#!/bin/sh -eu

. ./config

title="${1:-$TITLE}"
content=$(cat)

awk \
    -v title="$title" \
    -v content="$content" \
    -v header="$TEMP_HEAD" \
    -v footer="$TEMP_FOOT" \
    '
function replace(str, pat, rep,    out, parts, n, i) {
    n = split(str, parts, pat)
    out = parts[1]
    for (i = 2; i <= n; i++)
        out = out rep parts[i]
    return out
}

BEGIN {
    while ((getline line < header) > 0) hbuf = hbuf line "\n"
    close(header)
    while ((getline line < footer) > 0) fbuf = fbuf line "\n"
    close(footer)
}

{
    line = $0
    line = replace(line, "{{TITLE}}", title)
    line = replace(line, "{{CONTENT}}", content)
    line = replace(line, "{{HEADER}}", hbuf)
    line = replace(line, "{{FOOTER}}", fbuf)
    print line
}' "$TEMP_PAGE"