feat: add a build script to forc-client to keep proxy abi in sync wit…

…h file (#6535)

forc-plugins/forc-client/Cargo.toml

@@ -49,6 +49,9 @@ rexpect = "0.5"
 tempfile = "3"
 toml_edit = "0.21.1"
 
+[build-dependencies]
+regex = "1.5.4"
+
 [[bin]]
 name = "forc-deploy"
 path = "src/bin/deploy.rs"

forc-plugins/forc-client/build.rs

@@ -0,0 +1,69 @@
+use std::fs;
+use std::path::PathBuf;
+
+fn minify_json(json: &str) -> String {
+    let mut result = String::with_capacity(json.len());
+    let mut in_string = false;
+    let mut previous_char: Option<char> = None;
+
+    for c in json.chars() {
+        if in_string {
+            result.push(c);
+            if c == '"' && previous_char != Some('\\') {
+                in_string = false;
+            }
+        } else {
+            match c {
+                '"' => {
+                    result.push(c);
+                    in_string = true;
+                }
+                ' ' | '\n' | '\r' | '\t' => continue, // Skip whitespace
+                _ => result.push(c),
+            }
+        }
+        previous_char = Some(c);
+    }
+    result
+}
+
+fn main() {
+    // Path to the JSON file in the root directory next to the `src` folder
+    let json_path = PathBuf::from("proxy_abi/proxy_contract-abi.json");
+    // If proxy_contract-abi.json is changed, re-run this script
+    println!("cargo:rerun-if-changed=proxy_abi/proxy_contract-abi.json");
+    // Path to the Rust source file that contains the `abigen!` macro that
+    // creates a `ProxyContract`.
+    let source_file_path = PathBuf::from("src/util/tx.rs");
+    // Read the contents of the JSON file
+    let json_content =
+        fs::read_to_string(json_path).expect("Unable to read proxy_contract-abi.json");
+
+    // Minify the JSON content
+    let minified_json = minify_json(&json_content);
+
+    // Read the contents of the source file
+    let mut source_code =
+        fs::read_to_string(&source_file_path).expect("Unable to read source file");
+
+    // Prepare the replacement string for the `abigen!` macro
+    let escaped_json = minified_json.replace('\\', "\\\\").replace('"', "\\\"");
+    let new_abigen = format!(
+        "abigen!(Contract(name = \"ProxyContract\", abi = \"{}\",));",
+        escaped_json
+    );
+
+    // Use a regular expression to find and replace the `abigen!` macro
+    let re = regex::Regex::new(r#"abigen!\(Contract\(name = "ProxyContract", abi = ".*?",\)\);"#)
+        .expect("Invalid regex pattern");
+
+    // Replace the existing `abigen!` macro with the new one containing the updated ABI
+    if re.is_match(&source_code) {
+        source_code = re.replace(&source_code, new_abigen.as_str()).to_string();
+    } else {
+        panic!("abigen! macro not found in the source file");
+    }
+
+    // Write the modified source code back to the source file
+    fs::write(source_file_path, source_code).expect("Unable to write back to the source file");
+}