Repository navigation
Expand file tree
/
Copy pathpromise.lua
More file actions
146 lines (130 loc) · 3.29 KB
/
Copy pathpromise.lua
File metadata and controls
146 lines (130 loc) · 3.29 KB
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
---@generic T
---@class Promise<T>
---@field and_then fun(self: self, callback: fun(value: any)): self
---@field resolve fun(self: self, value: any): self
---@field reject fun(self: self, err: any): self
---@field catch fun(self: self, callback: fun(err: any)): self
---@field wait fun(self: self, timeout?: integer, interval?: integer): any
---@field is_resolved fun(self: self): boolean
---@field is_rejected fun(self: self): boolean
---@field _resolved boolean
---@field _value any
---@field _error any
---@field _then_callbacks fun(value: any)[]
---@field _catch_callbacks fun(err: any)[]
local Promise = {}
Promise.__index = Promise
---Create a waitable promise that can be resolved or rejected later
---@generic T
---@return Promise<T>
function Promise.new()
local self = setmetatable({
_resolved = false,
_value = nil,
_error = nil,
_then_callbacks = {},
_catch_callbacks = {},
}, Promise)
return self
end
---@generic T
---@param self Promise<T>
---@param value T
---@return Promise<T>
function Promise:resolve(value)
if self._resolved then
return self
end
self._value = value
self._resolved = true
local schedule_then = vim.schedule_wrap(function(cb, v)
cb(v)
end)
for _, callback in ipairs(self._then_callbacks) do
schedule_then(callback, value)
end
return self
end
---@generic T
---@param self Promise<T>
---@param error any
---@return self
function Promise:reject(error)
if self._resolved then
return self
end
self._error = error
self._resolved = true
local schedule_catch = vim.schedule_wrap(function(cb, err)
cb(err)
end)
for _, callback in ipairs(self._catch_callbacks) do
schedule_catch(callback, error)
end
return self
end
---@generic T
---@param self self
---@param callback fun(value: T)
---@return self
function Promise:and_then(callback)
if not callback then
error('callback is required')
end
if self._resolved and not self._error then
local schedule_then = vim.schedule_wrap(function(cb, v)
cb(v)
end)
schedule_then(callback, self._value)
else
table.insert(self._then_callbacks, callback)
end
return self
end
---@generic T
---@param self self
---@param error_callback fun(err: any)
---@return self
function Promise:catch(error_callback)
if self._resolved and self._error then
local schedule_catch = vim.schedule_wrap(function(cb, err)
cb(err)
end)
schedule_catch(error_callback, self._error)
else
table.insert(self._catch_callbacks, error_callback)
end
return self
end
---@generic T
---@param self self
---@param timeout integer|nil Timeout in milliseconds (default: 5000)
---@param interval integer|nil Interval in milliseconds to check (default: 100)
---@return T
function Promise:wait(timeout, interval)
if self._resolved then
if self._error then
error(self._error)
end
return self._value
end
timeout = timeout or 5000
interval = interval or 100
local success = vim.wait(timeout, function()
return self._resolved
end, interval)
if not success then
error('Promise timed out after ' .. timeout .. 'ms')
end
if self._error then
error(self._error)
end
return self._value
end
function Promise:is_resolved()
return self._resolved
end
function Promise:is_rejected()
return self._resolved and self._error ~= nil
end
return Promise