.json instead of toml

Cargo.lock

@@ -56,6 +56,12 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
 [[package]]
 name = "libc"
 version = "0.2.185"
@@ -74,6 +80,8 @@ version = "0.1.0"
 dependencies = [
  "pest",
  "pest_derive",
+ "serde",
+ "serde_json",
 ]
 
 [[package]]
@@ -137,6 +145,49 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.149"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
+dependencies = [
+ "itoa",
+ "memchr",
+ "serde",
+ "serde_core",
+ "zmij",
+]
+
 [[package]]
 name = "sha2"
 version = "0.10.9"
@@ -182,3 +233,9 @@ name = "version_check"
 version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"

Cargo.toml

@@ -6,3 +6,5 @@ edition = "2024"
 [dependencies]
 pest = "2.8.6"
 pest_derive = "2.8.6"
+serde = { version = "1.0.228", features = ["serde_derive"] }
+serde_json = "1.0.149"

src/compiler.rs

@@ -2,12 +2,20 @@ use std::{fs, path::PathBuf, process, time::Instant};
 
 use crate::{gogen, parser};
 
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+struct Config {
+    entry: String,
+    out_dir: String,
+}
+
 pub fn build() {
     let start = Instant::now();
 
     // 1. find project root
     let root = find_project_root().unwrap_or_else(|| {
-        panic!("error: could not find project root (mist.toml)");
+        panic!("error: could not find project root (mist.json)");
     });
 
     println!("mistc build ({})", root.display());
@@ -69,7 +77,7 @@ pub fn find_project_root() -> Option<PathBuf> {
     let mut dir = std::env::current_dir().ok()?;
 
     loop {
-        if dir.join("mist.toml").exists() {
+        if dir.join("mist.json").exists() {
             return Some(dir);
         }
 
@@ -79,26 +87,9 @@ pub fn find_project_root() -> Option<PathBuf> {
     }
 }
 
-struct Config {
-    entry: String,
-    out_dir: String,
-}
-
 fn load_config(root: &std::path::Path) -> Config {
     let content =
-        std::fs::read_to_string(root.join("mist.toml")).expect("failed to read mist.toml");
+        std::fs::read_to_string(root.join("mist.json")).expect("failed to read mist.json");
 
-    // super minimal parsing (replace later with toml crate)
-    let entry = extract(&content, "entry").unwrap_or("src/main.ms".into());
-    let out_dir = extract(&content, "out_dir").unwrap_or("build".into());
-
-    Config { entry, out_dir }
-}
-
-fn extract(content: &str, key: &str) -> Option<String> {
-    content
-        .lines()
-        .find(|l| l.trim().starts_with(key))
-        .and_then(|l| l.split('=').nth(1))
-        .map(|v| v.trim().trim_matches('"').to_string())
+    serde_json::from_str(&content).expect("invalid mist.json format")
 }

test/mist.json

@@ -0,0 +1,4 @@
+{
+    "entry": "src/main.ms",
+    "out_dir": "build"
+}

test/mist.toml

@@ -1,7 +0,0 @@
-[package]
-name = "myapp"
-version = "0.1.0"
-
-[build]
-entry = "src/main.ms"
-out_dir = "build"