feat(typst): extern rust functions for C ABI

1 files changed, 19 insertions, 4 deletions

diff --git a/typst/src/lib.rs b/typst/src/lib.rs
index 5d9dcc4..c561c19 100644
--- a/typst/src/lib.rs
+++ b/typst/src/lib.rs
@@ -1,4 +1,6 @@
 //! Based on https://github.com/zeon256/minimal-typst-svg-renderer
+use std::ffi::{CString, CStr};
+use std::os::raw::c_char;
 
 use typst::layout::PagedDocument;
 use typst_svg::svg_frame;
@@ -7,8 +9,7 @@ use crate::world::MinimalWorld;
 
 mod world;
 
-pub fn compile() {
-    let content = include_str!("../../template.typ");
+pub fn compile(content: &str) -> String {
     let world = MinimalWorld::new(content);
 
     let res = typst::compile::<PagedDocument>(&world);
@@ -19,6 +20,20 @@ pub fn compile() {
 
     let doc = res.output.expect("Error compiling typst");
 
-    let svg = svg_frame(&doc.pages[0].frame);
-    println!("{}", svg)
+    svg_frame(&doc.pages[0].frame)
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn typst_generateSVG(source: *const c_char) ->  *const c_char {
+    unsafe {
+        let res = compile(CStr::from_ptr(source).to_str().unwrap());
+        CString::new(res).unwrap().into_raw()
+    }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn typst_freeSVG(res: *mut c_char) {
+    unsafe {
+        drop(CString::from_raw(res));
+    }
 }