Fix edge case when no marks exist yet.

Something depends on isaac 0.1.0, but that version doesn't compile on Nim 0.16
and above. Until the transitive dependancy is updated, ask for at least 0.1.2.

private/ptkutil.nim

@@ -0,0 +1,8 @@
+template first*(a: openarray): auto = a[0]
+
+template last*(a: openarray): auto = a[len(a)-1]
+
+proc flatten*[T](a: seq[seq[T]]): seq[T] =
+  result = @[]
+  for subseq in a:
+    result.add(subseq)

ptk.nim

@@ -6,7 +6,7 @@
 import algorithm, docopt, json, langutils, logging, os, nre, sequtils,
   sets, strutils, tempfile, terminal, times, timeutils, uuids
 
-import ptkutil
+import private/ptkutil
 
 type
   Mark* = tuple[id: UUID, time: TimeInfo, summary: string, notes: string, tags: seq[string]]
@@ -347,6 +347,7 @@ Usage:
   ptk continue
   ptk delete <id>
   ptk (list | ls) [options]
+  ptk (list | ls) tags
   ptk sum-time --ids <ids>...
   ptk sum-time [options] [<firstId>] [<lastId>]
   ptk (-V | --version)
@@ -379,7 +380,7 @@ Options:
   let now = getLocalTime(getTime())
 
   # Parse arguments
-  let args = docopt(doc, version = "ptk 0.8.0")
+  let args = docopt(doc, version = "ptk 0.10.0")
 
   if args["--echo-args"]: echo $args
 
@@ -513,7 +514,8 @@ Options:
       let prevLastIdx = timeline.marks.getLastIndex()
       timeline.marks.add(newMark)
       timeline.writeMarks(
-        indices = @[prevLastIdx, timeline.marks.len - 1],
+        indices = if prevLastIdx < 0: @[0]
+                  else: @[prevLastIdx, timeline.marks.len - 1],
         includeNotes = args["--verbose"])
 
       saveTimeline(timeline, timelineLocation)
@@ -525,7 +527,9 @@ Options:
       if args["<id>"]:
         markToResumeIdx = timeline.marks.findById($args["<id>"])
         if markToResumeIdx == -1: exitErr "Cannot find a mark matching " & $args["<id>"]
-      else: markToResumeIdx = timeline.marks.getLastIndex()
+      else:
+        markToResumeIdx = timeline.marks.getLastIndex()
+        if markToResumeIdx < 0: exitErr "No mark to resume."
       var markToResume = timeline.marks[markToResumeIdx]
       
       var newMark: Mark = (
@@ -552,7 +556,9 @@ Options:
       if args["<id>"]:
         markIdx = timeline.marks.findById($args["<id>"])
         if markIdx == -1: exitErr "Cannot find a mark matching " & $args["<id>"]
-      else: markIdx = timeline.marks.getLastIndex()
+      else:
+        markIdx = timeline.marks.getLastIndex()
+        if markIdx < 0: exitErr "No mark to amend."
 
       var mark = timeline.marks[markIdx]
       
@@ -590,11 +596,17 @@ Options:
 
     if args["list"] or args["ls"]:
 
-      var selectedIndices = timeline.filterMarkIndices(args)
+      if args["tags"]:
 
-      timeline.writeMarks(
+        echo $(timeline.marks.mapIt(it.tags)
-        indices = selectedIndices,
+                .flatten().deduplicate().sorted(system.cmp).join("\n"))
-        includeNotes = args["--version"])
+
+      else:
+        var selectedIndices = timeline.filterMarkIndices(args)
+
+        timeline.writeMarks(
+          indices = selectedIndices,
+          includeNotes = args["--version"])
 
     if args["sum-time"]:
     

ptk.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.8.0"
+version       = "0.10.0"
 author        = "Jonathan Bernard"
 description   = "Personal Time Keeper"
 license       = "MIT"
@@ -8,5 +8,5 @@ bin           = @["ptk"]
 
 # Dependencies
 
-requires @["nim >= 0.15.0", "docopt >= 0.6.4", "uuids", "langutils", "tempfile", "timeutils >= 0.2.0"]
+requires @["nim >= 0.15.0", "docopt >= 0.6.4", "uuids", "langutils", "tempfile", "timeutils >= 0.2.0", "isaac >= 0.1.2"]
 

ptkutil.nim

@@ -1,3 +0,0 @@
-template first*(a: openarray): auto = a[0]
-
-template last*(a: openarray): auto = a[len(a)-1]