fix(runtime): respect 'fileignorecase' when sourcing (#24344)

2 files changed, 35 insertions, 0 deletions

diff --git a/test/functional/lua/runtime_spec.lua b/test/functional/lua/runtime_spec.lua
index 1f312fc513..0b8b2234db 100644
--- a/test/functional/lua/runtime_spec.lua
+++ b/test/functional/lua/runtime_spec.lua
@@ -177,6 +177,31 @@ describe('runtime:', function()
       exec('setfiletype new-ft')
       eq('ABCDEFabcdef', eval('g:seq'))
     end)
+
+    it("'rtp' order is respected with 'fileignorecase'", function()
+      exec('set fileignorecase')
+      local after_ftplugin_folder = table.concat({plug_dir, 'after', 'ftplugin'}, sep)
+      mkdir_p(table.concat({ftplugin_folder, 'new-ft'}, sep))
+      mkdir_p(table.concat({after_ftplugin_folder, 'new-ft'}, sep))
+      exec('set rtp+=' .. plug_dir .. '/after')
+      exec('let g:seq = ""')
+      -- A .lua file is loaded after a .vim file if they only differ in extension.
+      -- All files in after/ftplugin/ are loaded after all files in ftplugin/.
+      write_file(table.concat({ftplugin_folder, 'new-ft.VIM'}, sep), [[let g:seq ..= 'A']])
+      write_file(table.concat({ftplugin_folder, 'new-ft.LUA'}, sep), [[vim.g.seq = vim.g.seq .. 'B']])
+      write_file(table.concat({ftplugin_folder, 'new-ft_a.vim'}, sep), [[let g:seq ..= 'C']])
+      write_file(table.concat({ftplugin_folder, 'new-ft_a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'D']])
+      write_file(table.concat({ftplugin_folder, 'new-ft', 'a.VIM'}, sep), [[let g:seq ..= 'E']])
+      write_file(table.concat({ftplugin_folder, 'new-ft', 'a.LUA'}, sep), [[vim.g.seq = vim.g.seq .. 'F']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft.vim'}, sep), [[let g:seq ..= 'a']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'b']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft_a.VIM'}, sep), [[let g:seq ..= 'c']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft_a.LUA'}, sep), [[vim.g.seq = vim.g.seq .. 'd']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft', 'a.vim'}, sep), [[let g:seq ..= 'e']])
+      write_file(table.concat({after_ftplugin_folder, 'new-ft', 'a.lua'}, sep), [[vim.g.seq = vim.g.seq .. 'f']])
+      exec('setfiletype new-ft')
+      eq('ABCDEFabcdef', eval('g:seq'))
+    end)
   end)
 
   describe('indent', function()
diff --git a/test/unit/path_spec.lua b/test/unit/path_spec.lua
index 5808e2013a..f9ce1ff099 100644
--- a/test/unit/path_spec.lua
+++ b/test/unit/path_spec.lua
@@ -15,6 +15,7 @@ local mkdir = helpers.mkdir
 
 cimport('string.h')
 local cimp = cimport('./src/nvim/os/os.h', './src/nvim/path.h')
+local options = cimport('./src/nvim/option_defs.h')
 
 local length = 0
 local buffer = nil
@@ -636,6 +637,15 @@ describe('path.c', function()
       eq(false, path_with_extension('/some/path/file.vim', 'lua'))
       eq(false, path_with_extension('/some/path/file', 'lua'))
     end)
+
+    itp("respects 'fileignorecase' option", function()
+      options.p_fic = false
+      eq(false, path_with_extension('/some/path/file.VIM', 'vim'))
+      eq(false, path_with_extension('/some/path/file.LUA', 'lua'))
+      options.p_fic = true
+      eq(true, path_with_extension('/some/path/file.VIM', 'vim'))
+      eq(true, path_with_extension('/some/path/file.LUA', 'lua'))
+    end)
   end)
 
   describe('path_with_url', function()