Finished logging module.

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-#
-#
-#            Nimrod's Runtime Library
-#        (c) Copyright 2012 Andreas Rumpf
-#
-#    See the file "copying.txt", included in this
-#    distribution, for details about the copyright.
-#
-
-## This module implements a simple logger. It is based on the following design:
-## * Runtime log formating is a bug: Sooner or later every log file is parsed.
-## * Keep it simple: If this library does not fullfill your needs, write your 
-##   own. Trying to support every logging feature just leads to bloat.
-## 
-## Format is:: 
-##
-##   DEBUG|INFO|... (2009-11-02 00:00:00)? (Component: )? Message
-##
-## 
-
-import strutils, os, times
-
-type
-  TLevel* = enum  ## logging level
-    lvlAll,       ## all levels active
-    lvlDebug,     ## debug level (and any above) active
-    lvlInfo,      ## info level (and any above) active
-    lvlWarn,      ## warn level (and any above) active
-    lvlError,     ## error level (and any above) active
-    lvlFatal,     ## fatal level (and any above) active
-    lvlNone
-
-const
-  LevelNames*: array [TLevel, string] = [
-    "DEBUG", "DEBUG", "INFO", "WARN", "ERROR", "FATAL", "NONE"
-  ]
-
-  defaultFmtStr = "" ## default string between log level and message per logger
-  verboseFmtStr = "$date $time "
-
-type
-  TLogger* = object of TObject ## abstract logger; the base type of all loggers
-    levelThreshold*: TLevel    ## only messages of level >= levelThreshold 
-                               ## should be processed
-    fmtStr: string ## = defaultFmtStr by default, see substituteLog for $date etc.
-    
-  TConsoleLogger* = object of TLogger ## logger that writes the messages to the
-                                      ## console
-  
-  TFileLogger* = object of TLogger ## logger that writes the messages to a file
-    f: TFile
-  
-  # TODO: implement rolling log, will produce filename.1, filename.2 etc.
-  TRollingFileLogger* = object of TFileLogger ## logger that writes the 
-                                              ## message to a file
-    maxLines: int # maximum number of lines    
-    curLine : int
-    baseName: string # initial filename
-    logFiles: int # how many log files already created, e.g. basename.1, basename.2...
-    
-    
-
-
-proc substituteLog*(frmt: string): string = 
-  ## converts $date to the current date
-  ## converts $time to the current time
-  ## converts $app to getAppFilename()
-  ## converts 
-  result = newStringOfCap(frmt.len + 20)
-  var i = 0
-  while i < frmt.len: 
-    if frmt[i] != '$': 
-      result.add(frmt[i])
-      inc(i)
-    else:
-      inc(i)
-      var v = ""
-      var app = getAppFilename()
-      while frmt[i] in IdentChars: 
-        v.add(toLower(frmt[i]))
-        inc(i)
-      case v
-      of "date": result.add(getDateStr())
-      of "time": result.add(getClockStr())
-      of "app":  result.add(app)
-      of "appdir": result.add(app.splitFile.dir)
-      of "appname": result.add(app.splitFile.name)
-
-
-
-method log*(L: ref TLogger, level: TLevel,
-            frmt: string, args: varargs[string, `$`]) =
-  ## override this method in custom loggers. Default implementation does
-  ## nothing.
-  nil
-  
-method log*(L: ref TConsoleLogger, level: TLevel,
-            frmt: string, args: varargs[string, `$`]) = 
-    Writeln(stdout, LevelNames[level], " ", substituteLog(L.fmtStr), frmt % args)
-
-method log*(L: ref TFileLogger, level: TLevel, 
-            frmt: string, args: varargs[string, `$`]) = 
-    Writeln(L.f, LevelNames[level], " ", substituteLog(L.fmtStr), frmt % args)
-
-proc defaultFilename*(): string = 
-  ## returns the default filename for a logger
-  var (path, name, ext) = splitFile(getAppFilename())
-  result = changeFileExt(path / name & "_" & getDateStr(), "log")
-
-      
-
-
-proc newConsoleLogger*(levelThreshold = lvlAll) : ref TConsoleLogger =
-  new result
-  result.fmtStr = defaultFmtStr
-  result.levelThreshold = levelThreshold
-
-proc newFileLogger*(filename = defaultFilename(), 
-                    mode: TFileMode = fmAppend,
-                    levelThreshold = lvlAll): ref TFileLogger = 
-  new(result)
-  result.levelThreshold = levelThreshold
-  result.f = open(filename, mode)
-  result.fmtStr = defaultFmtStr
-
-# ------
-
-proc readLogLines(logger : ref TRollingFileLogger) = nil
-  #f.readLine # TODO read all lines, update curLine
-
-
-proc newRollingFileLogger*(filename = defaultFilename(), 
-                           mode: TFileMode = fmReadWrite,
-                           levelThreshold = lvlAll,
-                           maxLines = 1000): ref TRollingFileLogger = 
-  new(result)
-  result.levelThreshold = levelThreshold
-  result.fmtStr = defaultFmtStr
-  result.maxLines = maxLines
-  result.f = open(filename, mode)
-  result.curLine = 0
-  
-  # TODO count all number files
-  # count lines in existing filename file
-  # if >= maxLines then rename to next numbered file and create new file
-  
-  #if mode in {fmReadWrite, fmReadWriteExisting}:
-  #  readLogLines(result)
-
-
-
-method log*(L: ref TRollingFileLogger, level: TLevel, 
-            frmt: string, args: varargs[string, `$`]) = 
-  # TODO 
-  # if more than maxlines, then set cursor to zero
-  
-  Writeln(L.f, LevelNames[level], " ", frmt % args)
-
-# --------
-
-var
-  level* = lvlAll  ## global log filter
-  handlers*: seq[ref TLogger] = @[] ## handlers with their own log levels
-
-proc logLoop(level: TLevel, frmt: string, args: varargs[string, `$`]) =
-  for logger in items(handlers): 
-    if level >= logger.levelThreshold:
-      log(logger, level, frmt, args)
-
-template log*(level: TLevel, frmt: string, args: varargs[string, `$`]) =
-  ## logs a message of the given level
-  bind logLoop
-  bind `%`
-  bind logging.Level
-  
-  if level >= logging.Level:
-    logLoop(level, frmt, args)
-
-template debug*(frmt: string, args: varargs[string, `$`]) =
-  ## logs a debug message
-  log(lvlDebug, frmt, args)
-
-template info*(frmt: string, args: varargs[string, `$`]) = 
-  ## logs an info message
-  log(lvlInfo, frmt, args)
-
-template warn*(frmt: string, args: varargs[string, `$`]) = 
-  ## logs a warning message
-  log(lvlWarn, frmt, args)
-
-template error*(frmt: string, args: varargs[string, `$`]) = 
-  ## logs an error message
-  log(lvlError, frmt, args)
-  
-template fatal*(frmt: string, args: varargs[string, `$`]) =  
-  ## logs a fatal error message
-  log(lvlFatal, frmt, args)
-
-
-# --------------
-
-when isMainModule:
-  var L = newConsoleLogger()
-  var fL = newFileLogger("test.log")
-  fL.fmtStr = verboseFmtStr
-  handlers.add(L)
-  handlers.add(fL)
-  info("hello", [])
-  
-