Merge branch 'main' of db:dotfiles

1 files changed, 105 insertions, 0 deletions

diff --git a/config/essentials/vis/cursors.lua b/config/essentials/vis/cursors.lua
new file mode 100644
index 0000000..5b3d43b
--- /dev/null
+++ b/config/essentials/vis/cursors.lua
@@ -0,0 +1,105 @@
+local M = {}
+local cursors = {}
+local files = {}
+
+-- default maxsize
+M.maxsize = 1000
+
+-- get the default system cache directory
+local function get_default_cache_path()
+    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 function read_files()
+
+    -- 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 function on_init() read_files() end
+
+-- apply cursor pos on win open
+local function on_win_open(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 function on_win_close(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 function on_quit()
+
+    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