-      if eStdErr in errorOutputs:
-        if hasColor: setForegroundColor(color)
-        write(stderr, coloredText)
-        if hasColor: resetAttributes()
-        writeln(stderr, s)
-    else:
-      if eStdOut in errorOutputs:
-        if hasColor: setForegroundColor(color)
-        write(stdout, coloredText)
-        if hasColor: resetAttributes()
-        writeln(stdout, s)
+    if eStdOut in errorOutputs: writeln(stdout, s)
+
+macro callIgnoringStyle(theProc: typed, first: typed,
+                        args: varargs[expr]): stmt =
+  let typForegroundColor = bindSym"ForegroundColor".getType
+  let typBackgroundColor = bindSym"BackgroundColor".getType
+  let typStyle = bindSym"Style".getType
+  let typTerminalCmd = bindSym"TerminalCmd".getType
+  result = newCall(theProc)
+  if first.kind != nnkNilLit: result.add(first)
+  for arg in children(args[0][1]):
+    if arg.kind == nnkNilLit: continue
+    let typ = arg.getType
+    if typ.kind != nnkEnumTy or
+       typ != typForegroundColor and
+       typ != typBackgroundColor and
+       typ != typStyle and
+       typ != typTerminalCmd:
+      result.add(arg)
+
+macro callStyledEcho(args: varargs[expr]): stmt =
+  result = newCall(bindSym"styledEcho")
+  for arg in children(args[0][1]):
+    result.add(arg)
+
+template callWritelnHook(args: varargs[string, `$`]) =
+  var s = ""
+  for arg in args:
+    s.add arg
+  writelnHook s
+
+template styledMsgWriteln*(args: varargs[expr]) =
+  if not isNil(writelnHook):
+    callIgnoringStyle(callWritelnHook, nil, args)
+  elif optStdout in gGlobalOptions:
+    if eStdErr in errorOutputs: callIgnoringStyle(writeln, stderr, args)
+  else:
+    if eStdOut in errorOutputs:
+      if optUseColors in gGlobalOptions:
+        callStyledEcho(args)
+      else:
+        callIgnoringStyle(writeln, stdout, args)
 
 proc coordToStr(coord: int): string =
   if coord == -1: result = "???"
@@ -728,7 +761,7 @@ proc handleError(msg: TMsgKind, eh: TErrorHandling, s: string) =
       if stackTraceAvailable() and isNil(writelnHook):
         writeStackTrace()
       else:
-        msgWriteln("", fgRed, "No stack traceback available\nTo create a stacktrace, rerun compilation with ./koch temp " & options.command & " <file>")
+        styledMsgWriteln(fgRed, "No stack traceback available\nTo create a stacktrace, rerun compilation with ./koch temp " & options.command & " <file>")
     quit 1
 
   if msg >= fatalMin and msg <= fatalMax:
@@ -750,10 +783,12 @@ proc writeContext(lastinfo: TLineInfo) =
   var info = lastinfo
   for i in countup(0, len(msgContext) - 1):
     if msgContext[i] != lastinfo and msgContext[i] != info:
-      msgWriteln(PosContextFormat % [toMsgFilename(msgContext[i]),
-                                   coordToStr(msgContext[i].line),
-                                   coordToStr(msgContext[i].col+1),
-                                   getMessageStr(errInstantiationFrom, "")])
+      styledMsgWriteln(styleBright,
+                       PosFormat % [toMsgFilename(msgContext[i]),
+                                    coordToStr(msgContext[i].line),
+                                    coordToStr(msgContext[i].col+1)],
+                       styleDim,
+                       getMessageStr(errInstantiationFrom, ""))
     info = msgContext[i]
 
 proc ignoreMsgBecauseOfIdeTools(msg: TMsgKind): bool =
@@ -761,29 +796,29 @@ proc ignoreMsgBecauseOfIdeTools(msg: TMsgKind): bool =
 
 proc rawMessage*(msg: TMsgKind, args: openArray[string]) =
   var
-    frmt: string
+    title: string
     color: ForegroundColor
   case msg
   of errMin..errMax:
     writeContext(unknownLineInfo())
-    frmt = RawError
-    color = fgRed
+    title = ErrorTitle
+    color = ErrorColor
   of warnMin..warnMax:
     if optWarns notin gOptions: return
     if msg notin gNotes: return
     writeContext(unknownLineInfo())
-    frmt = RawWarning
+    title = WarningTitle
+    color = WarningColor
     inc(gWarnCounter)
-    color = fgYellow
   of hintMin..hintMax:
     if optHints notin gOptions: return
     if msg notin gNotes: return
-    frmt = RawHint
+    title = HintTitle
+    color = HintColor
     inc(gHintCounter)
-    color = fgGreen
   let s = `%`(msgKindToString(msg), args)
   if not ignoreMsgBecauseOfIdeTools(msg):
-    msgWriteln(s, color, frmt)
+    styledMsgWriteln(color, title, resetStyle, s)
   handleError(msg, doAbort, s)
 
 proc rawMessage*(msg: TMsgKind, arg: string) =
@@ -795,47 +830,49 @@ proc writeSurroundingSrc(info: TLineInfo) =
   msgWriteln(indent & spaces(info.col) & '^')
 
 proc formatMsg*(info: TLineInfo, msg: TMsgKind, arg: string): string =
-  let frmt = case msg
-             of warnMin..warnMax: PosWarningFormat
-             of hintMin..hintMax: PosHintFormat
-             else: PosErrorFormat
-  result = frmt % [toMsgFilename(info), coordToStr(info.line),
-                   coordToStr(info.col+1), getMessageStr(msg, arg)]
+  let title = case msg
+              of warnMin..warnMax: WarningTitle
+              of hintMin..hintMax: HintTitle
+              else: ErrorTitle
+  result = PosFormat % [toMsgFilename(info), coordToStr(info.line),
+                        coordToStr(info.col+1)] &
+           title &
+           getMessageStr(msg, arg)
 
 proc liMessage(info: TLineInfo, msg: TMsgKind, arg: string,
                eh: TErrorHandling) =
   var
-    frmt: string
+    title: string
     ignoreMsg = false
     color: ForegroundColor
   case msg
   of errMin..errMax:
     writeContext(info)
-    frmt = PosErrorFormat
+    title = ErrorTitle
+    color = ErrorColor
     # we try to filter error messages so that not two error message
     # in the same file and line are produced:
     #ignoreMsg = lastError == info and eh != doAbort
     lastError = info
-    color = fgRed
   of warnMin..warnMax:
     ignoreMsg = optWarns notin gOptions or msg notin gNotes
     if not ignoreMsg: writeContext(info)
-    frmt = PosWarningFormat
+    title = WarningTitle
+    color = WarningColor
     inc(gWarnCounter)
-    color = fgYellow
   of hintMin..hintMax:
     ignoreMsg = optHints notin gOptions or msg notin gNotes
-    frmt = PosHintFormat
+    title = HintTitle
+    color = HintColor
     inc(gHintCounter)
-    color = fgGreen
   # NOTE: currently line info line numbers start with 1,
   # but column numbers start with 0, however most editors expect
   # first column to be 1, so we need to +1 here
-  let x = frmt % [toMsgFilename(info), coordToStr(info.line),
-                  coordToStr(info.col+1)]
+  let x = PosFormat % [toMsgFilename(info), coordToStr(info.line),
+                       coordToStr(info.col+1)]
   let s = getMessageStr(msg, arg)
   if not ignoreMsg and not ignoreMsgBecauseOfIdeTools(msg):
-    msgWriteln(s, color, x)
+    styledMsgWriteln(styleBright, x, resetStyle, color, title, resetStyle, s)
     if optPrintSurroundingSrc and msg in errMin..errMax:
       info.writeSurroundingSrc
   handleError(msg, eh, s)