Use glamour and termev to render/colorize content (#181)

Merge branch 'master' into use-glamour

select Glamour Theme based on BackgroundColor

Merge branch 'master' into use-glamour

Merge branch 'master' into use-glamour

update termev

update go.mod

label color colorate

use glamour for issue content

Vendor: Add glamour

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/181
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/github.com/muesli/termenv/termenv.go

@@ -0,0 +1,92 @@
+package termenv
+
+import (
+	"errors"
+	"os"
+
+	"github.com/mattn/go-isatty"
+)
+
+var (
+	ErrStatusReport = errors.New("unable to retrieve status report")
+)
+
+type Profile int
+
+const (
+	CSI = "\x1b["
+
+	Ascii = Profile(iota)
+	ANSI
+	ANSI256
+	TrueColor
+)
+
+// ColorProfile returns the supported color profile:
+// Ascii, ANSI, ANSI256, or TrueColor.
+func ColorProfile() Profile {
+	if !isatty.IsTerminal(os.Stdout.Fd()) {
+		return Ascii
+	}
+
+	return colorProfile()
+}
+
+// ForegroundColor returns the terminal's default foreground color.
+func ForegroundColor() Color {
+	if !isatty.IsTerminal(os.Stdout.Fd()) {
+		return NoColor{}
+	}
+
+	return foregroundColor()
+}
+
+// BackgroundColor returns the terminal's default background color.
+func BackgroundColor() Color {
+	if !isatty.IsTerminal(os.Stdout.Fd()) {
+		return NoColor{}
+	}
+
+	return backgroundColor()
+}
+
+// HasDarkBackground returns whether terminal uses a dark-ish background.
+func HasDarkBackground() bool {
+	c := ConvertToRGB(BackgroundColor())
+	_, _, l := c.Hsl()
+	return l < 0.5
+}
+
+// EnvNoColor returns true if the environment variables explicitly disable color output
+// by setting NO_COLOR (https://no-color.org/)
+// or CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
+// If NO_COLOR is set, this will return true, ignoring CLICOLOR/CLICOLOR_FORCE
+// If CLICOLOR=="0", it will be true only if CLICOLOR_FORCE is also "0" or is unset.
+func EnvNoColor() bool {
+	return os.Getenv("NO_COLOR") != "" || (os.Getenv("CLICOLOR") == "0" && !cliColorForced())
+}
+
+// EnvColorProfile returns the color profile based on environment variables set
+// Supports NO_COLOR (https://no-color.org/)
+// and CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
+// If none of these environment variables are set, this behaves the same as ColorProfile()
+// It will return the Ascii color profile if EnvNoColor() returns true
+// If the terminal does not support any colors, but CLICOLOR_FORCE is set and not "0"
+// then the ANSI color profile will be returned.
+func EnvColorProfile() Profile {
+	if EnvNoColor() {
+		return Ascii
+	}
+	p := ColorProfile()
+	if cliColorForced() && p == Ascii {
+		return ANSI
+	}
+	return p
+}
+
+func cliColorForced() bool {
+	if forced := os.Getenv("CLICOLOR_FORCE"); forced != "" {
+		return forced != "0"
+	}
+	return false
+}