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-rw-r--r--lua/buffer-browser.lua94
1 files changed, 94 insertions, 0 deletions
diff --git a/lua/buffer-browser.lua b/lua/buffer-browser.lua
new file mode 100644
index 0000000..c6a41a8
--- /dev/null
+++ b/lua/buffer-browser.lua
@@ -0,0 +1,94 @@
+-- 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 }
+})