split into multiple files

init.lua

@@ -0,0 +1,7 @@
+-- get directory of this file
+local config_dir = vim.fn.fnamemodify(debug.getinfo(1, "S").source:sub(2), ":h")
+
+-- prepend it to Lua's search path
+package.path = config_dir .. "/?.lua;" .. config_dir .. "/?/init.lua;" .. package.path
+
+require("sentence_lines")

sentence_lines.lua

@@ -0,0 +1,23 @@
+local function split_sentences_paragraph()
+    -- save cursor and window view
+    local view = vim.fn.winsaveview()
+
+    -- find the paragraph boundaries
+    local start_line = vim.fn.search('^\\s*$', 'bnW') + 1
+    if start_line == 1 then start_line = 1 end
+    local end_line = vim.fn.search('^\\s*$', 'nW') - 1
+    if end_line < start_line then end_line = vim.fn.line('$') end
+
+    -- build a range and run substitute with 'e' flag
+    local cmd = string.format("%d,%ds/\\([.?!]\\)\\s\\+/\\1\r/ge", start_line, end_line)
+    vim.cmd(cmd)
+
+    -- restore cursor
+    vim.fn.winrestview(view)
+end
+
+-- run after leaving insert mode
+vim.api.nvim_create_autocmd({ "InsertLeave", "TextChanged" }, {
+    pattern = { "*.md", "*.txt" },
+    callback = split_sentences_paragraph
+})