From a24a3520c7e0230b0b3b853db0cb2871427d1ab4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Sat, 2 May 2020 18:25:15 +0200
Subject: [PATCH] script: generate-unicode-precompose: generate a complete
 header file

---
 scripts/generate-unicode-precompose.sh | 29 ++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/scripts/generate-unicode-precompose.sh b/scripts/generate-unicode-precompose.sh
index 830e9379..49e12650 100755
--- a/scripts/generate-unicode-precompose.sh
+++ b/scripts/generate-unicode-precompose.sh
@@ -1,8 +1,33 @@
 #!/usr/bin/sh
 
-cut - -d ";" -f 1,6 |
+unicodedata_txt="${1}"
+output="${2}"
+
+cat <<EOF > "${output}"
+#pragma once
+
+#include <wchar.h>
+
+static const struct {
+    wchar_t replacement;
+    wchar_t base;
+    wchar_t comb;
+} precompose_table[] = {
+EOF
+
+# extract canonical decomposition data from UnicodeData.txt,
+# - pad hex values to 5 digits,
+# - sort numerically on base character, then combining character,
+# - then reduce to 4 digits again where possible
+#
+# "borrowed" from xterm/unicode/make-precompose.sh
+
+cut "${unicodedata_txt}" -d ";" -f 1,6 |
     grep ";[0-9,A-F]" | grep " " |
     sed -e "s/ /, 0x/;s/^/{ 0x/;s/;/, 0x/;s/$/},/" |
     sed -e "s,0x\(....\)\([^0-9A-Fa-f]\),0x0\1\2,g" |
     (sort -k 3 || sort +2) |
-    sed -e "s,0x0\(...[0-9A-Fa-f]\),0x\1,g"
+    sed -e "s,0x0\(...[0-9A-Fa-f]\),0x\1,g" |
+    sed 's/^/    /' >> "${output}"
+
+echo "};" >> "${output}"