Better logging (#6038) (#6095)

* Panic don't fatal on create new logger

Fixes #5854

Signed-off-by: Andrew Thornton <art27@cantab.net>

* partial broken

* Update the logging infrastrcture

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Reset the skip levels for Fatal and Error

Signed-off-by: Andrew Thornton <art27@cantab.net>

* broken ncsa

* More log.Error fixes

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove nal

* set log-levels to lowercase

* Make console_test test all levels

* switch to lowercased levels

* OK now working

* Fix vetting issues

* Fix lint

* Fix tests

* change default logging to match current gitea

* Improve log testing

Signed-off-by: Andrew Thornton <art27@cantab.net>

* reset error skip levels to 0

* Update documentation and access logger configuration

* Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE

* Fix broken level caching

* Refactor the router log

* Add Router logger

* Add colorizing options

* Adjust router colors

* Only create logger if they will be used

* update app.ini.sample

* rename Attribute ColorAttribute

* Change from white to green for function

* Set fatal/error levels

* Restore initial trace logger

* Fix Trace arguments in modules/auth/auth.go

* Properly handle XORMLogger

* Improve admin/config page

* fix fmt

* Add auto-compression of old logs

* Update error log levels

* Remove the unnecessary skip argument from Error, Fatal and Critical

* Add stacktrace support

* Fix tests

* Remove x/sync from vendors?

* Add stderr option to console logger

* Use filepath.ToSlash to protect against Windows in tests

* Remove prefixed underscores from names in colors.go

* Remove not implemented database logger

This was removed from Gogs on 4 Mar 2016 but left in the configuration
since then.

* Ensure that log paths are relative to ROOT_PATH

* use path.Join

* rename jsonConfig to logConfig

* Rename "config" to "jsonConfig" to make it clearer

* Requested changes

* Requested changes: XormLogger

* Try to color the windows terminal

If successful default to colorizing the console logs

* fixup

* Colorize initially too

* update vendor

* Colorize logs on default and remove if this is not a colorizing logger

* Fix documentation

* fix test

* Use go-isatty to detect if on windows we are on msys or cygwin

* Fix spelling mistake

* Add missing vendors

* More changes

* Rationalise the ANSI writer protection

* Adjust colors on advice from @0x5c

* Make Flags a comma separated list

* Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING

* Ensure matching is done on the non-colored message - to simpify EXPRESSION

1 files changed, 43 insertions, 0 deletions

diff --git a/modules/log/console_windows.go b/modules/log/console_windows.go
new file mode 100644
index 0000000000..61469aacf8
--- /dev/null
+++ b/modules/log/console_windows.go
@@ -0,0 +1,43 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package log
+
+import (
+	"os"
+
+	"github.com/mattn/go-isatty"
+	"golang.org/x/sys/windows"
+)
+
+func enableVTMode(console windows.Handle) bool {
+	mode := uint32(0)
+	err := windows.GetConsoleMode(console, &mode)
+	if err != nil {
+		return false
+	}
+
+	// EnableVirtualTerminalProcessing is the console mode to allow ANSI code
+	// interpretation on the console. See:
+	// https://docs.microsoft.com/en-us/windows/console/setconsolemode
+	// It only works on windows 10. Earlier terminals will fail with an err which we will
+	// handle to say don't color
+	mode = mode | windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
+	err = windows.SetConsoleMode(console, mode)
+	return err == nil
+}
+
+func init() {
+	if isatty.IsTerminal(os.Stdout.Fd()) {
+		CanColorStdout = enableVTMode(windows.Stdout)
+	} else {
+		CanColorStdout = isatty.IsCygwinTerminal(os.Stderr.Fd())
+	}
+
+	if isatty.IsTerminal(os.Stderr.Fd()) {
+		CanColorStderr = enableVTMode(windows.Stderr)
+	} else {
+		CanColorStderr = isatty.IsCygwinTerminal(os.Stderr.Fd())
+	}
+}