feat(ui): add setting to customize window border (#754)

Closes #752.

6 files changed, 17 insertions, 6 deletions

diff --git a/README.md b/README.md
index 0addc0e9..cf43431c 100644
--- a/README.md
+++ b/README.md
@@ -335,6 +335,9 @@ local DEFAULT_SETTINGS = {
         -- Whether to automatically check for outdated servers when opening the UI window.
         check_outdated_servers_on_open = true,
 
+        -- The border to use for the UI window. Accepts same border values as |nvim_open_win()|.
+        border = "none",
+
         icons = {
             -- The list icon to use for installed servers.
             server_installed = "◍",
diff --git a/doc/nvim-lsp-installer.txt b/doc/nvim-lsp-installer.txt
index a2c2b01a..20ee2945 100644
--- a/doc/nvim-lsp-installer.txt
+++ b/doc/nvim-lsp-installer.txt
@@ -185,6 +185,9 @@ The following settings are applied by default.
             -- Whether to automatically check for outdated servers when opening the UI window.
             check_outdated_servers_on_open = true,
 
+            -- The border to use for the UI window. Accepts same border values as |nvim_open_win()|.
+            border = "none",
+
             icons = {
                 -- The list icon to use for installed servers.
                 server_installed = "◍",
diff --git a/lua/nvim-lsp-installer.lua b/lua/nvim-lsp-installer.lua
index 1643f3e8..5540369c 100644
--- a/lua/nvim-lsp-installer.lua
+++ b/lua/nvim-lsp-installer.lua
@@ -30,7 +30,7 @@ local function ensure_installed(server_identifiers)
     end
 end
 
----@param config table
+---@param config LspInstallerSettings
 function M.setup(config)
     if config then
         settings.set(config)
diff --git a/lua/nvim-lsp-installer/core/ui/display.lua b/lua/nvim-lsp-installer/core/ui/display.lua
index b7c60c28..5e4618f5 100644
--- a/lua/nvim-lsp-installer/core/ui/display.lua
+++ b/lua/nvim-lsp-installer/core/ui/display.lua
@@ -141,8 +141,9 @@ end
 -- exported for tests
 M._render_node = render_node
 
+---@param opts DisplayOpenOpts
 ---@param sizes_only boolean @Whether to only return properties that control the window size.
-local function create_popup_window_opts(sizes_only)
+local function create_popup_window_opts(opts, sizes_only)
     local win_height = vim.o.lines - vim.o.cmdheight - 2 -- Add margin for status and buffer line
     local win_width = vim.o.columns
     local height = math.floor(win_height * 0.9)
@@ -158,7 +159,7 @@ local function create_popup_window_opts(sizes_only)
     }
 
     if not sizes_only then
-        popup_layout.border = "none"
+        popup_layout.border = opts.border
     end
 
     return popup_layout
@@ -303,7 +304,7 @@ function M.new_view_only_win(name)
         opts = opts or {}
         local highlight_groups = opts.highlight_groups
         bufnr = vim.api.nvim_create_buf(false, true)
-        win_id = vim.api.nvim_open_win(bufnr, true, create_popup_window_opts(false))
+        win_id = vim.api.nvim_open_win(bufnr, true, create_popup_window_opts(opts, false))
 
         registered_effect_handlers = opts.effects
         registered_keybinds = {}
@@ -352,7 +353,7 @@ function M.new_view_only_win(name)
             callback = function()
                 if vim.api.nvim_win_is_valid(win_id) then
                     draw(renderer(get_state()))
-                    vim.api.nvim_win_set_config(win_id, create_popup_window_opts(true))
+                    vim.api.nvim_win_set_config(win_id, create_popup_window_opts(opts, true))
                 end
             end,
         })
@@ -419,7 +420,7 @@ function M.new_view_only_win(name)
 
             return mutate_state, get_state
         end,
-        ---@alias DisplayOpenOpts {effects: table<string, fun()>, highlight_groups: string[]|nil}
+        ---@alias DisplayOpenOpts {effects: table<string, fun()>, highlight_groups: string[]|nil, border: string|table}
         ---@type fun(opts: DisplayOpenOpts)
         open = vim.schedule_wrap(function(opts)
             log.trace "Opening window"
diff --git a/lua/nvim-lsp-installer/settings.lua b/lua/nvim-lsp-installer/settings.lua
index a0641480..d84b60af 100644
--- a/lua/nvim-lsp-installer/settings.lua
+++ b/lua/nvim-lsp-installer/settings.lua
@@ -21,6 +21,9 @@ local DEFAULT_SETTINGS = {
         -- Whether to automatically check for outdated servers when opening the UI window.
         check_outdated_servers_on_open = true,
 
+        -- The border to use for the UI window. Accepts same border values as |nvim_open_win()|.
+        border = "none",
+
         icons = {
             -- The list icon to use for installed servers.
             server_installed = "◍",
diff --git a/lua/nvim-lsp-installer/ui/init.lua b/lua/nvim-lsp-installer/ui/init.lua
index 32f420ac..fc063ff2 100644
--- a/lua/nvim-lsp-installer/ui/init.lua
+++ b/lua/nvim-lsp-installer/ui/init.lua
@@ -968,6 +968,7 @@ local function init(all_servers)
         end
 
         window.open {
+            border = settings.current.ui.border,
             highlight_groups = {
                 "hi def LspInstallerHeader gui=bold guifg=#222222 guibg=#DCA561",
                 "hi def LspInstallerHeaderHelp gui=bold guifg=#222222 guibg=#56B6C2",