initial

.gitignore

@@ -0,0 +1 @@
+/.idea

release-book.sh

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+#!/bin/sh
+
+FILES_DIR="$HOME/files"
+ARCHIVE_DIR="$FILES_DIR/4in1-old-versions"
+
+fatal() {
+	>&2 echo "error: $@"
+	exit 1
+}
+
+get_modification_time() {
+    file_path="$1"
+
+    if [ ! -e "$file_path" ]; then
+    	fatal "file not found: $file_path"
+    fi
+
+    mod_time=$(stat -c "%Y" "$file_path")
+    formatted_mod_time=$(date -d "@$mod_time" "+%Y-%m-%d")
+    echo "$formatted_mod_time"
+}
+
+usage() {
+	>&2 echo "usage: $0 <filename> en|ru"
+}
+
+[ $# -ne 2 ] && { usage; exit 1; }
+
+INPUT="$1"
+LANG="$2"
+
+case $LANG in
+    en|ru) : ;;
+    *) fatal "invalid language" ;;
+esac
+
+target_file="$FILES_DIR/4in1-$LANG.pdf"
+old_date="$(get_modification_time "$INPUT")"
+
+[ -d "$ARCHIVE_DIR" ] || {
+	mkdir "$ARCHIVE_DIR"
+	chmod 755 "$ARCHIVE_DIR"
+	chgrp www-data "$ARCHIVE_DIR"
+}
+
+mv "$target_file" "$ARCHIVE_DIR/4in1-$LANG-$old_date.pdf"
+mv "$INPUT" "$target_file"