#!/usr/bin/env bash

# Check calling convention
[[ -n "$1" ]] || {
    echo "showPost requires an argument" 1>&2
    exit 1
}

[[ -n "$BASE_DIR" ]] || {
    echo "showPost requires BASE_DIR" 1>&2
    exit 1
}

[[ -n "$STRIP_PREFIX" ]] || {
    echo "showPost requires STRIP_PREFIX" 1>&2
    exit 1
}


function getTitle {
    # Get the contents of <title />
    TTL=$(xidel - -s --extract "/html/head/title/text()" < "$1")
    [[ -n "$TTL" ]] && {
        echo "$TTL"
        return
    }

    TTL=$(xidel - -s --extract "//h1/text()" < "$1")
    [[ -n "$TTL" ]] && {
        echo "No <title /> element for '$1', falling back to <h1 />" 1>&2
        echo "$TTL"
        return
    }

    TTL=$(basename "$1" .html)
    [[ -n "$TTL" ]] && {
        echo "No <title /> element for '$1', falling back to filename" 1>&2
        echo "$TTL"
        return
    }

    TTL="Untitled"
    echo "No <title /> element for '$1', falling back to '$TTL'" 1>&2
    echo "$TTL"
}

function getDate {
    # Dates are in filenames
    basename "$1" | cut -c 1-10
}

function getUrl {
    # Strip local prefix off argument to get the post's URL
    F=$(echo "$1" | replace "$STRIP_PREFIX" '')
    echo "$BASE_DIR/$F"
}

function renderTime {
    DATE=$(getDate "$1")
    printf '<time class="dt-published" datetime="%s">%s</time>' "$DATE" "$DATE"
}

function renderLink {
    TITLE=$(getTitle "$1")
    URL=$(getUrl "$1")
    printf '<a class="p-name u-url" href="/%s">%s</a>' "$URL" "$TITLE"
}

function extraClasses {
    if grep -F "$(basename "$1")" < "$RANTS" > /dev/null
    then
        printf 'rant'
    else
        printf ' '
    fi
}

function renderEntry {
    TIME=$(renderTime   "$1")
    LINK=$(renderLink   "$1")
    CLSS=$(extraClasses "$1")
    printf '<li class="h-entry %s">%s - %s</li>' "$CLSS" "$LINK" "$TIME"
}

renderEntry "$1"