Add visualize script

README.md

@@ -34,6 +34,12 @@ let
 in {}
 ```
 
+You can also use the `visualize.nu` script to visualize any theme in the terminal:
+
+```nu
+./visualize.nu themes/chalk.nix
+```
+
 <details>
 <summary>All themes</summary>
 

generate-themes.nu

@@ -2,7 +2,7 @@
 
 def theme-to-nix [
   theme: record, # The theme to convert to Nix.
-] {
+] -> nothing {
   $theme
   | items { |key, value|
     let key = match $key {

visualize.nu

@@ -0,0 +1,33 @@
+#!/usr/bin/env nu
+
+# Visualizes a theme in the terminal.
+def main [
+  theme: string, # The path to the theme to visualize.
+] -> nothing {
+  if not ($env.COLORTERM | str contains "truecolor") {
+    echo "your terminal emulator doesn't support truecolor, colors may be wrong\n"
+  }
+
+  let theme = open $theme
+  | str replace --all ";" ","
+  | str replace --all "=" ":"
+  | from json
+
+  $theme
+  | reject name author
+  | transpose name value
+  | each { |it|
+    let hex = ("0x" + $in.value) | into int
+
+    let r = $hex bit-shr 16
+    let g = $hex bit-shr 8 bit-and 0xFF
+    let b = $hex bit-and 0xFF
+
+    $it | merge { value: $"\\033[48;2;($r);($g);($b)m" }
+  }
+  | each { |it|
+    ^echo -e $"($it.name): ($it.value)          \\033[0m"
+  }
+
+  $"\n($theme.name) by ($theme.author)"
+}