feat(storage) optional persistant history

README.md

@@ -25,20 +25,33 @@ That's it!
 
 Oh, one more thing, you can define an optional filter if you don't want some things to be saved.
 
+Hold on, `neoclip` optionally also supports persistent history between sessions powered by [`sqlite.lua`](https://github.com/tami5/sqlite.lua).
+
 ![neoclip](https://user-images.githubusercontent.com/23341710/129557093-7724e7eb-7427-4c53-aa98-55e624843589.png)
 
 
 ## Installation
 ```lua
 use {
-    "AckslD/nvim-neoclip.lua",
-    config = function()
-        require('neoclip').setup()
-    end,
+  "AckslD/nvim-neoclip.lua",
+  config = function()
+    require('neoclip').setup()
+  end,
 }
 ```
 When `require('neoclip').setup()` is called, only the autocommand (for `TextYankPost` event) is setup to save yanked things. This means that `telescope` is not required at this point if you lazy load it.
 
+If you want to use persistent history between sessions you also need [`sqlite.lua`](https://github.com/tami5/sqlite.lua) installed, for example by:
+```lua
+use {
+  "AckslD/nvim-neoclip.lua",
+  requires = {'tami5/sqlite.lua', module = 'sqlite'},
+  config = function()
+    require('neoclip').setup()
+  end,
+}
+```
+
 ## Configuration
 You can configure `neoclip` by passing a table to `setup` (all are optional).
 The following are the defaults and the keys are explained below:
@@ -48,6 +61,8 @@ use {
   config = function()
     require('neoclip').setup({
       history = 1000,
+      enable_persistant_history = false,
+      db_path = vim.fn.stdpath("data") .. "/databases/neoclip.sqlite3",
       filter = nil,
       preview = true,
       default_register = '"',
@@ -72,6 +87,9 @@ use {
 }
 ```
 * `history`: The max number of entries to store (default 1000).
+* `enable_persistant_history`: If set to `true` the history is stored on `VimLeavePre` using [`sqlite.lua`](https://github.com/tami5/sqlite.lua) and lazy loaded when querying.
+* `db_path`: The path to the sqlite database to store history if `enable_persistant_history=true`.
+  Defaults to `vim.fn.stdpath("data") .. "/databases/neoclip.sqlite3` which on my system is `~/.local/share/nvim/databases/neoclip.sqlite3`
 * `filter`: A function to filter what entries to store (default all are stored).
   This function filter should return `true` (include the yanked entry) or `false` (don't include it) based on a table as the only argument, which has the following keys:
   * `event`: The event from `TextYankPost` (see `:help TextYankPost` for which keys it contains).

lua/neoclip.lua

@@ -9,6 +9,7 @@ local function setup_auto_command()
         augroup neoclip
             autocmd!
             autocmd TextYankPost * :lua require("neoclip.handlers").handle_yank_post()
+            autocmd VimLeavePre * :lua require("neoclip.handlers").on_exit()
         augroup end
     ]])
 end
@@ -25,6 +26,10 @@ M.toggle = function()
     M.stopped = not M.stopped
 end
 
+M.clear_history = function()
+    require('neoclip.storage').clear()
+end
+
 M.setup = function(opts)
     settings.setup(opts)
     setup_auto_command()

lua/neoclip/db.lua

@@ -0,0 +1,68 @@
+local settings = require('neoclip.settings').get()
+
+local M = {}
+
+local has_sqlite, sqlite = pcall(require, "sqlite")
+if not has_sqlite then
+    print "Couldn't find sqlite.lua. Cannot use persistent history"
+    return nil
+end
+
+local function dirname(str)
+    return string.match(str, '(.*[/\\])')
+end
+
+local function make_db_dir(db_path)
+    os.execute('mkdir -p ' .. dirname(db_path))
+end
+
+local function get_tbl()
+    local db_path = settings.db_path
+    make_db_dir(db_path)
+    local db = sqlite.new(db_path)
+    db:open()
+    local tbl = db:tbl("neoclip", {
+        regtype = "text",
+        contents = "luatable",
+        filetype = "text",
+    })
+
+    return tbl
+end
+
+M.tbl = get_tbl()
+
+local function copy(t)
+    local new = {}
+    for k, v in pairs(t) do
+        if type(v) == 'table' then
+            new[k] = copy(v)
+        else
+            new[k] = v
+        end
+    end
+    return new
+end
+
+M.get = function(query)
+    local success, entries = pcall(M.tbl.get, M.tbl, query)
+    if success then
+        return entries
+    else
+        print("Couldn't load history since:", entries)
+        return {}
+    end
+end
+
+M.update = function(storage)
+    local success, msg = pcall(M.tbl.remove, M.tbl)
+    if not success then
+        print("Couldn't remove clear database since:", msg)
+    end
+    success, msg = pcall(M.tbl.insert, M.tbl, storage)
+    if not success then
+        print("Couldn't insert in database since:", msg)
+    end
+end
+
+return M

lua/neoclip/handlers.lua

@@ -41,6 +41,10 @@ M.handle_yank_post = function()
     end
 end
 
+M.on_exit = function()
+    storage.on_exit()
+end
+
 M.set_register = function(register_name, entry)
     vim.fn.setreg(register_name, entry.contents, entry.regtype)
 end

lua/neoclip/settings.lua

@@ -2,6 +2,8 @@ local M = {}
 
 local settings = {
     history = 1000,
+    enable_persistant_history = false,
+    db_path = vim.fn.stdpath("data") .. "/databases/neoclip.sqlite3",
     filter = nil,
     preview = true,
     default_register = '"',

lua/neoclip/storage.lua

@@ -3,16 +3,31 @@ local M = {}
 local settings = require('neoclip.settings').get()
 
 local storage = {}
+if settings.enable_persistant_history then
+    storage = require('neoclip.db').get()
+end
 
 M.get = function()
     return storage
 end
 
 M.insert = function(contents)
-    if #storage >= settings.history then
+    while #storage >= settings.history do
         table.remove(storage, #storage)
     end
     table.insert(storage, 1, contents)
 end
 
+M.clear = function()
+    while #storage > 0 do
+        table.remove(storage, 1)
+    end
+end
+
+M.on_exit = function()
+    if settings.enable_persistant_history then
+        require('neoclip.db').update(storage)
+    end
+end
+
 return M