Add support specifying the map type to use (#708)

README.md

@@ -56,6 +56,22 @@ applied. Non-required properties with types that already have a default value
 (such as a `Vec<T>`) simply get the `#[serde(default)]` attribute (so you won't
 see e.g. `Option<Vec<T>>`).
 
+#### Alternate Map types
+
+By default, Typify uses `std::collections::HashMap` as described above.
+
+If you prefer to use `std::collections::BTreeMap` or a map type from a crate such
+as `indexmap::IndexMap`, you can specify this by calling `with_map_type` on the
+`TypeSpaceSettings` object, and providing the full path to the type you want to
+use. E.g. `::std::collections::BTreeMap` or `::indexmap::IndexMap`.
+
+Note that for a custom map type to work you must have `T` defined to generate
+a struct as described in [Objects](#objects). If `T` is not defined, typify
+will generate code using a `serde_json::Map<String, serde_json::Value>` instead.
+
+See the documentation for `TypeSpaceSettings::with_map_type` for the
+requirements for a map type.
+
 ### OneOf
 
 The `oneOf` construct maps to a Rust enum. Typify maps this to the various

cargo-typify/src/lib.rs

@@ -46,6 +46,10 @@ pub struct CliArgs {
     #[arg(long = "crate")]
     crates: Vec<CrateSpec>,
 
+    /// Specify the map like type to use.
+    #[arg(long = "map-type")]
+    map_type: Option<String>,
+
     /// Specify the policy unknown crates found in schemas with the
     /// x-rust-type extension.
     #[arg(
@@ -151,6 +155,10 @@ pub fn convert(args: &CliArgs) -> Result<String> {
         settings.with_crate(name, version.clone(), rename.as_ref());
     }
 
+    if let Some(map_type) = &args.map_type {
+        settings.with_map_type(map_type.clone());
+    }
+
     if let Some(unknown_crates) = &args.unknown_crates {
         let unknown_crates = match unknown_crates.as_str() {
             "generate" => UnknownPolicy::Generate,
@@ -192,6 +200,7 @@ mod tests {
             output: Some(PathBuf::from("-")),
             no_builder: false,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 
@@ -207,6 +216,7 @@ mod tests {
             output: Some(PathBuf::from("some_file.rs")),
             no_builder: false,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 
@@ -222,12 +232,32 @@ mod tests {
             output: None,
             no_builder: false,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 
         assert_eq!(args.output_path(), Some(PathBuf::from("input.rs")));
     }
 
+    #[test]
+    fn test_use_btree_map() {
+        let args = CliArgs {
+            input: PathBuf::from("input.json"),
+            builder: false,
+            additional_derives: vec![],
+            output: None,
+            no_builder: false,
+            crates: vec![],
+            map_type: Some("::std::collections::BTreeMap".to_string()),
+            unknown_crates: Default::default(),
+        };
+
+        assert_eq!(
+            args.map_type,
+            Some("::std::collections::BTreeMap".to_string())
+        );
+    }
+
     #[test]
     fn test_builder_as_default_style() {
         let args = CliArgs {
@@ -237,6 +267,7 @@ mod tests {
             output: None,
             no_builder: false,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 
@@ -252,6 +283,7 @@ mod tests {
             output: None,
             no_builder: true,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 
@@ -267,6 +299,7 @@ mod tests {
             output: None,
             no_builder: false,
             crates: vec![],
+            map_type: None,
             unknown_crates: Default::default(),
         };
 

cargo-typify/tests/integration.rs

@@ -158,3 +158,29 @@ fn test_help() {
     assert!(output.status.success());
     assert_contents("tests/outputs/help.txt", &actual);
 }
+
+#[test]
+fn test_btree_map() {
+    use assert_cmd::Command;
+
+    let input = concat!(env!("CARGO_MANIFEST_DIR"), "/../example.json");
+
+    let temp = TempDir::new("cargo-typify").unwrap();
+    let output_file = temp.path().join("output.rs");
+
+    let mut cmd = Command::cargo_bin("cargo-typify").unwrap();
+    cmd.args([
+        "typify",
+        input,
+        "--map-type",
+        "::std::collections::BTreeMap",
+        "--output",
+        output_file.to_str().unwrap(),
+    ])
+    .assert()
+    .success();
+
+    let actual = std::fs::read_to_string(output_file).unwrap();
+
+    assert_contents("tests/outputs/custom_btree_map.rs", &actual);
+}

cargo-typify/tests/outputs/builder.rs

@@ -35,19 +35,22 @@ pub mod error {
 #[doc = r""]
 #[doc = r" ```json"]
 #[doc = "{"]
-#[doc = "  \"type\": \"object\""]
+#[doc = "  \"type\": \"object\","]
+#[doc = "  \"additionalProperties\": {"]
+#[doc = "    \"type\": \"string\""]
+#[doc = "  }"]
 #[doc = "}"]
 #[doc = r" ```"]
 #[doc = r" </details>"]
 #[derive(:: serde :: Deserialize, :: serde :: Serialize, Clone, Debug)]
-pub struct Fruit(pub ::serde_json::Map<::std::string::String, ::serde_json::Value>);
+pub struct Fruit(pub ::std::collections::HashMap<::std::string::String, ::std::string::String>);
 impl ::std::ops::Deref for Fruit {
-    type Target = ::serde_json::Map<::std::string::String, ::serde_json::Value>;
-    fn deref(&self) -> &::serde_json::Map<::std::string::String, ::serde_json::Value> {
+    type Target = ::std::collections::HashMap<::std::string::String, ::std::string::String>;
+    fn deref(&self) -> &::std::collections::HashMap<::std::string::String, ::std::string::String> {
         &self.0
     }
 }
-impl From<Fruit> for ::serde_json::Map<::std::string::String, ::serde_json::Value> {
+impl From<Fruit> for ::std::collections::HashMap<::std::string::String, ::std::string::String> {
     fn from(value: Fruit) -> Self {
         value.0
     }
@@ -57,8 +60,10 @@ impl From<&Fruit> for Fruit {
         value.clone()
     }
 }
-impl From<::serde_json::Map<::std::string::String, ::serde_json::Value>> for Fruit {
-    fn from(value: ::serde_json::Map<::std::string::String, ::serde_json::Value>) -> Self {
+impl From<::std::collections::HashMap<::std::string::String, ::std::string::String>> for Fruit {
+    fn from(
+        value: ::std::collections::HashMap<::std::string::String, ::std::string::String>,
+    ) -> Self {
         Self(value)
     }
 }