add caching to commands

lib/spotify.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# many functions are invoked via variables
+# shellcheck disable=SC2329
+
+get_spotify_url() {
+    local isrc="$1"
+    if [[ -z "${isrc}" ]]; then
+        error "missing isrc"
+        return 1
+    fi
+
+    local search="isrc:${isrc}"
+    local response
+    response="$(
+        cache_command \
+            spotify \
+            search \
+            --track \
+            "${search}" \
+            --limit 1 \
+            --raw
+    )" || return 1
+
+    local tags=(
+        spotifyISRC
+        spotifyURL
+    )
+    # unset tag values
+    for tag in "${tags[@]}"; do
+        declare "${tag}="
+    done
+
+    local jqFilter='.items[] | "\(.external_ids.isrc)|\(.external_urls.spotify)"'
+    local jqOutput="$(jq -r "${jqFilter}" <<<"${response}")"
+
+    # compare tags versus the reference for each line
+    local foundMatching=false
+    while read -r line; do
+        IFS='|' read -r "${tags[@]}" <<<"${line}"
+
+        for tag in "${tags[@]}"; do
+            declare -n spotifyTagValue="${tag}"
+            debug "${tag}=${spotifyTagValue}"
+        done
+
+        # shellcheck disable=SC2154
+        if [[ "${spotifyISRC,,}" == "${isrc,,}" ]]; then
+            foundMatching=true
+            break
+        fi
+    done <<<"${jqOutput}"
+
+    if [[ "${foundMatching}" == false ]]; then
+        error "could not find matching spotify track for ${isrc}"
+        return 1
+    fi
+
+    # shellcheck disable=SC2154
+    echo "${spotifyURL}"
+    return 0
+}
+
+download_with_spotify() {
+    local isrc="$1"
+    local output="$2"
+    download_with_librelyrics \
+        "${isrc}" \
+        "${output}" \
+        spotify
+}