neovim: refactor

1 files changed, 80 insertions, 0 deletions

diff --git a/.config/nvim/lua/autosave.lua b/.config/nvim/lua/autosave.lua
new file mode 100644
index 0000000..ae481ed
--- /dev/null
+++ b/.config/nvim/lua/autosave.lua
@@ -0,0 +1,80 @@
+local M = {}
+
+
+local INTERVAL_MS = 10 * 1000
+local SILENT = true
+
+
+-- Because a timer cannot be converted to Vim value,
+-- store indice of timers instead of timer instances.
+local timers = {}
+
+
+local function handler()
+   if not vim.bo.modified then
+      return
+   end
+   if vim.bo.readonly then
+      return
+   end
+   if vim.bo.buftype ~= '' then
+      return
+   end
+   if vim.fn.bufname() == '' then
+      return
+   end
+
+   if not SILENT then
+      vim.cmd([[echohl Comment]])
+      vim.cmd([[echo 'Auto-saving...']])
+      vim.cmd([[echohl None]])
+   end
+
+   vim.cmd([[silent! write]])
+
+   if not SILENT then
+      vim.cmd([[echohl Comment]])
+      vim.cmd([[echo 'Saved.']])
+      vim.cmd([[echohl None]])
+   end
+end
+
+
+function M.enable()
+   if vim.b.autosave_timer_id then
+      return
+   end
+
+   local timer = vim.loop.new_timer()
+   timer:start(INTERVAL_MS, INTERVAL_MS, vim.schedule_wrap(handler))
+   local tid = #timers + 1
+   timers[tid] = timer
+   vim.b.autosave_timer_id = tid
+end
+
+
+function M.disable()
+   if not vim.b.autosave_timer_id then
+      return
+   end
+
+   local tid = vim.b.autosave_timer_id
+   vim.b.autosave_timer_id = nil
+   if not timers[tid] then
+      return
+   end
+   timers[tid]:close()
+   timers[tid] = nil
+end
+
+
+function M.toggle()
+   if vim.b.autosave_timer_id then
+      M.disable()
+   else
+      M.enable()
+   end
+end
+
+
+return M