Fix macOS shared memory filename length limit (fixes issue #92) (#93)

* Fix macOS shared memory filename length limit

Shorten shared memory object names from "__tdf_kittage_{pid}_page_{rn}_{page_num}"
to "tdf_{pid}_{rn}_{page_num}" and change timestamp from nanoseconds to
milliseconds % 1M to stay under macOS's 31-character limit for shm names.

Fixes "File name too long (os error 63)" error when rendering PDFs on macOS.

On macOS, SHM_NAME_MAX: 30

* Fix macOS shared memory filename length limit

Shorten shared memory object names from "__tdf_kittage_{pid}_page_{rn}_{page_num}"
to "tdf_{pid}_{rn}_{page_num}" and change timestamp from nanoseconds to
milliseconds % 1M to stay under macOS's 31-character limit for shm names.

Fixes "File name too long (os error 63)" error when rendering PDFs on macOS.

SHM_NAME_MAX: 30

src/converter.rs

@@ -139,14 +139,13 @@ pub async fn run_conversion_loop(
 				let rn = SystemTime::now()
 					.duration_since(UNIX_EPOCH)
 					.unwrap_or_default()
-					.as_nanos();
+					.as_millis() % 1_000_000;
 
 				let mut img = if shms_work {
-					kittage::image::Image::shm_from(
-						dyn_img,
-						&format!("__tdf_kittage_{pid}_page_{rn}_{page_num}")
-					)
-					.map_err(|e| RenderError::Converting(format!("Couldn't write to shm: {e}")))?
+					kittage::image::Image::shm_from(dyn_img, &format!("tdf_{pid}_{rn}_{page_num}"))
+						.map_err(|e| {
+							RenderError::Converting(format!("Couldn't write to shm: {e}"))
+						})?
 				} else {
 					kittage::image::Image::from(dyn_img)
 				};

src/kitty.rs

@@ -78,8 +78,7 @@ pub async fn run_action<'image, 'data, 'es>(
 pub async fn do_shms_work(ev_stream: &mut EventStream) -> bool {
 	let img = DynamicImage::new_rgb8(1, 1);
 	let pid = std::process::id();
-	let Ok(mut k_img) = kittage::image::Image::shm_from(img, &format!("__tdf_kittage_test_{pid}"))
-	else {
+	let Ok(mut k_img) = kittage::image::Image::shm_from(img, &format!("tdf_test_{pid}")) else {
 		return false;
 	};