Add asdf tool-versions definitions pinning this to Nim 1.6

The previous logic that was intended to find the first non-empty
filename that represented a valid file location was wrong. Replaced with
a simpler filter-based version.

Additionally, if the user provides a specific configuration filename, we
no longer fall back to the defaults if it is not found. Instead we just
err out and inform them that the file the specified was not found.

.tool-versions

@@ -0,0 +1 @@
+nim 1.6.20

private/version.nim

@@ -1 +1 @@
-const PTK_VERSION* = "1.0.13"
+const PTK_VERSION* = "1.0.14"

ptk.nim

@@ -307,28 +307,21 @@ Options:
     quit()
 
   # Find and parse the .ptkrc file
-  let ptkrcLocations = @[
-    if args["--config"]: $args["--config"] else:"",
-    ".ptkrc", $getEnv("PTKRC"), $getEnv("HOME") & "/.ptkrc"]
+  let ptkrcLocations =
+    if args["--config"]: @[$args["--config"]]
+    else: @[".ptkrc", $getEnv("PTKRC"), $getEnv("HOME") & "/.ptkrc"]
 
-  var ptkrcFilename: string =
-    foldl(ptkrcLocations, if len(a) > 0: a elif fileExists(b): b else: "")
+  let foundPtkrcLocations =
+    ptkrcLocations.filterIt(it.len > 0 and fileExists(it))
 
   var cfg: JsonNode
-  var cfgFile: File
-  if not fileExists(ptkrcFilename):
+  if foundPtkrcLocations.len < 1:
     warn "ptk: could not find .ptkrc file."
     debug "ptk: considered the following locations:\n\t" & ptkrcLocations.join("\n\t")
-    #ptkrcFilename = $getEnv("HOME") & "/.ptkrc"
-    #try:
-    #  cfgFile = open(ptkrcFilename, fmWrite)
-    #  cfgFile.write("{\"timelineLogFile\": \"timeline.log.json\"}")
-    #except: warn "ptk: could not write default .ptkrc to " & ptkrcFilename
-    #finally: close(cfgFile)
 
-  try: cfg = parseFile(ptkrcFilename)
+  try: cfg = parseFile(foundPtkrcLocations[0])
   except: raise newException(IOError,
-    "unable to read config file: " & ptkrcFilename &
+    "unable to read config file: " & foundPtkrcLocations[0] &
     "\x0D\x0A" & getCurrentExceptionMsg())
 
   # Find the time log file

ptk.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "1.0.13"
+version       = "1.0.14"
 author        = "Jonathan Bernard"
 description   = "Personal Time Keeper"
 license       = "MIT"