fix(vim.fs.normalize): normalize case for windows drive letter

Also add tests for the current path casing behavior so it doesn't get
accidentally changed.

1 files changed, 26 insertions, 0 deletions

diff --git a/test/functional/lua/fs_spec.lua b/test/functional/lua/fs_spec.lua
index 1c6ff5ac6d..218f9bbc46 100644
--- a/test/functional/lua/fs_spec.lua
+++ b/test/functional/lua/fs_spec.lua
@@ -340,6 +340,9 @@ describe('vim.fs', function()
   end)
 
   describe('normalize()', function()
+    -- local function vim.fs.normalize(path, opts)
+    --   return exec_lua([[return vim.fs.vim.fs.normalize(...)]], path, opts)
+    -- end
     it('removes trailing /', function()
       eq('/home/user', vim.fs.normalize('/home/user/'))
     end)
@@ -373,6 +376,29 @@ describe('vim.fs', function()
       eq('/foo/bar', vim.fs.normalize('/foo//bar////', posix_opts))
     end)
 
+    it('normalizes drive letter', function()
+      eq('C:/', vim.fs.normalize('C:/', win_opts))
+      eq('C:/', vim.fs.normalize('c:/', win_opts))
+      eq('D:/', vim.fs.normalize('d:/', win_opts))
+      eq('C:', vim.fs.normalize('C:', win_opts))
+      eq('C:', vim.fs.normalize('c:', win_opts))
+      eq('D:', vim.fs.normalize('d:', win_opts))
+      eq('C:/foo/test', vim.fs.normalize('C:/foo/test/', win_opts))
+      eq('C:/foo/test', vim.fs.normalize('c:/foo/test/', win_opts))
+      eq('D:foo/test', vim.fs.normalize('D:foo/test/', win_opts))
+      eq('D:foo/test', vim.fs.normalize('d:foo/test/', win_opts))
+    end)
+
+    it('does not change case on paths, see #31833', function()
+      eq('TEST', vim.fs.normalize('TEST', win_opts))
+      eq('test', vim.fs.normalize('test', win_opts))
+      eq('C:/FOO/test', vim.fs.normalize('C:/FOO/test', win_opts))
+      eq('C:/foo/test', vim.fs.normalize('C:/foo/test', win_opts))
+      eq('//SERVER/SHARE/FOO/BAR', vim.fs.normalize('//SERVER/SHARE/FOO/BAR', win_opts))
+      eq('//server/share/foo/bar', vim.fs.normalize('//server/share/foo/bar', win_opts))
+      eq('C:/FOO/test', vim.fs.normalize('c:/FOO/test', win_opts))
+    end)
+
     it('allows backslashes on unix-based os', function()
       eq('/home/user/hello\\world', vim.fs.normalize('/home/user/hello\\world', posix_opts))
     end)