A few small things I noticed while working on remglk-rs

docs/glkapi-differences-c-api.md

@@ -0,0 +1,57 @@
+Differences between GlkApi and the C Glk API
+============================================
+
+There are a few differences between GlkApi and the [C Glk API](https://eblong.com/zarf/glk/Glk-Spec-075.html). The GlkApi versions are here described as Typescript functions.
+
+Array parameters
+----------------
+
+When a function needs an array the C API takes a pointer and a length. One example is `glk_request_line_event`.
+
+```c
+void glk_request_line_event(winid_t win, char *buf, glui32 maxlen, glui32 initlen);
+```
+
+GlkApi instead takes only one parameter, which is an array of maxlen length. This can be a typed array, or a normal array.
+
+```ts
+type GlkByteArray = Array<number> | Uint8Array
+glk_request_line_event(win: GlkWindow, buf: GlkByteArray, initlen?: number): void
+```
+
+String functions
+----------------
+
+String functions like `glk_put_string` go one step further, and need the string array to be pre-converted to a JS string.
+
+```c
+void glk_put_string(char *s);
+```
+
+```ts
+glk_put_string(val: string): void
+```
+
+Structs and out parameters
+--------------------------
+
+The C API naturally support structs, as well as out parameters:
+
+```c
+void glk_current_time(glktimeval_t *time);
+void glk_window_get_size(winid_t win, glui32 *widthptr, glui32 *heightptr);
+```
+
+The GlkApi versions take either a `RefStruct` or a `RefBox`. You can read the fields of a `RefStruct` with `get_field(index: number)`, and the value of a `RefBox` with `get_value()`.
+
+```ts
+glk_current_time(struct: RefStruct): void
+glk_window_get_size(win: GlkWindow, width?: RefBox, height?: RefBox): void,
+```
+
+`glk_fileref_create_by_prompt`
+----------------------------
+
+The C API version of `glk_fileref_create_by_prompt` is synchronous: you call it, and (from the perspective of your code) immediately get back the response.
+
+The GlkApi version is asynchronous: control will be passed to GlkOte, and once the file reference has been created `VM.resume` will be called again, with the fref as the first (and only) argument. If the VM uses GiDispa then the fref is also returned through it. The `VM.resume` function must be written such that it can handle being called after either `glk_fileref_create_by_prompt` or `glk_select`.

src/glkapi/glkapi.ts

@@ -354,14 +354,14 @@ export class AsyncGlk implements Interface.GlkApi {
         if (!win) {
             throw new Error('Invalid Window')
         }
-        if (win.input.type !== 'line' || (win.type !== 'buffer' && win.type !== 'grid')) {
+        if (win.input.type !== 'line') {
             if (ev) {
                 set_event(ev)
             }
             return
         }
 
-        this.handle_line_input(win, this.partial_inputs?.[win.disprock] ?? '', ev)
+        this.handle_line_input(win as TextWindow, this.partial_inputs?.[win.disprock] ?? '', ev)
     }
 
     glk_cancel_mouse_event(win: Window) {
@@ -1071,7 +1071,7 @@ export class AsyncGlk implements Interface.GlkApi {
             stylevalue = (1 + value * 0.1) + 'em'
         }
         if (hint === stylehint_Weight) {
-            stylevalue = weights[value]
+            stylevalue = weights[value + 1]
         }
         if (hint === stylehint_Oblique) {
             stylevalue = value ? 'italic' : 'normal'

src/glkapi/windows.ts

@@ -9,6 +9,8 @@ https://github.com/curiousdannii/asyncglk
 
 */
 
+import {cloneDeep} from 'lodash-es'
+
 import {BufferWindowImage, ContentUpdate, GraphicsWindowOperation, InputUpdate, TextRun, WindowStyles, WindowUpdate as SizeUpdate} from '../common/protocol.js'
 
 import {winmethod_Above, winmethod_BorderMask, winmethod_DirMask, winmethod_DivisionMask, winmethod_Fixed, winmethod_Left, winmethod_Right, wintype_Blank, wintype_Graphics, wintype_Pair, wintype_TextBuffer, wintype_TextGrid} from './constants.js'
@@ -109,7 +111,7 @@ export abstract class TextWindow extends WindowBase {
 
     constructor(rock: number, stylehints: WindowStyles) {
         super(rock)
-        this.stylehints = stylehints
+        this.stylehints = cloneDeep(stylehints)
     }
 
     update(): WindowUpdate {