Add fd_opts option to list command

By passing various options, it is possible to accommodate a wider
variety of needs and configurations. An example is given in the
corresponding documentation in the README.

Author: cljoly

README.md

@@ -95,7 +95,7 @@ use {
 
 ### list
 
-`:Telescope repo list`
+`:Telescope repo list` or `lua require'telescope'.extensions.repo.list{}`
 
 Running `repo list` and list repositories' paths.
 
@@ -126,6 +126,28 @@ Transform the result paths into relative ones with this value as the base dir.
 
 Default value: `vim.fn.getcwd()`
 
+#### `fd_opts`
+
+**This is a relatively advanced option that you should use with caution. There is no guarantee that a particular set of options would work the same across multiple versions**
+
+This passes additional options to the command `fd` that generates the repository list. It is inserted like so:
+
+```
+fd [set of default options] [fd_opts] --exec [some default command] [pattern] …
+```
+
+##### Example
+
+Let’s say you have a git repository `S` inside another git repository `M` (for instance because of [#5](https://github.com/cljoly/telescope-repo.nvim/issues/5)), but `S` is in a directory that’s ignored in the `.gitignore` in `M`. `S` wouldn’t appear in the Telescope list of this extension by default, because it is ignored (`.gitignore` are taken into account by default).
+
+To avoid taking into account the `.gitignore`, we need to pass `--no-ignore-vcs` to `fd`, like so (in NeoVim):
+
+```
+:lua require'telescope'.extensions.repo.list{fd_opts={'--no-ignore-vcs'}}
+```
+
+This will list `M` and `S` in the Telescope output! The downside is that listing repositories will be a little longer, as we don’t skip the git-ignored files anymore.
+
 ##### `tail_path`
 
 Show only basename of the path.

lua/telescope/_extensions/repo_builtin.lua

@@ -91,9 +91,15 @@ M.list = function(opts)
 
   -- Don’t filter only on directories with fd as git worktrees actually have a
   -- .git file in them.
-  local find_repo_opts = {'--hidden', '--case-sensitive', '--absolute-path', '--exec', 'echo', [[{//}]], ';', repo_pattern}
+  local find_repo_opts = {'--hidden', '--case-sensitive', '--absolute-path'}
+  local find_user_opts = opts.fd_opts or {}
+  local find_exec_opts = {'--exec', 'echo', [[{//}]], ';'}
+  local find_pattern_opts = {repo_pattern}
 
   table.insert(fd_command, find_repo_opts)
+  table.insert(fd_command, find_user_opts)
+  table.insert(fd_command, find_exec_opts)
+  table.insert(fd_command, find_pattern_opts)
   fd_command = vim.tbl_flatten(fd_command)
 
   pickers.new(opts, {