feat(infra): initial plugin system

- Added the ability to load and keep track of several plugins at once
- Removed `wasm-wip` feature flag, enabling plugins in all builds
- `split_space` now returns a tuple with the `part_position_and_size` (as before) plus a cloned version of the part, so plugins and terminals can be distinguished by its users
- Added a `Draw` instruction for rendering plugins when asked to by Mosaic
- Added a new `PluginPane`, implementing `Pane` for plugins!
- Replaced RawFd as a pane-identifier with the `PaneId` enum in most places
- `change_size` -> `change_pos_and_size`, with the functionality updated to fit the new name
- `buffer_as_vte_output` -> `render`
- `pid()` on the `Pane` trait now returns a `PaneId`
- Changed lots of functions in `tab.rs` to be more pane oriented, renaming some to remove the `terminal` and switching to `PaneId`s
- splitting functions in `tab.rs` now correctly update the positions of returned fragments
- Used `PaneId`'s as a replacement for `PaneKind` in the tab `BTreeMap`
- Removed `get_rows` and `get_columns` from the `Pane` trait
- Layouts can now create plugin panes!
- Changed lots of the `active_terminal` stuff in `tab.rs` to work with all panes
- Changed the `Tab` `render` function, so that common requirements are moved there and out of the `Pane::render()` methods
- Added a `shared.rs` to `utils` with a couple of useful functions
- We can now accept input and pass it to plugins via serialised JSON
- Trigger a screen render after handling input meant for a plugin
- Allow plugins to be properly closed
- Allow plugin panes to be split (opening a new terminal)
- Allow plugin API functions to send messages on the PTY bus
- Added the API functionality needed for a plugin to open a file in a new pane
- No more compiler warnings!
- Fixed 53 clippy lints!

1 files changed, 19 insertions, 0 deletions

diff --git a/src/utils/shared.rs b/src/utils/shared.rs
new file mode 100644
index 00000000..1d8ca5c3
--- /dev/null
+++ b/src/utils/shared.rs
@@ -0,0 +1,19 @@
+use std::{iter, str::from_utf8};
+
+use strip_ansi_escapes::strip;
+
+pub fn ansi_len(s: &str) -> usize {
+    from_utf8(&strip(s.as_bytes()).unwrap())
+        .unwrap()
+        .chars()
+        .count()
+}
+
+pub fn pad_to_size(s: &str, rows: usize, columns: usize) -> String {
+    s.lines()
+        .map(|l| [l, &str::repeat(" ", columns - ansi_len(l))].concat())
+        .chain(iter::repeat(str::repeat(" ", columns)))
+        .take(rows)
+        .collect::<Vec<_>>()
+        .join("\n\r")
+}