Merge #6827 'Always enable logging'

test/README.md

@@ -2,6 +2,8 @@
 
 Tests are run by `/cmake/RunTests.cmake` file, using busted.
 
+For some failures, `.nvimlog` (or `$NVIM_LOG_FILE`) may provide insight.
+
 ## Directory structure
 
 Directories with tests: `/test/benchmark` for benchmarks, `/test/functional` for 

test/functional/helpers.lua

@@ -174,7 +174,7 @@ local os_name = (function()
 end)()
 
 local function iswin()
-  return os_name() == 'windows'
+  return package.config:sub(1,1) == '\\'
 end
 
 -- Executes a VimL function.

test/functional/options/defaults_spec.lua

@@ -8,6 +8,8 @@ local clear = helpers.clear
 local eval = helpers.eval
 local eq = helpers.eq
 local neq = helpers.neq
+local mkdir = helpers.mkdir
+local rmdir = helpers.rmdir
 
 local function init_session(...)
   local args = { helpers.nvim_prog, '-i', 'NONE', '--embed',
@@ -121,6 +123,56 @@ describe('startup defaults', function()
   it('v:progpath is set to the absolute path', function()
     eq(eval("fnamemodify(v:progpath, ':p')"), eval('v:progpath'))
   end)
+
+  describe('$NVIM_LOG_FILE', function()
+    -- TODO(jkeyes): use stdpath('data') instead.
+    local datasubdir = helpers.iswin() and 'nvim-data' or 'nvim'
+    local xdgdir = 'Xtest-startup-xdg-logpath'
+    local xdgdatadir = xdgdir..'/'..datasubdir
+    after_each(function()
+      os.remove('Xtest-logpath')
+      rmdir(xdgdir)
+    end)
+
+    it('is used if expansion succeeds', function()
+      clear({env={
+        NVIM_LOG_FILE='Xtest-logpath',
+      }})
+      eq('Xtest-logpath', eval('$NVIM_LOG_FILE'))
+    end)
+    it('defaults to stdpath("data")/log if empty', function()
+      eq(true, mkdir(xdgdir) and mkdir(xdgdatadir))
+      clear({env={
+        XDG_DATA_HOME=xdgdir,
+        NVIM_LOG_FILE='',  -- Empty is invalid.
+      }})
+      -- server_start() calls ELOG, which tickles log_path_init().
+      pcall(command, 'call serverstart(serverlist()[0])')
+
+      eq(xdgdir..'/'..datasubdir..'/log', string.gsub(eval('$NVIM_LOG_FILE'), '\\', '/'))
+    end)
+    it('defaults to stdpath("data")/log if invalid', function()
+      eq(true, mkdir(xdgdir) and mkdir(xdgdatadir))
+      clear({env={
+        XDG_DATA_HOME=xdgdir,
+        NVIM_LOG_FILE='.',  -- Any directory is invalid.
+      }})
+      -- server_start() calls ELOG, which tickles log_path_init().
+      pcall(command, 'call serverstart(serverlist()[0])')
+
+      eq(xdgdir..'/'..datasubdir..'/log', string.gsub(eval('$NVIM_LOG_FILE'), '\\', '/'))
+    end)
+    it('defaults to .nvimlog if stdpath("data") is invalid', function()
+      clear({env={
+        XDG_DATA_HOME='Xtest-missing-xdg-dir',
+        NVIM_LOG_FILE='.',  -- Any directory is invalid.
+      }})
+      -- server_start() calls ELOG, which tickles log_path_init().
+      pcall(command, 'call serverstart(serverlist()[0])')
+
+      eq('.nvimlog', eval('$NVIM_LOG_FILE'))
+    end)
+  end)
 end)
 
 describe('XDG-based defaults', function()