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local M = {}
local cursors = {}
local files = {}
-- default maxsize
M.maxsize = 1000
-- get the default system cache directory
local get_default_cache_path = function()
local HOME = os.getenv('HOME')
local XDG_CACHE_HOME = os.getenv('XDG_CACHE_HOME')
local BASE = XDG_CACHE_HOME or HOME
return BASE .. '/.vis-cursors'
end
-- default save path
M.path = get_default_cache_path()
local read_files = function()
-- read file
local file = io.open(M.path)
if file == nil then
return
end
files = {}
-- read positions per file path
for line in file:lines() do
for path, pos in string.gmatch(line, '(.+)[,%s](%d+)') do
cursors[path] = pos
table.insert(files, path)
end
end
file:close()
end
-- read cursors from file on init
local on_init = function()
read_files()
end
-- apply cursor pos on win open
local on_win_open = function(win)
if win.file == nil or win.file.path == nil then
return
end
-- init cursor path if nil
local pos = cursors[win.file.path]
if pos == nil then
cursors[win.file.path] = win.selection.pos
return
end
-- set current cursor
win.selection.pos = tonumber(pos)
-- center view around cursor
vis:feedkeys("zz")
end
-- set cursor pos on close
local on_win_close = function(win)
if win.file == nil or win.file.path == nil then
return
end
-- re-read files in case they've changed
read_files()
-- remove old occurences of current path
for i, path in ipairs(files) do
if path == win.file.path then
table.remove(files, i)
end
end
-- ignore files with cursor at the beginning
if win.selection.pos == 0 then
return
end
-- insert current path to top of files
table.insert(files, 1, win.file.path)
-- set cursor pos for current file path
cursors[win.file.path] = win.selection.pos
end
-- write cursors to file on quit
local on_quit = function()
local file = io.open(M.path, 'w+')
if file == nil then
return
end
-- buffer cursors string
local buffer = {}
for _, path in ipairs(files) do
table.insert(buffer, string.format('%s,%d', path, cursors[path]))
if M.maxsize and #buffer >= M.maxsize then
break
end
end
local output = table.concat(buffer, '\n')
file:write(output)
file:close()
end
vis.events.subscribe(vis.events.INIT, on_init)
vis.events.subscribe(vis.events.WIN_OPEN, on_win_open)
vis.events.subscribe(vis.events.WIN_CLOSE, on_win_close)
vis.events.subscribe(vis.events.QUIT, on_quit)
return M
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