OSC: Change ::OscSend format and restore String support to Button Actions. (#388)

* OscSend: support strings poc
- change value delimiter to `;`
- default convert values to String when not converted to another type

* add `_arg<n>="<value>"` format instead of `;` delimiter
that is, vrchat chatbox is controlled like `_press="::OscSend /chatbox/input" _arg0="${send}" _arg1="true" _arg2="true"` now

old format still supported as shorthand, with same "strings can't have spaces" limit as before. `_arg<n>` are appended after these.

* fix accidentally resetting `osc_args` to empty between formats

* update readme to document `::OscSend` paramter-form

* clean up, use `while let` instead of `while match`

* merge `parse_osc_value` into while condition

* remove second log from shortform arg parsing

wayvr/src/gui/README.md

@@ -80,22 +80,40 @@ This button action executes a shell script using the `sh` shell.
 <button _press="::ShellExec $HOME/myscript.sh test-argument" [...] />
 ```
 
-##### `::OscSend <path> <args ..>`
+##### `::OscSend <path>` `::OscSend <path> <args ..>`
 
 Send an OSC message. The target port comes from the `osc_out_port` configuration setting.
 
+There are two formats; here is an example for both formats writing a message to the VRChat Chatbox:
 ```xml
-<button _press="::OscSend /avatar/parameters/MyInt 1i32" [...] />
+<!-- parameter form - OSC arguments are listed as parameters labelled `_arg<n>` where `n` is 0-indexed -->
+<Button _press="::OscSend /chatbox/input" _arg0="Hello World! I am WayVR." _arg1="true" _arg2="true"> </Button>
+<!-- will send: ("Hello World! I am WayVR.", True, True) to /chatbox/input -->
+```
+
+```xml
+<!-- shorthand form - OSC arguments are space-separated in one string. note that single strings cannot contain spaces -->
+<Button _press="::OscSend /chatbox/input Hello_World!_I_am_WayVR. true true"> </Button>
+<!-- will send: ("Hello_World!_I_am_WayVR.", True, True) to /chatbox/input -->
+```
+
+The two can be combined; parameter-form arguments will be appended after shorthand-form arguments:
+```xml
+<!-- combined-form - rectangle bounds with a name -->
+<Button _press="::OscSend /graphthing/rectangle 0i32 0i32 50i32 200i32" _arg0="tall rectangle"> </Button>
+<!-- will send: (0, 0, 50, 200, "tall rectangle") to /graphthing/rectangle -->
 ```
 
 Available argument value types (case insensitive):
 - Bool: `true` or `false`
 - Nil: `nil`
 - Inf: `inf`
-- Int: `-1i32`, `1i32`, etc
-- Long: `-1i64`, `1i64`, etc
-- Float: `1f32`, `1.0f32`, etc
-- Double: `1f64`, `1.0f64`, etc
+- Int: suffix `i32` (`-1i32`, `1i32`, etc)
+- Long: suffix `i64` (`-1i64`, `1i64`, etc)
+- Float: suffix `f32` (`1f32`, `1.0f32`, etc)
+- Double: suffix `f64` (`1f64`, `1.0f64`, etc)
+- String: any other value
+    - Shorthand form will treat Strings with spaces as multiple arguments. Use parameter form if you need spaces.
 
 ##### `::SendKey <VirtualKey> <UP|DOWN>`
 

wayvr/src/gui/panel/button.rs

@@ -692,15 +692,28 @@ pub(super) fn setup_custom_button<S: 'static>(
                 };
 
                 let mut osc_args = vec![];
+
+                // collect arguments specified in the initial string
                 for arg in args {
-                    let Ok(osc_arg) = parse_osc_value(arg)
-                        .inspect_err(|e| log::warn!("Could not parse OSC value '{arg}': {e:?}"))
-                    else {
-                        let msg = format!("expected OscValue, found \"{arg}\"");
+                    if let Ok(osc_arg) = parse_osc_value(arg).inspect_err(|e| {
+                        let msg = format!("Could not parse OSC value \"{arg}\": {e:?}");
                         log_cmd_invalid_arg(parser_state, TAG, name, command, &msg);
                         return;
-                    };
+                    }) {
+                        osc_args.push(osc_arg);
+                    }
+                }
+
+                // collect arguments from _arg<n> attributes.
+                let mut arg_index = 0;
+                while let Some(arg) = attribs.get_value(&format!("_arg{arg_index}"))
+                    && let Ok(osc_arg) = parse_osc_value(arg).inspect_err(|e| {
+                        let msg = format!("Could not parse OSC value \"{arg}\": {e:?}");
+                        log_cmd_invalid_arg(parser_state, TAG, name, command, &msg);
+                    })
+                {
                     osc_args.push(osc_arg);
+                    arg_index += 1;
                 }
 
                 Box::new(move |_common, data, app, _| {

wayvr/src/subsystem/osc.rs

@@ -243,7 +243,7 @@ pub fn parse_osc_value(s: &str) -> anyhow::Result<OscType> {
                 }
             }
 
-            anyhow::bail!("Unknown OSC type literal: {s}")
+            Ok(OscType::String(s.to_string()))
         }
     }
 }