Added Dormant state, auto-create task dirs.

The Dormant state is for tasks that are still outstanding but not of
immediate importance. The main different between Dormant and Todo is
that dormant tasks are not listed by default. You must
`pit list dormant` to see them.

src/pitpkg/private/libpit.nim

@@ -15,6 +15,7 @@ type
     Pending = "pending",
     Done = "done",
     Todo = "todo"
+    Dormant = "dormant"
 
   IssueFilter* = ref object
     properties*: TableRef[string, string]
@@ -27,8 +28,9 @@ let ISSUE_FILE_PATTERN = re"[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f
 proc displayName*(s: IssueState): string =
   case s
   of Current: result = "Current"
-  of Pending: result = "Pending"
   of Done: result = "Done"
+  of Dormant: result = "Dormant"
+  of Pending: result = "Pending"
   of Todo: result = "Todo"
   of TodoToday: result = "Todo"
 
@@ -161,9 +163,10 @@ proc loadIssues*(path: string): seq[Issue] =
       result.add(loadIssue(path))
 
 proc changeState*(issue: Issue, tasksDir: string, newState: IssueState) =
-  removeFile(issue.filepath)
+  let oldFilepath = issue.filepath
   if newState == Done: issue.setDateTime("completed", getTime().local)
   tasksDir.store(issue, newState)
+  removeFile(oldFilepath)
 
 proc delete*(issue: Issue) = removeFile(issue.filepath)