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#!/usr/bin/env bash

usage() {
    printf "Usage: build-db db-file sql-file dir [dirs...]\n" >&2
}

create_entry() {
    FILE="$1"
    SUBDIR="$2"

    SECTION=$(basename "$FILE" | sed -E 's|.*\.([0-9])\..*|\1|')
    NAME=$(basename "$FILE" | sed -E 's|(.*)\.[0-9]\.html|\1|')
    OS=$(basename "$SUBDIR")

    if [[ -n "$(echo "$FILE" | grep "man$SECTION\.")" ]];
    then
        NAME="$(echo "$FILE" | sed -E "s|.*man$SECTION\.(.*)/.*|\1|" ).$NAME"
    fi

    STATEMENT="INSERT INTO manpages (os, name, section, path) VALUES ('"$OS"', '"$NAME"', '"$SECTION"', '"$FILE"');"
    printf "%s\n" "$STATEMENT"
}

if [[ $# -lt 3 ]];
then
    usage
    exit 1
fi

DB_FILE="$1"
SQL_FILE="$2"
shift 2
SUBDIRS=$@

rm -f "$DB_FILE"

cat <<EOF > "$SQL_FILE"
CREATE TABLE manpages (
    os TEXT,
    name TEXT,
    section INTEGER,
    path TEXT,
    PRIMARY KEY (os, name, section)
);
EOF

for SUBDIR in ${SUBDIRS[*]};
do
    FILES=$(find "$SUBDIR" -type f -name "*.html")

    for FILE in ${FILES[*]};
    do
        create_entry "$FILE" "$SUBDIR" >> "$SQL_FILE"
    done
done

sqlite3 "$DB_FILE" < "$SQL_FILE"
chmod 400 "$DB_FILE"
rm "$SQL_FILE"