1 files changed, 122 insertions, 0 deletions
diff --git a/config/essentials/vis/cursors.lua b/config/essentials/vis/cursors.lua
new file mode 100644
index 0000000..a4e7fa3
--- /dev/null
+++ b/config/essentials/vis/cursors.lua
@@ -0,0 +1,122 @@
+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