added autosave plugin

2 files changed, 46 insertions, 0 deletions

diff --git a/README.md b/README.md
index 0859664..e224d53 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ with the official version of lite, format the name in italic.*
 Plugin | Description
 -------|-----------------------------------------
 [`autoinsert`](plugins/autoinsert.lua?raw=1) | Automatically inserts closing brackets and quotes
+*[`autosave`](plugins/autosave.lua?raw=1)* | Automatically saves files when they are changed 
 [`autowrap`](plugins/autowrap.lua?raw=1) | Automatically hardwraps lines when typing
 *[`bigclock`](plugins/bigclock.lua?raw=1)* | Shows the current time and date in a view with large text *([screenshot](https://user-images.githubusercontent.com/3920290/82752891-3318df00-9db9-11ea-803f-261d80d5cf53.png))*
 [`black`](https://git.sr.ht/~tmpod/black-lite)* | Integrates the [black](https://github.com/psf/black) Python formatter with lite
diff --git a/plugins/autosave.lua b/plugins/autosave.lua
new file mode 100644
index 0000000..11337f7
--- /dev/null
+++ b/plugins/autosave.lua
@@ -0,0 +1,45 @@
+local core = require "core"
+local config = require "core.config"
+local Doc = require "core.doc"
+local DocView = require "core.docview"
+local command = require "core.command"
+-- this is used to detect the wait time
+local last_keypress = os.time()
+-- this exists so that we don't end up with multiple copies of the loop running at once
+local looping = false
+local on_text_change = Doc.on_text_change
+-- the approximate amount of time, in seconds, that it takes to trigger an autosave
+config.autosave_timeout = 1
+
+
+local function loop_for_save()
+  if not looping then
+    looping = true
+    while looping do
+      if os.difftime(os.time(), last_keypress) >= config.autosave_timeout then
+        command.perform "doc:save"
+        -- stop loop
+        looping = false
+      end
+      -- dividing by five is completely arbitrary but it seemed to work well so idc
+      coroutine.yield(config.autosave_timeout) 
+    end
+  end
+end
+
+
+local function updatepress()
+  -- set last keypress time to now
+  last_keypress = os.time()
+  -- put loop in coroutine so it doesn't lag out this script
+  core.add_thread(loop_for_save)
+end
+
+
+function Doc:on_text_change(type)
+  -- check if file is saved
+  if core.active_view:get_name() ~= "unsaved*" then
+    updatepress()
+  end
+  return on_text_change(type)
+end