fix: preserve column ordering

Cargo.toml

@@ -13,6 +13,7 @@ markdown-table-formatter = "0.3.0"
 serde = { version = "1.0.214", features = ["derive"] }
 serde_json = "1.0.132"
 serde_yml = "0.0.12"
+indexmap = { version = "2.6.0", features = ["serde"] }
 
 [dev-dependencies]
 assert_cmd = "2.0.16"

src/main.rs

@@ -141,4 +141,22 @@ tools:
 "##;
         generate_toolbox(&input.to_string());
     }
+
+    #[test]
+    fn should_not_sort_columns_alphabetically() {
+        let input = "
+tools:
+  z:
+    - neovim
+  a:
+    - javascript";
+        let markdown = generate_toolbox(&input.to_string());
+        assert_eq!(
+            markdown,
+            r#"| z                                                                                                                  | a                                                                                                                              |
+| ------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------ |
+| [<img align="left" alt="Neovim" src="https://img.shields.io/badge/-Neovim-57A143?logoColor=white&logo=neovim">](#) | [<img align="left" alt="JavaScript" src="https://img.shields.io/badge/-JavaScript-F7DF1E?logoColor=black&logo=javascript">](#) |
+"#
+        );
+    }
 }

src/schema.rs

@@ -1,12 +1,12 @@
+use indexmap::IndexMap;
 use serde::Deserialize;
-use std::collections::BTreeMap;
 
 #[derive(Deserialize, Debug, PartialEq)]
 pub struct Config {
     pub tools: Tools,
 }
 
-pub type Tools = BTreeMap<String, Vec<ToolEnum>>;
+pub type Tools = IndexMap<String, Vec<ToolEnum>>;
 
 #[derive(Deserialize, Debug, PartialEq)]
 #[serde(untagged)]