add the glint.map_command function

CHANGELOG.md

@@ -5,6 +5,8 @@
 
 # v1
 
+## [1.2.0](https://github.com/TanklesXL/glint/compare/v1.2.0...v1.1.1)
+
 ## [1.1.1](https://github.com/TanklesXL/glint/compare/v1.1.1...v1.1.0)
 
 - updated gleam stdlib to >= 0.43

gleam.toml

@@ -1,5 +1,5 @@
 name = "glint"
-version = "1.1.1"
+version = "1.2.0"
 
 # Fill out these fields if you intend to generate HTML documentation or publishname = "glint"
 # your project to the Hex package manager.

src/glint.gleam

@@ -315,6 +315,20 @@ pub fn command(do runner: Runner(a)) -> Command(a) {
   )
 }
 
+/// Map the output of a [`Command`](#Command)
+///
+/// This function can be useful when you are handling user-defined commands or commands from other packages and need to make sure the return type matches your own commands.
+///
+pub fn map_command(command: Command(a), with fun: fn(a) -> b) -> Command(b) {
+  Command(
+    do: fn(named_args, args, flags) { fun(command.do(named_args, args, flags)) },
+    description: command.description,
+    flags: command.flags,
+    named_args: command.named_args,
+    unnamed_args: command.unnamed_args,
+  )
+}
+
 /// Attach a helptext description to a [`Command(a)`](#Command)
 ///
 /// This function allows for user-supplied newlines in long text strings. Individual newline characters are instead converted to spaces.