[feat] msys2 support

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = off

README.md

@@ -31,7 +31,7 @@ Plug 'sindrets/diffview.nvim'
 
 ```lua
 -- Packer
-use "sindrets/diffview.nvim" 
+use "sindrets/diffview.nvim"
 ```
 
 ## Merge Tool

lua/diffview/debounce.lua

@@ -243,4 +243,3 @@ function M.set_timeout(func, delay)
 end
 
 return M
-

lua/diffview/vcs/adapters/git/init.lua

@@ -25,6 +25,24 @@ local logger = DiffviewGlobal.logger
 local pl = lazy.access(utils, "path") ---@type PathLib
 local uv = vim.loop
 
+local has_cygpath
+local function normalize_cygwin_path(path)
+  if path and vim.fn.has('win32') == 1 and string.sub(path, 1, 1) == '/' then
+    if has_cygpath == nil then
+      has_cygpath = vim.fn.executable('cygpath') == 1
+    end
+
+    if has_cygpath then
+      path = vim.fn.system({"cygpath", "--absolute", "--windows", path})
+
+      -- remove "\n"
+      path = string.sub(path, 1, #path -1)
+    end
+  end
+
+  return path
+end
+
 local M = {}
 
 ---@class GitAdapter : VCSAdapter
@@ -177,7 +195,8 @@ local function get_toplevel(path)
   if code ~= 0 then
     return nil
   end
-  return out[1] and vim.trim(out[1])
+
+  return normalize_cygwin_path(out[1])
 end
 
 ---Try to find the top-level of a working tree by using the given indicative
@@ -279,7 +298,8 @@ function GitAdapter:get_dir(path)
   if code ~= 0 then
     return nil
   end
-  return out[1] and vim.trim(out[1])
+
+  return normalize_cygwin_path(out[1])
 end
 
 ---Verify that a given git rev is valid.