Add Nim demo

demos/nim/.vscode/launch.json

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+{
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "lldb",
+			"request": "launch",
+			"name": "Run your Executable",
+			"program": "${workspaceFolder}/main",
+			"args": [],
+			"cwd": "${workspaceFolder}",
+			"initCommands": [
+				// To let LLDB know that NCSTRING is just like a C string
+				"type format add --format c-string NCSTRING"
+			],
+			"preLaunchTask": "build"
+		}
+	]
+}

demos/nim/.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"label": "build",
+			"type": "shell",
+			"command": "nim c main.nim"
+		}
+	]
+}

demos/nim/main.nim

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+import random, json, options, sugar
+
+type
+  Kind = object
+    array: bool
+  
+  Label = object
+    label: Option[string]
+  
+  Column = object
+    content: Option[string]
+    tag: Option[string]
+    color: Option[string]
+  
+  Row = object
+    label: Option[string]
+    columns: seq[Column]
+  
+  Marker = object
+    id: string
+    row: int
+    column: int
+    rows: Option[int]
+    columns: Option[int]
+    label: Option[string]
+    color: Option[string]
+  
+  Grid = object
+    kind: Kind
+    columnLabels: Option[seq[Label]]
+    rows: seq[Row]
+    markers: Option[seq[Marker]]
+
+proc showSeq[T](data: seq[T], markers: seq[(string, int)] = @[]): cstring = 
+  # Need to use cstring string type for C-compatible strings
+  let labels = collect(newSeq):
+    # Labels are indexes of the seq
+    for x in 0 ..< data.len():
+      Label(label: some($x))
+  
+  let columns = collect(newSeq):
+    # Columns contain values of the seq
+    for x in data:
+      Column(content: some($x), tag: some($x))
+  
+  let marks = collect(newSeq):
+    # If there are any markers (id - string, index - int)
+    for marker in markers:
+      Marker(id: marker[0], row: 0, column: marker[1])
+
+  let grid = Grid(
+    kind: Kind(array: true),
+    rows: @[Row(columns: columns)],
+    columnLabels: some(labels),
+    markers: some(marks)
+  )
+  # Serialize to JSON
+  result = $ %grid
+
+proc main = 
+  # Random seed
+  randomize()
+
+  # Fill seq with 10 random values from 1 to 999
+  var a = newSeq[int]()
+  for x in 0..10:
+    a.add rand(1..999)
+  
+  # Simple bubble sort with some markers
+  # Open the visualizer and type in "ress"
+  let n = a.len() - 1
+  var ress = showSeq(a, @[("i", 0), ("j", 0)])
+  for i in 0 .. n:
+    for j in 0 .. n - i - 1:
+      if a[j] > a[j+1]:
+        ress = showSeq(a, @[("i", i), ("j", j)]) # breakpoint
+        let temp = a[j]
+        a[j] = a[j + 1]
+        a[j + 1] = temp
+        ress = showSeq(a, @[("i", i), ("j", j)]) # breakpoint
+
+main()

demos/nim/nim.cfg

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+# For Nim source code lines
+debugger:native