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/charmbracelet/glamour/ansi/blockstack.go

@@ -0,0 +1,95 @@
+package ansi
+
+import (
+	"bytes"
+)
+
+// BlockStack is a stack of block elements, used to calculate the current
+// indentation & margin level during the rendering process.
+type BlockStack []BlockElement
+
+// Len returns the length of the stack.
+func (s *BlockStack) Len() int {
+	return len(*s)
+}
+
+// Push appends an item to the stack.
+func (s *BlockStack) Push(e BlockElement) {
+	*s = append(*s, e)
+}
+
+// Pop removes the last item on the stack.
+func (s *BlockStack) Pop() {
+	stack := *s
+	if len(stack) == 0 {
+		return
+	}
+
+	stack = stack[0 : len(stack)-1]
+	*s = stack
+}
+
+// Indent returns the current indentation level of all elements in the stack.
+func (s BlockStack) Indent() uint {
+	var i uint
+
+	for _, v := range s {
+		if v.Style.Indent == nil {
+			continue
+		}
+		i += *v.Style.Indent
+	}
+
+	return i
+}
+
+// Margin returns the current margin level of all elements in the stack.
+func (s BlockStack) Margin() uint {
+	var i uint
+
+	for _, v := range s {
+		if v.Style.Margin == nil {
+			continue
+		}
+		i += *v.Style.Margin
+	}
+
+	return i
+}
+
+// Width returns the available rendering width
+func (s BlockStack) Width(ctx RenderContext) uint {
+	if s.Indent()+s.Margin()*2 > uint(ctx.options.WordWrap) {
+		return 0
+	}
+	return uint(ctx.options.WordWrap) - s.Indent() - s.Margin()*2
+}
+
+// Parent returns the current BlockElement's parent.
+func (s BlockStack) Parent() BlockElement {
+	if len(s) == 1 {
+		return BlockElement{
+			Block: &bytes.Buffer{},
+		}
+	}
+
+	return s[len(s)-2]
+}
+
+// Current returns the current BlockElement.
+func (s BlockStack) Current() BlockElement {
+	if len(s) == 0 {
+		return BlockElement{
+			Block: &bytes.Buffer{},
+		}
+	}
+
+	return s[len(s)-1]
+}
+
+// With returns a StylePrimitive that inherits the current BlockElement's style.
+func (s BlockStack) With(child StylePrimitive) StylePrimitive {
+	sb := StyleBlock{}
+	sb.StylePrimitive = child
+	return cascadeStyle(s.Current().Style, sb, false).StylePrimitive
+}