1 files changed, 87 insertions, 0 deletions
diff --git a/configs/nvim/lua/crupest/nvim.lua b/configs/nvim/lua/crupest/nvim.lua
new file mode 100644
index 0000000..2eea4f1
--- /dev/null
+++ b/configs/nvim/lua/crupest/nvim.lua
@@ -0,0 +1,87 @@
+local function list_listed_bufs()
+    local bufs = vim.api.nvim_list_bufs()
+    local result = {}
+    for _, v in ipairs(bufs) do
+        if vim.fn.buflisted(v) ~= 0 then
+            table.insert(result, v)
+        end
+    end
+    return result
+end
+
+local function get_previous_buffer(buf)
+    local bufs = list_listed_bufs()
+
+    -- no buffers at all
+    if #bufs == 0 then return nil end
+
+    -- find the buf in bufs
+    local index = 0
+    for i, v in ipairs(bufs) do
+        if buf == v then
+            index = i
+            break
+        end
+    end
+
+    -- it's the only one
+    if #bufs == 1 and index == 1 then
+        return nil
+    end
+
+    -- it's the first one
+    if index == 1 then
+        return bufs[2]
+    end
+
+    return bufs[index - 1]
+end
+
+local function list_wins_editing_buf(buf)
+    local wins = vim.api.nvim_list_wins()
+    local result = {}
+    for _, win in ipairs(wins) do
+        if vim.api.nvim_win_get_buf(win) == buf then
+            table.insert(result, win)
+        end
+    end
+    return result
+end
+
+local function win_close_buf()
+    local current_buffer = vim.api.nvim_get_current_buf()
+    local jumps_info = vim.fn.getjumplist()
+
+    local old_jump_list = { unpack(jumps_info[1], 1, jumps_info[2]) }
+    while #old_jump_list ~= 0 do
+        local last_jump = old_jump_list[#old_jump_list]
+        if last_jump.bufnr ~= current_buffer and vim.fn.bufexists(last_jump.bufnr) ~= 0 and vim.fn.buflisted(last_jump.bufnr) ~= 0 then
+            break
+        end
+        table.remove(old_jump_list, #old_jump_list)
+    end
+
+    if #old_jump_list ~= 0 then
+        local last_jump = old_jump_list[#old_jump_list]
+        vim.api.nvim_win_set_buf(0, last_jump.bufnr)
+        vim.api.nvim_win_set_cursor(0, {last_jump.lnum, last_jump.col})
+    else
+        local previous_buf = get_previous_buffer(current_buffer)
+        if previous_buf then
+            vim.api.nvim_win_set_buf(0, previous_buf)
+        else
+            local new_buf = vim.api.nvim_create_buf(true, false)
+            vim.api.nvim_win_set_buf(0, new_buf)
+        end
+    end
+
+    vim.api.nvim_buf_delete(current_buffer, {})
+end
+
+return {
+    list_listed_bufs = list_listed_bufs,
+    get_previous_buffer = get_previous_buffer,
+    list_wins_editing_buf = list_wins_editing_buf,
+    win_close_buf = win_close_buf
+}
+