ui,notifications: add a module which creates a notification popup

this commit adds a lua module for generating a notification popup.

wired into the async symbol gather function so users get an idea that
work is being done instead of just waiting for the calltree to open.

Signed-off-by: ldelossa <[email protected]>

lua/calltree/lsp/util.lua

@@ -1,4 +1,5 @@
 local tree_node = require('calltree.tree.node')
+local notify = require('calltree.ui.notify')
 local M = {}
 
 M.multi_client_request = function(clients, method, params, handler, bufnr)
@@ -199,10 +200,11 @@ function M.gather_symbols_async(root, children, ui_state, callback)
         table.insert(all_nodes, child)
     end
     co = coroutine.create(function()
-        for _, node in ipairs(all_nodes) do
+        for i, node in ipairs(all_nodes) do
             local params = {
                 query = node.name,
             }
+            notify.notify_popup("gathering symbols [" .. i .. "/" .. #all_nodes .. "]")
             M.multi_client_request(
                 ui_state.active_lsp_clients,
                 "workspace/symbol",
@@ -212,6 +214,7 @@ function M.gather_symbols_async(root, children, ui_state, callback)
                 ui_state.invoking_calltree_win
             )
             node.symbol = coroutine.yield()
+            notify.close_notify_popup()
         end
         callback()
     end)

lua/calltree/ui/notify.lua

@@ -0,0 +1,51 @@
+local M = {}
+
+local float_wins = {}
+
+function M.close_notify_popup()
+    for _, float_win in ipairs(float_wins) do
+        if vim.api.nvim_win_is_valid(float_win) then
+            vim.api.nvim_win_close(float_win, true)
+        end
+    end
+    float_wins = nil
+end
+
+function M.notify_popup(text)
+    if float_wins == nil then
+        float_wins = {}
+    end
+
+    local buf = vim.api.nvim_create_buf(false, true)
+    if buf == 0 then
+        vim.api.nvim_err_writeln("details_popup: could not create details buffer")
+        return
+    end
+    vim.api.nvim_buf_set_option(buf, 'bufhidden', 'delete')
+    vim.api.nvim_buf_set_option(buf, 'syntax', 'yaml')
+
+    local lines = {text}
+    local width = 20
+    local line_width = vim.fn.strdisplaywidth(text)
+    if line_width > width then
+        width = line_width
+    end
+
+    vim.api.nvim_buf_set_option(buf, 'modifiable', true)
+    vim.api.nvim_buf_set_lines(buf, 0, #lines, false, lines)
+    vim.api.nvim_buf_set_option(buf, 'modifiable', false)
+    local popup_conf = {
+        relative = "win",
+        anchor = "SE",
+        width = width,
+        height = 1,
+        focusable = false,
+        zindex = 99,
+        style = "minimal",
+        border = "rounded",
+        bufpos = {999999999, -1}
+    }
+    table.insert(float_wins, vim.api.nvim_open_win(buf, false, popup_conf))
+end
+
+return M