TUN-3201: Create base cloudflared UI structure

vendor/github.com/gdamore/tcell/runes.go

@@ -0,0 +1,111 @@
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+// The names of these constants are chosen to match Terminfo names,
+// modulo case, and changing the prefix from ACS_ to Rune.  These are
+// the runes we provide extra special handling for, with ASCII fallbacks
+// for terminals that lack them.
+const (
+	RuneSterling = '£'
+	RuneDArrow   = '↓'
+	RuneLArrow   = '←'
+	RuneRArrow   = '→'
+	RuneUArrow   = '↑'
+	RuneBullet   = '·'
+	RuneBoard    = '░'
+	RuneCkBoard  = '▒'
+	RuneDegree   = '°'
+	RuneDiamond  = '◆'
+	RuneGEqual   = '≥'
+	RunePi       = 'π'
+	RuneHLine    = '─'
+	RuneLantern  = '§'
+	RunePlus     = '┼'
+	RuneLEqual   = '≤'
+	RuneLLCorner = '└'
+	RuneLRCorner = '┘'
+	RuneNEqual   = '≠'
+	RunePlMinus  = '±'
+	RuneS1       = '⎺'
+	RuneS3       = '⎻'
+	RuneS7       = '⎼'
+	RuneS9       = '⎽'
+	RuneBlock    = '█'
+	RuneTTee     = '┬'
+	RuneRTee     = '┤'
+	RuneLTee     = '├'
+	RuneBTee     = '┴'
+	RuneULCorner = '┌'
+	RuneURCorner = '┐'
+	RuneVLine    = '│'
+)
+
+// RuneFallbacks is the default map of fallback strings that will be
+// used to replace a rune when no other more appropriate transformation
+// is available, and the rune cannot be displayed directly.
+//
+// New entries may be added to this map over time, as it becomes clear
+// that such is desirable.  Characters that represent either letters or
+// numbers should not be added to this list unless it is certain that
+// the meaning will still convey unambiguously.
+//
+// As an example, it would be appropriate to add an ASCII mapping for
+// the full width form of the letter 'A', but it would not be appropriate
+// to do so a glyph representing the country China.
+//
+// Programs that desire richer fallbacks may register additional ones,
+// or change or even remove these mappings with Screen.RegisterRuneFallback
+// Screen.UnregisterRuneFallback methods.
+//
+// Note that Unicode is presumed to be able to display all glyphs.
+// This is a pretty poor assumption, but there is no easy way to
+// figure out which glyphs are supported in a given font.  Hence,
+// some care in selecting the characters you support in your application
+// is still appropriate.
+var RuneFallbacks = map[rune]string{
+	RuneSterling: "f",
+	RuneDArrow:   "v",
+	RuneLArrow:   "<",
+	RuneRArrow:   ">",
+	RuneUArrow:   "^",
+	RuneBullet:   "o",
+	RuneBoard:    "#",
+	RuneCkBoard:  ":",
+	RuneDegree:   "\\",
+	RuneDiamond:  "+",
+	RuneGEqual:   ">",
+	RunePi:       "*",
+	RuneHLine:    "-",
+	RuneLantern:  "#",
+	RunePlus:     "+",
+	RuneLEqual:   "<",
+	RuneLLCorner: "+",
+	RuneLRCorner: "+",
+	RuneNEqual:   "!",
+	RunePlMinus:  "#",
+	RuneS1:       "~",
+	RuneS3:       "-",
+	RuneS7:       "-",
+	RuneS9:       "_",
+	RuneBlock:    "#",
+	RuneTTee:     "+",
+	RuneRTee:     "+",
+	RuneLTee:     "+",
+	RuneBTee:     "+",
+	RuneULCorner: "+",
+	RuneURCorner: "+",
+	RuneVLine:    "|",
+}