From 9cb1b773b16baa0a13c8c27b36b30e8509fd248c Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Tue, 28 Dec 2021 16:24:38 +0100
Subject: [PATCH] charset: legacy encodings petscii, atascii, msx, zx-spectrum

Sources now represented by unicode 13.0 legacy computing symbols.
Copied from Wikipedia.
---
 charset-encoding.inc.pl | 45 +++++++++++++++++++++++++++++++++++++++++
 charset.plp             |  4 +++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/charset-encoding.inc.pl b/charset-encoding.inc.pl
index 1414f39..2da7614 100644
--- a/charset-encoding.inc.pl
+++ b/charset-encoding.inc.pl
@@ -218,6 +218,51 @@ use utf8;
 	'cp1026'       => {inherit => ['cp37' => '40']},
 	'cp875'        => {inherit => ['cp37' => '30']},
 
+	legacy     => [qw( cp437 ATASCII PETSCII MSX ZX-Spectrum )],
+	'petscii'      => {inherit => ['' => '40-7F+A0-BF'], setup => sub {
+		$_[0]->{table} = [(map {chr} 0 .. 0x3F), qw(
+			@ a b c d e f g h i j k l m n o p q r s t u v w x y z [ £ ] ↑ ←
+			🭹 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ┼ 🮌 │ 🮖 🮘
+			. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+			  ▌ ▄ ▔ ▁ ▏ ▒ ▕ 🮏 🮙 🮇 ├ ▗ └ ┐ ▂ ┌ ┴ ┬ ┤ ▎ ▍ 🮈 🮂 🮃 ▃ ✓ ▖ ▝ ┘ ▘ ▚
+		)];
+	}},
+	'atascii'      => {inherit => ['' => '0-1F+60-7F'], setup => sub {
+		$_[0]->{table} = [qw(
+			♥ ├ 🮇 ┘ ┤ ┐ ╱ ╲ ◢ ▗ ◣ ▝ ▘ 🮂 ▂ ▖ ♣ ┌ ─ ┼ • ▄ ▎ ┬ ┴ ▌ └ ␛ ↑ ↓ ← →
+			_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
+			_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
+			♦ a b c d e f g h i j k l m n o p q r s t u v w x y z ♠ | 🢰 ◀ ▶
+		)];
+	}},
+	'zx-spectrum'  => {
+		inherit => ['' => '50-8F'],
+		set => 'ascii',
+		replace => {
+			ord('^') => '↑',
+			ord('`') => '£',
+			0x7F => '© ▝▘▀▗▐▚▜▖▞▌▛▄▟▙█',
+		},
+	},
+	'msx'          => {inherit => ['cp437' => '80-FF'], setup => sub {
+		$_[0]->{table} = [(map {chr} 0 .. 0x7F), qw(
+			Ç ü é â ä à å ç ê ë è ï î ì Ä Å É æ Æ ô ö ò û ù ÿ Ö Ü ¢ £ ¥ ₧ ƒ
+			á í ó ú ñ Ñ ª º ¿ ⌐ ¬ ½ ¼ ¡ « » Ã ã Ĩ ĩ Õ õ Ũ ũ IJ ij ¾ ∽ ◊ ‰ ¶ §
+			▂ ▚ ▆ 🮂 ▬ 🮅 ▎ ▞ ▊ 🮇 🮊 🮙 🮘 🭭 🭯 🭬 🭮 🮚 🮛 ▘ ▗ ▝ ▖ 🮖 Δ ‡ ω █ ▄ ▌ ▐ ▀
+			α ß Γ π Σ σ µ τ Φ Θ Ω δ ∞ ⌀ ∈ ∩ ≡ ± ≥ ≤ ⌠ ⌡ ÷ ≈ ° ∙ · √ ⁿ ² ■
+		)];
+	}},
+	'brascii'      => {
+		inherit => ['' => 'D0-DF+F0-FF'],
+		setup => sub {
+			$_[0]->{table} = [(map {chr} 0 .. 0xFF)];
+		},
+		replace => {
+			0xD7 => 'Œ',
+			0xF7 => 'œ',
+		},
+	},
+
 	''             => {setup => sub {
 		my $row = shift;
 		$row->{offset} = delete $row->{startpoint};
diff --git a/charset.plp b/charset.plp
index d8527f0..ccbf145 100644
--- a/charset.plp
+++ b/charset.plp
@@ -55,6 +55,7 @@ print join " •\n", (
 		dos      => 'DOS',
 		mac      => 'Apple',
 		ebcdic   => 'EBCDIC',
+		legacy   => 'legacy',
 		$tablist[0] eq 'default' ? () : ('' => 'common'),
 	],
 	[
@@ -153,7 +154,7 @@ sub tabinput {
 	if (defined $row{table} or defined $row{cell}) {
 		$row{set} //= $input;
 	}
-	elsif ($row{set} = Encode::resolve_alias($input)) {
+	elsif ($row{set} = Encode::resolve_alias($charset->{set} // $input)) {
 		$row{offset} = delete $row{startpoint};
 		if ($charset->{varchar}) {
 			# array of possibly multiple characters per code point
@@ -169,6 +170,7 @@ sub tabinput {
 
 		$row{endpoint} -= $row{offset};
 		$visible->{ascii}++;  # assume common base
+		$row{set} = $input if $charset->{set};  # base override
 	}
 	else {
 		Alert("Encoding <q>$input</q> unknown");
-- 
2.30.0