refactor: ✨ (#418)

* refactor: ✨ move in one commit

Eveything in modules should probably be changed to `exported` defs.
The idea is to move everything first to keep proper history.

* refactor: 📝 add modules readme (wip)

* refactor: ✨ small move

* refactor: 📝 changed nestring, updated modules readme

* refactor: 📝 to document or not to document

* fix: 🐛 themes

replaced the template to use `main` and regenerated them
from lemnos themes.

* Revert "fix: 🐛 themes"

This reverts commit 4918d3633c8d2d81950a0ed0cfd9eb84241bc886.

* refactor: ✨ introduce sourced

- Created a source `root` in which sourcable demos are stored.
  Some might get converted to modules later on.
- Moved some files to bin too.

* fix: 🐛 fehbg.nu

* fix: 🐛 modules/after.nu

* moved some other stuff around

---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

sourced/fun/spark.nu

@@ -0,0 +1,54 @@
+let TICKS = [(char -u "2581")
+              (char -u "2582")
+              (char -u "2583")
+              (char -u "2584")
+              (char -u "2585")
+              (char -u "2586")
+              (char -u "2587")
+              (char -u "2588")]
+
+# send an array into spark and get a sparkline out
+# let v = [2, 250, 670, 890, 2, 430, 11, 908, 123, 57]
+# > spark $v
+# ▁▂▆▇▁▄▁█▁▁
+
+# create a small sparkline graph
+def spark [v: list] {
+    let min = ($v | math min)
+    let max = ($v | math max)
+    let ratio = (if $max == $min { 1.0 } else { 7.0 / ($max - $min)})
+    $v | each { |e|
+        let i = ((($e - $min) * $ratio) | math round)
+        $"($TICKS | get $i)"
+    } | str join
+}
+
+def assert_eq [num: int, expected: string, input: list] {
+    let actual = (spark2 $input)
+    let span = (metadata $expected).span;
+    if $actual != $expected {
+      error make {
+        msg: "Actual != Expected",
+        label: {
+            text: $"expected ($expected) but got ($actual)", start: $span.start, end: $span.end
+        }
+      }
+    } else {
+        print $"Test ($num) (ansi green)passed(ansi reset) ✓"
+    }
+}
+
+def spark2_tests [] {
+    assert_eq 1 "▁" [1.0]
+    assert_eq 2 "▁▁" [1.0, 1.0]
+    assert_eq 3 "▁▁▁▁" [1.0, 1.0, 1.0, 1.0]
+    assert_eq 4 "▁▅▄▇▄█" [1.0, 1.3, 1.2, 1.4, 1.2, 1.5]
+    assert_eq 5 "▁█▅" [-1.0, 1.0, 0.0]
+    assert_eq 6 "▁▂█▅▂" [1.0, 5.0, 22.0, 13.0, 5.0]
+    assert_eq 7 "▁▂▄▅▃█" [0.0, 30.0, 55.0, 80.0, 33.0, 150.0]
+    assert_eq 8 "▁▁▁▁▃▁▁▁▂█" [1.0, 2.0, 3.0, 4.0, 100.0, 5.0, 10.0, 20.0, 50.0, 300.0]
+    assert_eq 9 "▁▄█" [1.0, 50.0, 100.0]
+    assert_eq 10 "▁▄█" [0.1, 5.0, 10.0]
+    assert_eq 11 "▁▃█" [2.0, 4.0, 8.0]
+    # assert_eq 12 "▁█" [2.0, 4.0, 8.0]
+}