From 3238cfb952eebc532d6a9b12089460b3992b5327 Mon Sep 17 00:00:00 2001
From: Avimitin <avimitin@gmail.com>
Date: Tue, 21 Feb 2023 15:24:36 +0800
Subject: [PATCH] keymap: add buffer delete key mappings

Signed-off-by: Avimitin <avimitin@gmail.com>

Former-commit-id: 7ad80c8df1b868783b3c4d6fd34ef25b91d87e40
Former-commit-id: 10e13a55e0d91241e19e56372d92c97552bb615e
Former-commit-id: 30d58a38375e7f0866521f66da0be689fb0a939c
---
 lua/core/keymap.lua |  2 +-
 lua/libs/bufdel.lua | 87 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 lua/libs/bufdel.lua

diff --git a/lua/core/keymap.lua b/lua/core/keymap.lua
index a1e7201b..1a7133a2 100644
--- a/lua/core/keymap.lua
+++ b/lua/core/keymap.lua
@@ -16,7 +16,7 @@ map_utils.nmap({
   {
     "<leader>q",
     function()
-      print("Unimplemented")
+      require("libs.bufdel").delete_buffer_expr("", false)
     end,
     desc = "Close current buffer",
   },
diff --git a/lua/libs/bufdel.lua b/lua/libs/bufdel.lua
new file mode 100644
index 00000000..6a90fc9a
--- /dev/null
+++ b/lua/libs/bufdel.lua
@@ -0,0 +1,87 @@
+-- nvim-bufdel
+-- By Olivier Roques
+-- github.com/ojroques
+
+local M = {}
+
+-- Switch to buffer 'buf' on each window from list 'windows'
+local function switch_buffer(windows, buf)
+  local cur_win = vim.fn.winnr()
+  for _, winid in ipairs(windows) do
+    vim.cmd(string.format("%d wincmd w", vim.fn.win_id2win(winid)))
+    vim.cmd(string.format("buffer %d", buf))
+  end
+  vim.cmd(string.format("%d wincmd w", cur_win))
+end
+
+-- Select the next buffer to display
+local function get_next_buf(buf)
+  -- build table mapping buffers to their actual position
+  local buffers, buf_index = {}, 1
+  for i, bufinfo in ipairs(vim.fn.getbufinfo({ buflisted = 1 })) do
+    if buf == bufinfo.bufnr then
+      buf_index = i
+    end
+    table.insert(buffers, bufinfo.bufnr)
+  end
+  -- select next buffer according to user choice
+  if buf_index == #buffers and #buffers > 1 then
+    return buffers[#buffers - 1]
+  end
+  return buffers[buf_index % #buffers + 1]
+end
+
+-- Delete a buffer, ignoring changes if 'force' is set
+local function delete_buffer(buf, force)
+  if vim.fn.buflisted(buf) == 0 then
+    return
+  end
+  -- retrieve buffer and delete it while preserving window layout
+  local next_buf = get_next_buf(buf)
+  local windows = vim.fn.getbufinfo(buf)[1].windows
+  switch_buffer(windows, next_buf)
+  -- force deletion of terminal buffers
+  if force or vim.fn.getbufvar(buf, "&buftype") == "terminal" then
+    vim.cmd(string.format("bd! %d", buf))
+  else
+    vim.cmd(string.format("silent! confirm bd %d", buf))
+  end
+  -- revert buffer switches if deletion was cancelled
+  if vim.fn.buflisted(buf) == 1 then
+    switch_buffer(windows, buf)
+  end
+end
+
+-- Delete a given buffer, ignoring changes if 'force' is set
+function M.delete_buffer_expr(bufexpr, force)
+  if #vim.fn.getbufinfo({ buflisted = 1 }) < 2 then
+    -- exit when there is only one buffer left
+    if force then
+      vim.cmd("qall!")
+    else
+      vim.cmd("confirm qall")
+    end
+    return
+  end
+  -- retrieve buffer number from buffer expression
+  if not bufexpr then
+    delete_buffer(vim.fn.bufnr(), force)
+  end
+  if tonumber(bufexpr) then
+    delete_buffer(tonumber(bufexpr), force)
+  end
+  bufexpr = string.gsub(bufexpr, [[^['"]+]], "") -- escape any start quote
+  bufexpr = string.gsub(bufexpr, [[['"]+$]], "") -- escape any end quote
+  delete_buffer(vim.fn.bufnr(bufexpr), force)
+end
+
+-- Delete all listed buffers except current, ignoring changes if 'force' is set
+function M.delete_buffer_others(force)
+  for _, bufinfo in ipairs(vim.fn.getbufinfo({ buflisted = 1 })) do
+    if bufinfo.bufnr ~= vim.fn.bufnr() then
+      delete_buffer(bufinfo.bufnr, force)
+    end
+  end
+end
+
+return M