feature/add impl (#6)

* format code

* with object gen and args

* add implementation

* add rust generator

* reset generated code

* add basic output

* reset output

* add object

* add format function

* with opts

* fix vec

* add context to unwrap

* fix arguments

* with function body

* first complete generation: Still missing Vec<Obj>

* run full alpine

* add roadmap item

crates/dagger-codegen/src/rust/templates/object_tmpl.rs

@@ -0,0 +1,112 @@
+use dagger_core::introspection::{FullType, FullTypeFields, FullTypeFieldsArgs};
+use genco::prelude::rust;
+use genco::quote;
+
+use crate::functions::{type_ref_is_optional, CommonFunctions};
+use crate::rust::functions::{
+    field_options_struct_name, format_function, format_name, format_struct_name,
+};
+use crate::utility::OptionExt;
+
+pub fn render_object(funcs: &CommonFunctions, t: &FullType) -> eyre::Result<rust::Tokens> {
+    let selection = rust::import("crate::querybuilder", "Selection");
+    let child = rust::import("std::process", "Child");
+    let conn = rust::import("dagger_core::connect_params", "ConnectParams");
+    let arc = rust::import("std::sync", "Arc");
+
+    Ok(quote! {
+        pub struct $(t.name.pipe(|s| format_name(s))) {
+            pub proc: $arc<$child>,
+            pub selection: $selection,
+            pub conn: $conn,
+        }
+
+        $(t.fields.pipe(|f| render_optional_args(funcs, f)))
+
+        impl $(t.name.pipe(|s| format_name(s))) {
+            $(t.fields.pipe(|f| render_functions(funcs, f)))
+        }
+    })
+}
+
+fn render_optional_args(
+    funcs: &CommonFunctions,
+    fields: &Vec<FullTypeFields>,
+) -> Option<rust::Tokens> {
+    let rendered_fields = fields
+        .iter()
+        .map(|f| render_optional_arg(funcs, f))
+        .flatten()
+        .collect::<Vec<_>>();
+
+    if rendered_fields.len() == 0 {
+        None
+    } else {
+        Some(quote! {
+            $(for field in rendered_fields join ($['\r']) => $field)
+        })
+    }
+}
+
+fn render_optional_arg(funcs: &CommonFunctions, field: &FullTypeFields) -> Option<rust::Tokens> {
+    let output_type = field_options_struct_name(field);
+    let fields = field
+        .args
+        .pipe(|t| t.into_iter().flatten().collect::<Vec<_>>())
+        .map(|t| {
+            t.into_iter()
+                .filter(|t| type_ref_is_optional(&t.input_value.type_))
+                .collect::<Vec<_>>()
+        })
+        .pipe(|t| render_optional_field_args(funcs, t))
+        .flatten();
+
+    if let Some(fields) = fields {
+        Some(quote! {
+            pub struct $output_type {
+                $fields
+            }
+        })
+    } else {
+        None
+    }
+}
+
+fn render_optional_field_args(
+    funcs: &CommonFunctions,
+    args: &Vec<&FullTypeFieldsArgs>,
+) -> Option<rust::Tokens> {
+    if args.len() == 0 {
+        return None;
+    }
+    let rendered_args = args.into_iter().map(|a| &a.input_value).map(|a| {
+        quote! {
+            pub $(format_struct_name(&a.name)): Option<$(funcs.format_output_type(&a.type_))>,
+        }
+    });
+
+    Some(quote! {
+        $(for arg in rendered_args join ($['\r']) => $arg)
+    })
+}
+
+fn render_functions(funcs: &CommonFunctions, fields: &Vec<FullTypeFields>) -> Option<rust::Tokens> {
+    let rendered_functions = fields
+        .iter()
+        .map(|f| render_function(funcs, f))
+        .collect::<Vec<_>>();
+
+    if rendered_functions.len() > 0 {
+        Some(quote! {
+            $(for func in rendered_functions join ($['\r']) => $func)
+        })
+    } else {
+        None
+    }
+}
+
+fn render_function(funcs: &CommonFunctions, field: &FullTypeFields) -> Option<rust::Tokens> {
+    Some(quote! {
+        $(format_function(funcs, field))
+    })
+}