feat: handle emptiness in views

Author: igorlfs

lua/dap-view/breakpoints/view.lua

@@ -4,6 +4,7 @@ local globals = require("dap-view.globals")
 local vendor = require("dap-view.breakpoints.vendor")
 local extmarks = require("dap-view.exceptions.util.extmarks")
 local treesitter = require("dap-view.exceptions.util.treesitter")
+local views = require("dap-view.views")
 
 local api = vim.api
 
@@ -56,13 +57,14 @@ local populate_buf_with_breakpoints = function()
         -- Clear previous content
         api.nvim_buf_set_lines(state.bufnr, 0, -1, true, {})
 
-        -- TODO: decide between getting breakpoints
-        -- (A) by getting placed signs (nvim-dap approach)
-        -- (B) by listing breakpoints via QuickFix list (might have some issues if using the qflist for something else)
         local breakpoints = vendor.get()
 
         local line_count = 0
 
+        if views.cleanup_view(vim.tbl_isempty(breakpoints), "No Breakpoints") then
+            return
+        end
+
         for buf, buf_entries in pairs(breakpoints) do
             local filename = api.nvim_buf_get_name(buf)
             local relative_path = vim.fn.fnamemodify(filename, ":.")

lua/dap-view/views/init.lua

@@ -0,0 +1,29 @@
+local state = require("dap-view.state")
+local globals = require("dap-view.globals")
+
+local M = {}
+
+local api = vim.api
+
+---@param cond boolean
+---@param message string
+M.cleanup_view = function(cond, message)
+    if cond then
+        vim.wo[state.winnr].cursorline = false
+
+        api.nvim_buf_set_lines(state.bufnr, 0, -1, false, { message })
+        api.nvim_buf_set_extmark(
+            state.bufnr,
+            globals.NAMESPACE,
+            0,
+            0,
+            { end_col = #message, hl_group = "DapBreakpoint" }
+        )
+    else
+        vim.wo[state.winnr].cursorline = true
+    end
+
+    return cond
+end
+
+return M

lua/dap-view/watches/view.lua

@@ -1,6 +1,7 @@
 local state = require("dap-view.state")
 local winbar = require("dap-view.options.winbar")
 local globals = require("dap-view.globals")
+local views = require("dap-view.views")
 
 local M = {}
 
@@ -14,7 +15,7 @@ M.show = function()
         api.nvim_buf_set_lines(state.bufnr, 0, -1, true, {})
         api.nvim_buf_clear_namespace(state.bufnr, globals.NAMESPACE, 0, -1)
 
-        if #state.watched_expressions == 0 then
+        if views.cleanup_view(#state.watched_expressions == 0, "No Expressions") then
             return
         end