1 files changed, 60 insertions, 0 deletions
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 000000000..2ba31a16c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,60 @@
+extern crate libc;
+use libc::c_char;
+use libc::c_int;
+use std::ffi::CStr;
+use std::ffi::CString;
+
+#[link(name = "deno", kind = "static")]
+extern "C" {
+    fn deno_v8_version() -> *const c_char;
+    fn deno_init();
+    fn deno_set_flags(argc: *mut c_int, argv: *mut *mut c_char);
+}
+
+// Pass the command line arguments to v8.
+// Returns a vector of command line arguments that v8 did not understand.
+fn set_flags() -> Vec<String> {
+    // deno_set_flags(int* argc, char** argv) mutates argc and argv to remove
+    // flags that v8 understands.
+    // Convert command line arguments to a vector of C strings.
+    let mut argv = std::env::args()
+        .map(|arg| CString::new(arg).unwrap().into_bytes_with_nul())
+        .collect::<Vec<_>>();
+    // Make a new array, that can be modified by V8::SetFlagsFromCommandLine(),
+    // containing mutable raw pointers to the individual command line args.
+    let mut c_argv = argv.iter_mut()
+        .map(|arg| arg.as_mut_ptr() as *mut i8)
+        .collect::<Vec<_>>();
+    // Store the length of the argv array in a local variable. We'll pass a
+    // pointer to this local variable to deno_set_flags(), which then
+    // updates its value.
+    let mut c_argc = argv.len() as c_int;
+    // Let v8 parse the arguments it recognizes and remove them from c_argv.
+    unsafe {
+        deno_set_flags(&mut c_argc, c_argv.as_mut_ptr());
+    };
+    // If c_argc was updated we have to change the length of c_argv to match.
+    c_argv.truncate(c_argc as usize);
+    // Copy the modified arguments list into a proper rust vec and return it.
+    c_argv
+        .iter()
+        .map(|ptr| unsafe {
+            let cstr = CStr::from_ptr(*ptr as *const i8);
+            let slice = cstr.to_str().unwrap();
+            slice.to_string()
+        })
+        .collect::<Vec<_>>()
+}
+
+fn main() {
+    println!("Hi");
+    let args = set_flags();
+    unsafe { deno_init() };
+    let v = unsafe { deno_v8_version() };
+    let c_str = unsafe { CStr::from_ptr(v) };
+    let version = c_str.to_str().unwrap();
+    println!("version: {}", version);
+    for arg in args {
+        println!("arg: {}", arg);
+    }
+}