From b05ad4ddf15b77a3c61450b69908122c1ad626f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20W=C3=BChrer?= <def@gmx.at>
Date: Mon, 10 Aug 2026 19:08:31 +0200
Subject: double-strike enscript frakture monospace sans-serif

---
 bin/double-strike | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100755 bin/double-strike

(limited to 'bin/double-strike')

diff --git a/bin/double-strike b/bin/double-strike
new file mode 100755
index 0000000..92e979d
--- /dev/null
+++ b/bin/double-strike
@@ -0,0 +1,81 @@
+#!/bin/bash
+
+# This style is sometimes known as open-face or blackboard-bold. Double-struck symbols already encoded in the Letterlike Symbols block are omitted here to avoid duplicate encoding. Considerable variation in font style is acceptable, as long as the glyphs retain the visual element of doubled strokes.
+declare -A ds=(
+	[A]=𝔸
+	[B]=𝔹
+	[C]=ℂ
+	[D]=𝔻
+	[E]=𝔼
+	[F]=𝔽
+	[G]=𝔾
+	[H]=ℍ
+	[I]=𝕀
+	[J]=𝕁
+	[K]=𝕂
+	[L]=𝕃
+	[M]=𝕄
+	[N]=ℕ
+	[O]=𝕆
+	[P]=ℙ
+	[Q]=ℚ
+	[R]=ℝ
+	[S]=𝕊
+	[T]=𝕋
+	[U]=𝕌
+	[V]=𝕍
+	[W]=𝕎
+	[X]=𝕏
+	[Y]=𝕐
+	[Z]=ℤ
+	[a]=𝕒
+	[b]=𝕓
+	[c]=𝕔
+	[d]=𝕕
+	[e]=𝕖
+	[f]=𝕗
+	[g]=𝕘
+	[h]=𝕙
+	[i]=𝕚
+	[j]=𝕛
+	[k]=𝕜
+	[l]=𝕝
+	[m]=𝕞
+	[n]=𝕟
+	[o]=𝕠
+	[p]=𝕡
+	[q]=𝕢
+	[r]=𝕣
+	[s]=𝕤
+	[t]=𝕥
+	[u]=𝕦
+	[v]=𝕧
+	[w]=𝕨
+	[x]=𝕩
+	[y]=𝕪
+	[z]=𝕫
+	[0]=𝟘
+	[1]=𝟙
+	[2]=𝟚
+	[3]=𝟛
+	[4]=𝟜
+	[5]=𝟝
+	[6]=𝟞
+	[7]=𝟟
+	[8]=𝟠
+	[9]=𝟡
+)
+
+while IFS= read -r line
+do
+	replacement=""
+	for i in $(seq 0 "$((${#line}-1))")
+	do
+		c1=${line:$i:1}
+		if [[ $c1 =~ [0-9a-zA-Z] ]]
+		then replacement+=${ds[$c1]}
+		else replacement+=$c1
+		fi
+	done
+	echo "$replacement"
+done
-- 
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