feat(renderer): set git icons in signcolumn

doc/nvim-tree-lua.txt

@@ -432,7 +432,10 @@ UI rendering setup
 	*nvim-tree.renderer.icons.git_placement*
 	Place where the git icons will be rendered.
 	After or before the `filename` (after the file/folders icons).
-	  Type: `after` or `before`, Default: `before`
+	When placed in the signcolumn, the value of signcolumn should be `yes`
+	for the nvim-tree window.
+	Note that the diagnostic signs will take precedence over the git signs.
+	  Type: `after`, `before` or `signcolumn`, Default: `before`
 
 *nvim-tree.filters*
 Filtering options.

lua/nvim-tree/diagnostics.lua

@@ -32,7 +32,7 @@ local function add_sign(linenr, severity)
     return
   end
   local sign_name = sign_names[severity][1]
-  vim.fn.sign_place(1, GROUP, sign_name, buf, { lnum = linenr })
+  vim.fn.sign_place(0, GROUP, sign_name, buf, { lnum = linenr, priority = 2 })
 end
 
 local function from_nvim_lsp()

lua/nvim-tree/renderer/builder.lua

@@ -14,6 +14,7 @@ function Builder.new(root_cwd)
     highlights = {},
     lines = {},
     markers = {},
+    signs = {},
     root_cwd = root_cwd,
   }, Builder)
 end
@@ -61,9 +62,11 @@ function Builder:configure_git_icons_padding(padding)
 end
 
 function Builder:configure_git_icons_placement(where)
-  where = where or "before"
-  self.is_git_before = where == "before"
-  self.is_git_after = not self.is_git_before
+  if where == "signcolumn" then
+    vim.fn.sign_unplace(git.SIGN_GROUP)
+    self.is_git_sign = true
+  end
+  self.is_git_after = where == "after" and not self.is_git_sign
   return self
 end
 
@@ -109,7 +112,7 @@ function Builder:_build_folder(node, padding, git_hl, git_icons_tbl)
 
   local foldername = name .. self.trailing_slash
   local git_icons = self:_unwrap_git_data(git_icons_tbl, offset + #icon + (self.is_git_after and #foldername + 1 or 0))
-  local fname_starts_at = offset + #icon + (self.is_git_before and #git_icons or 0)
+  local fname_starts_at = offset + #icon + (self.is_git_after and 0 or #git_icons)
   local line = self:_format_line(padding .. icon, foldername, git_icons)
   self:_insert_line(line)
 
@@ -226,6 +229,12 @@ function Builder:_build_line(tree, node, idx)
   local git_highlight = git.get_highlight(node)
   local git_icons_tbl = git.get_icons(node)
 
+  if self.is_git_sign and git_icons_tbl and #git_icons_tbl > 0 then
+    local git_info = git_icons_tbl[1]
+    table.insert(self.signs, { sign = git_info.hl, lnum = self.index + 1 })
+    git_icons_tbl = {}
+  end
+
   local is_folder = node.nodes ~= nil
   local is_symlink = node.link_to ~= nil
 
@@ -270,7 +279,7 @@ function Builder:build_header(show_header)
 end
 
 function Builder:unwrap()
-  return self.lines, self.highlights
+  return self.lines, self.highlights, self.signs
 end
 
 return Builder

lua/nvim-tree/renderer/components/git.lua

@@ -1,7 +1,9 @@
 local _icons = require "nvim-tree.renderer.icon-config"
 local utils = require "nvim-tree.utils"
 
-local M = {}
+local M = {
+  SIGN_GROUP = "NvimTreeGitSigns",
+}
 
 local function build_icons_table()
   local i = M.icon_state.icons.git_icons
@@ -124,6 +126,17 @@ local git_hl = {
   [" A"] = "none",
 }
 
+function M.setup_signs()
+  local i = M.icon_state.icons.git_icons
+  vim.fn.sign_define("NvimTreeGitDirty", { text = i.unstaged, texthl = "NvimTreeGitDirty" })
+  vim.fn.sign_define("NvimTreeGitStaged", { text = i.staged, texthl = "NvimTreeGitStaged" })
+  vim.fn.sign_define("NvimTreeGitMerge", { text = i.unmerged, texthl = "NvimTreeGitMerge" })
+  vim.fn.sign_define("NvimTreeGitRenamed", { text = i.renamed, texthl = "NvimTreeGitRenamed" })
+  vim.fn.sign_define("NvimTreeGitNew", { text = i.untracked, texthl = "NvimTreeGitNew" })
+  vim.fn.sign_define("NvimTreeGitDeleted", { text = i.deleted, texthl = "NvimTreeGitDeleted" })
+  vim.fn.sign_define("NvimTreeGitIgnored", { text = i.ignored, texthl = "NvimTreeGitIgnored" })
+end
+
 local function get_highlight_(node)
   local git_status = node.git_status
   if not git_status then

lua/nvim-tree/renderer/init.lua

@@ -17,11 +17,14 @@ local M = {
 
 local namespace_id = api.nvim_create_namespace "NvimTreeHighlights"
 
-local function _draw(bufnr, lines, hl)
+local function _draw(bufnr, lines, hl, signs)
   api.nvim_buf_set_option(bufnr, "modifiable", true)
   api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
   M.render_hl(bufnr, hl)
   api.nvim_buf_set_option(bufnr, "modifiable", false)
+  for _, sign in pairs(signs) do
+    vim.fn.sign_place(0, git.SIGN_GROUP, sign.sign, bufnr, { lnum = sign.lnum, priority = 1 })
+  end
 end
 
 function M.render_hl(bufnr, hl)
@@ -71,10 +74,11 @@ function M.draw()
   git.reload()
 
   local lines, hl
+  local signs = {}
   if view.is_help_ui() then
     lines, hl = help.compute_lines()
   else
-    lines, hl = Builder.new(core.get_cwd())
+    lines, hl, signs = Builder.new(core.get_cwd())
       :configure_initial_depth(should_show_arrows())
       :configure_root_modifier(vim.g.nvim_tree_root_folder_modifier)
       :configure_trailing_slash(vim.g.nvim_tree_add_trailing == 1)
@@ -88,7 +92,8 @@ function M.draw()
       :unwrap()
   end
 
-  _draw(bufnr, lines, hl)
+  _draw(bufnr, lines, hl, signs)
+
   M.last_highlights = hl
 
   if cursor and #lines >= cursor[1] then
@@ -111,6 +116,7 @@ function M.setup(opts)
   }
 
   _padding.setup(opts)
+  git.setup_signs()
 end
 
 return M