119 lines
2.7 KiB
Plaintext
119 lines
2.7 KiB
Plaintext
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#!/bin/bash -
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#===============================================================================
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#
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# FILE: show_queue
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#
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# USAGE: ./show_queue
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#
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# DESCRIPTION: Show the pending queue, expanding each album's details from
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# the database.
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#
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# / This version calls sqlite3 once and feeds it queries in a loop /
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#
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# OPTIONS: ---
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# REQUIREMENTS: ---
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# BUGS: ---
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# NOTES: ---
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# AUTHOR: Dave Morriss (djm), Dave.Morriss@gmail.com
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# VERSION: 0.2.1
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# CREATED: 2020-09-15 12:38:03
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# REVISION: 2021-08-05 16:39:05
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#
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#===============================================================================
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set -o nounset # Treat unset variables as an error
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SCRIPT=${0##*/}
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#DIR=${0%/*}
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VERSION='0.2.1'
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#
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# Files and directories
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#
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BASEDIR="$HOME/MusicDownloads"
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DATADIR="$BASEDIR/Magnatune_Data"
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SCRIPTDIR="$BASEDIR/magnatune-downloader"
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QUEUE="$SCRIPTDIR/pending"
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DB="$DATADIR/sqlite_normalized.db"
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#
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# Sanity checks
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#
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[ -e "$QUEUE" ] || { echo "$QUEUE not found"; exit 1; }
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#
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# Check the queue contains data
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#
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if [[ ! -s $QUEUE ]]; then
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echo "$SCRIPT($VERSION): there is nothing in the queue"
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exit
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fi
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RE='^http://magnatune.com/artists/albums/([A-Za-z0-9-]+)/?$'
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#
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# Template SQL for printf
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#
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SQLtemplate=$(cat <<ENDSQL1
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SELECT
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ar.name AS Artist,
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al.name AS Album,
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group_concat(distinct ge.name) AS 'Genre',
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group_concat(distinct sg.name) AS 'Subgenre',
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al.sku as Code
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FROM albums al
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JOIN artists ar ON al.artist_id = ar.artists_id
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JOIN genres_albums ga on al.album_id = ga.album_id
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JOIN genres ge ON ge.genre_id = ga.genre_id
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JOIN subgenres_albums sa on al.album_id = sa.album_id
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JOIN subgenres sg ON sg.subgenre_id = sa.subgenre_id
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GROUP BY al.album_id
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HAVING sku = '%s';
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.print '--------'
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ENDSQL1
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)
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#
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# Start the coprocess
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#
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coproc dbproc { stdbuf -i0 -o0 sqlite3 -line "$DB"; }
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#
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# Read and report the queue elements.
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#
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n=0
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while read -r URL; do
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((n++))
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if [[ $URL =~ $RE ]]; then
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SKU="${BASH_REMATCH[1]}"
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else
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echo "Problem parsing URL in queue (line $n): $URL"
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continue
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fi
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#
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# Build the query and write it to the coprocess
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#
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# shellcheck disable=SC2059
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printf "$SQLtemplate\n" "$SKU" >&"${dbproc[1]}"
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done < "$QUEUE"
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#
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# Close the input pipe (a file descriptor move documented as '[n]>&digit-'
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# which "moves the file descriptor digit to file descriptor n, or the standard
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# output (file descriptor 1) if n is not specified". There is no digit here,
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# so presumably /nothing/ is being moved to the file descriptor in dbproc[1].
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#
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exec {dbproc[1]}>&-
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#
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# Collect everything from the coprocess
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#
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cat <&"${dbproc[0]}"
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# vim: syntax=sh:ts=8:sw=4:ai:et:tw=78:fo=tcrqn21
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