feat(cmdline): enable in command-line-window and vim filetype

Enables cmdline source provider in the command-line window and vim
filetype. You can also add it to other filetypes, just like any other
source.

Note that if you already have `opts.sources.default` configured and want
this feature, simply add the `cmdline` source alongside your other
sources, or enable it specifically for the vim filetype with:

```lua
sources = {
    per_filetype = {
        vim = { 'cmdline' }
    },
}
```

Closes #1835
Related #1447

Author: soifou

doc/configuration/reference.md

@@ -461,8 +461,8 @@ See the [mode specific configurations](#mode-specific) for setting sources for `
 ```lua
 sources = {
   -- Static list of providers to enable, or a function to dynamically enable/disable providers based on the context
-  default = { 'lsp', 'path', 'snippets', 'buffer' },
-
+  default = { 'cmdline', 'lsp', 'path', 'snippets', 'buffer' },
+  
   -- You may also define providers per filetype
   per_filetype = {
     -- optionally inherit from the `default` sources

lua/blink/cmp/completion/windows/ghost_text/init.lua

@@ -69,7 +69,9 @@ function ghost_text.show_preview(items, selection_idx)
   ghost_text.selected_item = selected_item
 
   vim.api.nvim_set_decoration_provider(ghost_text.ns, {
-    on_win = function(_, _, buf) return utils.is_noice() and buf == ghost_text_buf end,
+    on_win = function(_, _, buf)
+      return (vim.fn.win_gettype() == 'command' or utils.is_noice()) and buf == ghost_text_buf
+    end,
     on_line = function() ghost_text.draw_preview() end,
   })
 

lua/blink/cmp/config/sources.lua

@@ -45,9 +45,8 @@ local validate = require('blink.cmp.config.utils').validate
 local sources = {
   --- @type blink.cmp.SourceConfig
   default = {
-    default = { 'lsp', 'path', 'snippets', 'buffer' },
+    default = { 'cmdline', 'lsp', 'path', 'snippets', 'buffer' },
     per_filetype = {},
-
     transform_items = function(_, items) return items end,
     min_keyword_length = 0,
 

lua/blink/cmp/lib/text_edits.lua

@@ -14,9 +14,10 @@ function text_edits.apply(text_edit, additional_text_edits)
   assert(mode == 'default' or mode == 'cmdline' or mode == 'term', 'Unsupported mode for text edits: ' .. mode)
 
   if mode == 'default' then
-    -- writing to dot repeat may fail in cases like `q:`, which aren't easy to detect
-    -- so we ignore the error
-    if config.completion.accept.dot_repeat then pcall(text_edits.write_to_dot_repeat, text_edit) end
+    -- writing to dot repeat may fail in cases like `q:`
+    if config.completion.accept.dot_repeat and vim.fn.win_gettype() ~= 'command' then
+      text_edits.write_to_dot_repeat(text_edit)
+    end
 
     local all_edits = utils.shallow_copy(additional_text_edits)
     table.insert(all_edits, text_edit)

lua/blink/cmp/sources/cmdline/init.lua

@@ -17,17 +17,18 @@ function cmdline.new()
   return self
 end
 
-function cmdline:enabled()
-  return vim.api.nvim_get_mode().mode == 'c' and vim.tbl_contains({ ':', '@' }, vim.fn.getcmdtype())
-end
-
 ---@param name string
 ---@return boolean?
 function cmdline:is_boolean_option(name)
   local ok, opt = pcall(function() return vim.opt[name]:get() end)
   if ok then return type(opt) == 'boolean' end
 end
 
+function cmdline:enabled()
+  return vim.bo.ft == 'vim'
+    or vim.api.nvim_get_mode().mode == 'c' and vim.tbl_contains({ ':', '@' }, vim.fn.getcmdtype())
+end
+
 function cmdline:get_trigger_characters() return { ' ', '.', '#', '-', '=', '/', ':' } end
 
 function cmdline:get_completions(context, callback)
@@ -48,6 +49,7 @@ function cmdline:get_completions(context, callback)
   local cmd = (valid_cmd and parsed.cmd) or arguments[1] or ''
 
   local is_help_command = constants.help_commands[cmd] and arg_number > 1
+  local is_cmdline = vim.api.nvim_get_mode().mode == 'c'
 
   local task = async.task
     .empty()
@@ -173,6 +175,19 @@ function cmdline:get_completions(context, callback)
           start_pos = start_pos + #prefix
         end
 
+        -- Adjust start position for Lua expressions entered without space
+        -- `=vim.api` which are valid expressions
+        if is_first_arg and not is_cmdline then
+          local prefix = current_arg:match('^=([^%s].*)')
+          if prefix then start_pos = start_pos + #prefix end
+        end
+
+        -- Calculate line and column values based on context
+        local line = is_cmdline and 0 or (context.cursor[1] - 1)
+        local insert_end_char = is_cmdline and (vim.fn.getcmdpos() - 1) or context.cursor[2]
+        local replace_end_char =
+          math.min(start_pos + #current_arg, context.bounds.start_col + context.bounds.length - 1)
+
         local item = {
           label = filter_text,
           filterText = filter_text,
@@ -181,15 +196,12 @@ function cmdline:get_completions(context, callback)
           textEdit = {
             newText = new_text,
             insert = {
-              start = { line = 0, character = start_pos },
-              ['end'] = { line = 0, character = vim.fn.getcmdpos() - 1 },
+              start = { line = line, character = start_pos },
+              ['end'] = { line = line, character = insert_end_char },
             },
             replace = {
-              start = { line = 0, character = start_pos },
-              ['end'] = {
-                line = 0,
-                character = math.min(start_pos + #current_arg, context.bounds.start_col + context.bounds.length - 1),
-              },
+              start = { line = line, character = start_pos },
+              ['end'] = { line = line, character = replace_end_char },
             },
           },
           kind = require('blink.cmp.types').CompletionItemKind.Property,