1 files changed, 94 insertions, 0 deletions
diff --git a/lua/buffer-browser.lua b/lua/buffer-browser.lua
new file mode 100644
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+++ b/lua/buffer-browser.lua
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+-- BUFFER BROWSER
+-- Author: Marc Coquand
+-- See readme for explanation on what it does.
+-- This code contains examples that can be used to test the code.
+-- Run them in `lua %`
+-- or with a code runner, like sniprun.
+local api = vim.api
+
+local function StateAppend(bufName, state, filters)
+	-- State has three fields, current = current buffer, previous = previous buffer, and future = future buffers
+	-- This function clears the future, and appends the current to the previous, and sets the current to the next
+
+	-- If filters matches the bufName, skip the buffer
+	if filters ~= nil then
+		for _, filter in ipairs(filters) do
+			if string.match(bufName, filter) then
+				return state
+			end
+		end
+	end
+
+	-- Clear the future
+	state.future = {}
+	-- Append the current to the previous
+	table.insert(state.previous, state.current)
+	-- Set the current to the next
+	state.current = bufName
+
+	return state
+end
+-- Test StateAppend
+-- local state = { current = 1, previous = { 2, 3 }, future = { 4, 5 } }
+-- print(StateAppend(6, state, {})['current'])
+-- -- > 6
+-- state = { current = 1, previous = { 2, 3 }, future = { 4, 5 } }
+-- print(StateAppend(6, state, {})['previous'][1])
+-- -- > 2
+-- state = { current = 1, previous = { 2, 3 }, future = { 4, 5 } }
+-- print(StateAppend(6, state, { 6 })['current'])
+-- -- > 1
+
+local function StateGoBack(state)
+	-- Go back in the state by setting current to the first element of previous, and appending the current to the future
+	-- Check if past is empty, if so return state as is
+	if #state.previous == 0 then
+		return state
+	end
+
+	table.insert(state.future, state.current)
+	state.current = table.remove(state.previous, 1)
+	return state
+end
+-- Test StateGoBack
+-- local state = { current = 1, previous = { 2, 3 }, future = { 4, 5 } }
+-- print(StateGoBack(StateGoBack(StateGoBack(state)))['current'])
+-- > 3
+
+local function StateGoForward(state)
+	-- Go forward in the state by setting current to the first element of future, and appending the current to the previous
+
+	-- Check if future is empty, if so return state as is
+	if #state.future == 0 then
+		return state
+	end
+
+	table.insert(state.previous, state.current)
+	state.current = table.remove(state.future, 1)
+
+	return state
+end
+-- Test StateGoForward
+-- local state = { current = 1, previous = { 2, 3 }, future = { 4, 5 } }
+-- print(StateGoForward(StateGoForward(StateGoForward(state)))['current'])
+-- > 5
+
+function BufferEnter()
+	local bufName = api.nvim_buf_get_name(0)
+	local state = vim.g.buffer_browser_state
+	local filters = vim.g.buffer_browser_filters
+	vim.g.buffer_browser_state = StateAppend(bufName, state, filters)
+end
+
+local BufferBrowserGroup = api.nvim_create_augroup('BufferBrowser')
+
+api.nvim_create_autocmd('WinEnter', {
+	'*',
+	'lua BufferEnter()',
+	{ group = BufferBrowserGroup }
+})
+api.nvim_create_autocmd('BufEnter', {
+	'*',
+	'lua BufferEnter()',
+	{ group = BufferBrowserGroup }
+})