1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172

use std::any::Any;

use crate::{
    buffer::BufferHandle,
    buffer_position::{BufferPosition, BufferRange},
    client::ClientHandle,
    editor::{EditorContext, EditorFlow, KeysIterator},
    help,
    platform::{PlatformIpcHandle, PlatformProcessHandle},
    ResourceFile,
};

#[derive(Clone, Copy, PartialEq, Eq)]
pub struct PluginHandle(pub(crate) u32);

#[derive(Clone, Copy)]
pub struct PluginDefinition {
    pub instantiate: fn(PluginHandle, &mut EditorContext) -> Option<Plugin>,
    pub help_pages: &'static [ResourceFile],
}

pub struct Plugin {
    pub data: Box<dyn Any>,

    pub on_editor_events: fn(PluginHandle, &mut EditorContext),

    pub on_process_spawned: fn(PluginHandle, &mut EditorContext, u32, PlatformProcessHandle),
    pub on_process_output: fn(PluginHandle, &mut EditorContext, u32, &[u8]),
    pub on_process_exit: fn(PluginHandle, &mut EditorContext, u32),

    pub on_ipc_connected: fn(PluginHandle, &mut EditorContext, u32, PlatformIpcHandle),
    pub on_ipc_output: fn(PluginHandle, &mut EditorContext, u32, &[u8]),
    pub on_ipc_close: fn(PluginHandle, &mut EditorContext, u32),

    pub on_keys: fn(
        PluginHandle,
        &mut EditorContext,
        client_handle: ClientHandle,
        keys: &mut KeysIterator,
    ) -> Option<EditorFlow>,
    pub on_completion: fn(PluginHandle, &mut EditorContext, &CompletionContext) -> bool,
}
impl Default for Plugin {
    fn default() -> Self {
        Self {
            data: Box::new(()),

            on_editor_events: |_, _| (),

            on_process_spawned: |_, _, _, _| (),
            on_process_output: |_, _, _, _| (),
            on_process_exit: |_, _, _| (),

            on_ipc_connected: |_, _, _, _| (),
            on_ipc_output: |_, _, _, _| (),
            on_ipc_close: |_, _, _| (),

            on_keys: |_, _, _, _| Some(EditorFlow::Continue),
            on_completion: |_, _, _| false,
        }
    }
}

pub struct CompletionContext {
    pub client_handle: ClientHandle,
    pub buffer_handle: BufferHandle,
    pub word_range: BufferRange,
    pub cursor_position: BufferPosition,
    pub completion_requested: bool,
}

#[derive(Default)]
pub struct PluginCollection {
    plugins: Vec<Plugin>,
}
impl PluginCollection {
    pub(crate) fn add(ctx: &mut EditorContext, definition: PluginDefinition) {
        help::add_help_pages(definition.help_pages);

        let handle = PluginHandle(ctx.plugins.plugins.len() as _);
        if let Some(plugin) = (definition.instantiate)(handle, ctx) {
            ctx.plugins.plugins.push(plugin);
        };
    }

    pub fn get_as<T>(&mut self, handle: PluginHandle) -> &mut T
    where
        T: Any,
    {
        match self.plugins[handle.0 as usize].data.downcast_mut::<T>() {
            Some(plugin) => plugin,
            None => panic!(
                "plugin with handle {} was not of type '{}'",
                handle.0,
                std::any::type_name::<T>()
            ),
        }
    }

    pub(crate) fn get(&self, handle: PluginHandle) -> &Plugin {
        &self.plugins[handle.0 as usize]
    }

    pub(crate) fn handles(&self) -> impl Iterator<Item = PluginHandle> {
        std::iter::repeat(())
            .take(self.plugins.len())
            .enumerate()
            .map(|(i, _)| PluginHandle(i as _))
    }

    pub(crate) fn on_editor_events(ctx: &mut EditorContext) {
        for i in 0..ctx.plugins.plugins.len() {
            let handle = PluginHandle(i as _);
            let f = ctx.plugins.plugins[i].on_editor_events;
            f(handle, ctx);
        }
    }

    pub(crate) fn on_process_spawned(
        ctx: &mut EditorContext,
        plugin_handle: PluginHandle,
        process_id: u32,
        process_handle: PlatformProcessHandle,
    ) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_process_spawned;
        f(plugin_handle, ctx, process_id, process_handle);
    }

    pub(crate) fn on_process_output(
        ctx: &mut EditorContext,
        plugin_handle: PluginHandle,
        process_id: u32,
        bytes: &[u8],
    ) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_process_output;
        f(plugin_handle, ctx, process_id, bytes);
    }

    pub(crate) fn on_process_exit(
        ctx: &mut EditorContext,
        plugin_handle: PluginHandle,
        process_id: u32,
    ) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_process_exit;
        f(plugin_handle, ctx, process_id);
    }

    pub(crate) fn on_ipc_connected(
        ctx: &mut EditorContext,
        plugin_handle: PluginHandle,
        ipc_id: u32,
        ipc_handle: PlatformIpcHandle,
    ) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_ipc_connected;
        f(plugin_handle, ctx, ipc_id, ipc_handle);
    }

    pub(crate) fn on_ipc_output(
        ctx: &mut EditorContext,
        plugin_handle: PluginHandle,
        ipc_id: u32,
        bytes: &[u8],
    ) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_ipc_output;
        f(plugin_handle, ctx, ipc_id, bytes);
    }

    pub(crate) fn on_ipc_close(ctx: &mut EditorContext, plugin_handle: PluginHandle, ipc_id: u32) {
        let f = ctx.plugins.plugins[plugin_handle.0 as usize].on_ipc_close;
        f(plugin_handle, ctx, ipc_id);
    }
}