terminfo: add scripts/update_terminfo.sh

This script updates the built-in terminfo entries.

[skip ci]

scripts/update_terminfo.sh

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+#
+# usage: ./scripts/update_terminfo.sh
+#
+# This script does:
+#
+#   1. Download Dickey's terminfo.src
+#   2. Compile temporary terminfo database from terminfo.src
+#   3. Use database to generate src/nvim/tui/terminfo_defs.h
+#
+
+set -e
+
+url='https://invisible-island.net/datafiles/current/terminfo.src.gz'
+target='src/nvim/tui/terminfo_defs.h'
+
+readonly -A entries=(
+  [ansi]=ansi_terminfo
+  [interix]=interix_8colour_terminfo
+  [iterm2]=iterm_256colour_terminfo
+  [linux]=linux_16colour_terminfo
+  [putty-256color]=putty_256colour_terminfo
+  [rxvt-256color]=rxvt_256colour_terminfo
+  [screen-256color]=screen_256colour_terminfo
+  [st-256color]=st_256colour_terminfo
+  [tmux-256color]=tmux_256colour_terminfo
+  [vte-256color]=vte_256colour_terminfo
+  [xterm-256color]=xterm_256colour_terminfo
+)
+
+db="$(mktemp -du)"
+
+print_bold() {
+  printf "\\e[1m$*\\e[0m"
+}
+
+cd "$(git rev-parse --show-toplevel)"
+
+#
+# Get terminfo.src
+#
+print_bold '[*] Get terminfo.src\n'
+curl -O "$url"
+gunzip -f terminfo.src.gz
+
+#
+# Build terminfo database
+#
+print_bold '[*] Build terminfo database\n'
+tic -x -o "$db" terminfo.src
+rm -f terminfo.src
+
+#
+# Write src/nvim/tui/terminfo_defs.h
+#
+print_bold "[*] Writing $target... "
+sorted_terms="$(echo "${!entries[@]}" | tr ' ' '\n' | sort | xargs)"
+
+cat > "$target" <<EOF
+// This is an open source non-commercial project. Dear PVS-Studio, please check
+// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+
+//
+// This file got generated by scripts/update_terminfo.sh and $(tic -V)
+//
+EOF
+
+for term in $sorted_terms; do
+  path="$(find "$db" -name "$term")"
+  if [[ -z $path ]]; then
+    echo "Not found: $term. Skipping." 1>&2
+    continue
+  fi
+  echo
+  infocmp -L -1 -A "$db" "$term" | sed -e '1d' -e 's#^#// #' | tr '\t' ' '
+  echo "static const int8_t ${entries[$term]}[] = {"
+  echo -n "  "; od -v -t d1 < "$path" | cut -c9- | xargs | tr ' ' ','
+  echo "};"
+done >> "$target"
+
+print_bold 'done\n'