feat(context): add full file content support for files

The files context provider now supports two modes:
- 'list' (default) - includes only filenames in the workspace
- 'full' - includes both filenames and their content

This change provides more flexibility when needing full context from workspace
files. The implementation also adds proper filetype detection and filtering
for files to ensure only text files are included.

Closes CopilotC-Nvim#360

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Author: deathbeam

README.md

@@ -275,7 +275,7 @@ Default contexts are:
 - `buffer` - Includes specified buffer in chat context (default current). Supports input.
 - `buffers` - Includes all buffers in chat context (default listed). Supports input.
 - `file` - Includes content of provided file in chat context. Supports input.
-- `files` - Includes all non-hidden filenames in the current workspace in chat context.
+- `files` - Includes all non-hidden files in the current workspace in chat context. By default includes only filenames, includes also content with `full` input. Including all content can be slow on big workspaces so use with care. Supports input.
 - `git` - Includes current git diff in chat context (default unstaged). Supports input.
 - `register` - Includes content of specified register in chat context (default `+`, e.g system clipboard). Supports input.
 
@@ -719,7 +719,7 @@ require('CopilotChat').setup({
 
 ## Roadmap (Wishlist)
 
-- Use indexed vector database with current workspace for better context selection
+- Caching for contexts
 - General QOL improvements
 
 ## Development

lua/CopilotChat/config.lua

@@ -228,9 +228,14 @@ return {
       end,
     },
     files = {
-      description = 'Includes all non-hidden filenames in the current workspace in chat context.',
-      resolve = function(_, source)
-        return context.files(source.winnr)
+      description = 'Includes all non-hidden files in the current workspace in chat context. By default includes only filenames, includes also content with `full` input. Including all content can be slow on big workspaces so use with care. Supports input.',
+      input = function(callback)
+        vim.ui.select({ 'list', 'full' }, {
+          prompt = 'Select files content> ',
+        }, callback)
+      end,
+      resolve = function(input, source)
+        return context.files(source.winnr, input == 'full')
       end,
     },
     git = {

lua/CopilotChat/context.lua

@@ -276,8 +276,9 @@ end
 
 --- Get list of all files in workspace
 ---@param winnr number?
+---@param with_content boolean?
 ---@return table<CopilotChat.copilot.embed>
-function M.files(winnr)
+function M.files(winnr, with_content)
   local cwd = utils.win_cwd(winnr)
   local files = utils.scan_dir(cwd, {
     add_dirs = false,
@@ -286,7 +287,35 @@ function M.files(winnr)
 
   local out = {}
 
-  -- Create embeddings in chunks
+  -- Read all files if we want content as well
+  if with_content then
+    async.util.scheduler()
+
+    files = vim.tbl_map(function(file)
+      return {
+        name = utils.filepath(file),
+        ft = utils.filetype(file),
+      }
+    end, files)
+    files = vim.tbl_filter(function(file)
+      return file.ft ~= nil
+    end, files)
+
+    for _, file in ipairs(files) do
+      local content = utils.read_file(file.name)
+      if content then
+        table.insert(out, {
+          content = content,
+          filename = file.name,
+          filetype = file.ft,
+        })
+      end
+    end
+
+    return out
+  end
+
+  -- Create file list in chunks
   local chunk_size = 100
   for i = 1, #files, chunk_size do
     local chunk = {}
@@ -317,10 +346,14 @@ function M.file(filename)
   end
 
   async.util.scheduler()
+  if not utils.filetype(filename) then
+    return nil
+  end
+
   return {
     content = content,
-    filename = vim.fn.fnamemodify(filename, ':p:.'),
-    filetype = vim.filetype.match({ filename = filename }),
+    filename = utils.filepath(filename),
+    filetype = utils.filetype(filename),
   }
 end
 
@@ -341,7 +374,7 @@ function M.buffer(bufnr)
 
   return {
     content = table.concat(content, '\n'),
-    filename = vim.fn.fnamemodify(vim.api.nvim_buf_get_name(bufnr), ':p:.'),
+    filename = utils.filepath(vim.api.nvim_buf_get_name(bufnr)),
     filetype = vim.bo[bufnr].filetype,
   }
 end

lua/CopilotChat/copilot.lua

@@ -329,9 +329,7 @@ local Copilot = class(function(self, proxy, allow_insecure)
       '60',
       -- Disable compression (since responses are already streamed efficiently)
       '--no-compressed',
-      -- Important timeouts
-      '--max-time',
-      math.floor(TIMEOUT * 2 / 1000),
+      -- Connect timeout of 10 seconds
       '--connect-timeout',
       '10',
       -- Streaming optimizations

lua/CopilotChat/utils.lua

@@ -180,6 +180,24 @@ function M.filename_same(file1, file2)
   return vim.fn.fnamemodify(file1, ':p') == vim.fn.fnamemodify(file2, ':p')
 end
 
+--- Get the filetype of a file
+---@param filename string The file name
+---@return string|nil
+function M.filetype(filename)
+  local ft = vim.filetype.match({ filename = filename })
+  if ft == '' then
+    return nil
+  end
+  return ft
+end
+
+--- Get the file path
+---@param filename string The file name
+---@return string
+function M.filepath(filename)
+  return vim.fn.fnamemodify(filename, ':p:.')
+end
+
 --- Generate a UUID
 ---@return string
 function M.uuid()