lualine.nvim/lua/lualine/components/branch.lua

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-- Copyright (c) 2020-2021 shadmansaleh
-- MIT license, see LICENSE for more details.
local Branch = require('lualine.component'):new()
-- vars
Branch.git_branch = ''
Branch.git_dir = ''
-- os specific path separator
Branch.sep = package.config:sub(1, 1)
-- event watcher to watch head file
-- Use file wstch for non windows and poll for windows.
-- windows doesn't like file watch for some reason.
Branch.file_changed = Branch.sep ~= '\\' and vim.loop.new_fs_event() or vim.loop.new_fs_poll()
Branch.active_bufnr = '0'
local branch_cache = {} -- stores last known branch for a buffer
-- Initilizer
Branch.new = function(self, options, child)
local new_branch = self._parent:new(options, child or Branch)
if not new_branch.options.icon then
new_branch.options.icon = '' -- e0a0
end
-- run watch head on load so branch is present when component is loaded
Branch.find_git_dir()
return new_branch
end
Branch.update_status = function(_, is_focused)
if Branch.active_bufnr ~= vim.g.actual_curbuf then
-- Sync buffer
Branch.find_git_dir()
end
if not is_focused then
return branch_cache[vim.fn.bufnr()] or ''
end
return Branch.git_branch
end
local git_dir_cache = {} -- Stores git paths that we already know of
-- returns full path to git directory for current directory
function Branch.find_git_dir()
-- get file dir so we can search from that dir
local file_dir = vim.fn.expand '%:p:h'
local root_dir = file_dir
local git_dir
-- Search upward for .git file or folder
while root_dir do
if git_dir_cache[root_dir] then
git_dir = git_dir_cache[root_dir]
break
end
local git_path = root_dir .. Branch.sep .. '.git'
local git_file_stat = vim.loop.fs_stat(git_path)
if git_file_stat then
if git_file_stat.type == 'directory' then
git_dir = git_path
elseif git_file_stat.type == 'file' then
-- separate git-dir or submodule is used
local file = io.open(git_path)
git_dir = file:read()
git_dir = git_dir:match 'gitdir: (.+)$'
file:close()
-- submodule / relative file path
if git_dir and git_dir:sub(1, 1) ~= Branch.sep and not git_dir:match '^%a:.*$' then
git_dir = git_path:match '(.*).git' .. git_dir
end
end
if git_dir then
local head_file_stat = vim.loop.fs_stat(git_dir .. Branch.sep .. 'HEAD')
if head_file_stat and head_file_stat.type == 'file' then
break
else
git_dir = nil
end
end
end
root_dir = root_dir:match('(.*)' .. Branch.sep .. '.-')
end
git_dir_cache[file_dir] = git_dir
if Branch.git_dir ~= git_dir then
Branch.git_dir = git_dir
Branch.update_branch()
end
return git_dir
end
-- sets git_branch veriable to branch name or commit hash if not on branch
function Branch.get_git_head(head_file)
local f_head = io.open(head_file)
if f_head then
local HEAD = f_head:read()
f_head:close()
local branch = HEAD:match 'ref: refs/heads/(.+)$'
if branch then
Branch.git_branch = branch
else
Branch.git_branch = HEAD:sub(1, 6)
end
end
return nil
end
-- Update branch
function Branch.update_branch()
Branch.active_bufnr = tostring(vim.fn.bufnr())
Branch.file_changed:stop()
local git_dir = Branch.git_dir
if git_dir and #git_dir > 0 then
local head_file = git_dir .. Branch.sep .. 'HEAD'
Branch.get_git_head(head_file)
Branch.file_changed:start(
head_file,
Branch.sep ~= '\\' and {} or 1000,
vim.schedule_wrap(function()
-- reset file-watch
Branch.update_branch()
end)
)
else
-- set to '' when git dir was not found
Branch.git_branch = ''
end
branch_cache[vim.fn.bufnr()] = Branch.git_branch
end
return Branch