From 36b853ac0522667be1cef98ba317637e632fea4e Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@zed.dev>
Date: Sun, 13 Aug 2023 01:40:10 -0600
Subject: [PATCH] WIP

---
 crates/gpui/playground_macros/Cargo.toml      | 14 ++++++++
 .../src/playground_macros.rs                  | 36 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 crates/gpui/playground_macros/Cargo.toml
 create mode 100644 crates/gpui/playground_macros/src/playground_macros.rs

diff --git a/crates/gpui/playground_macros/Cargo.toml b/crates/gpui/playground_macros/Cargo.toml
new file mode 100644
index 0000000000..a1f84eb5e0
--- /dev/null
+++ b/crates/gpui/playground_macros/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "playground_macros"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+path = "src/playground_macros.rs"
+proc-macro = true
+
+[dependencies]
+syn = "1.0.72"
+quote = "1.0.9"
+proc-macro2 = "1.0.66"
+once_cell = "1.18.0"
diff --git a/crates/gpui/playground_macros/src/playground_macros.rs b/crates/gpui/playground_macros/src/playground_macros.rs
new file mode 100644
index 0000000000..5e8a10a59c
--- /dev/null
+++ b/crates/gpui/playground_macros/src/playground_macros.rs
@@ -0,0 +1,36 @@
+use proc_macro::TokenStream;
+use quote::{format_ident, quote};
+use syn::{parse_macro_input, FnArg, ItemFn, PatType};
+
+#[proc_macro_attribute]
+pub fn tailwind_lengths(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    let input_function = parse_macro_input!(item as ItemFn);
+    let function_signature = input_function.sig.clone();
+    let function_body = input_function.block;
+
+    let argument_name = match function_signature.inputs.iter().nth(1) {
+        Some(FnArg::Typed(PatType { pat, .. })) => pat,
+        _ => panic!("Couldn't find the second argument in the function signature"),
+    };
+
+    let scale_lengths = [
+        ("0", quote! { Length::Rems(0.) }),
+        ("px", quote! { Length::Pixels(1.) }),
+        // ...
+        ("auto", quote! { Length::Auto }),
+    ];
+
+    let mut output_functions = proc_macro2::TokenStream::new();
+
+    for (length, value) in &scale_lengths {
+        let function_name = format_ident!("{}_{}", function_signature.ident, length);
+        output_functions.extend(quote! {
+            pub fn #function_name(mut self) -> Self {
+                let #argument_name = #value;
+                #function_body
+            }
+        });
+    }
+
+    output_functions.into()
+}