Add a bash script for recording mscale #2

bin/mscale-record.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Print the current mscale value.
+function mscale() {
+  curl --silent https://weathernews.jp/mscale/json/scale.json | jq -r .mscale
+}
+
+# Print the current time in Japan.
+function jst() {
+  TZ=Asia/Tokyo date --iso-8601=minutes
+}
+
+# Print the current time in Japan with hourly resolution.
+function jst_1h() {
+  jst | perl -pe 's/T(\d{2}):\d{2}/T$1:00/'
+}
+
+# Print an mscale row by jst if it exists.
+function exists_sql {
+  echo "SELECT val, jst FROM mscale WHERE jst = \"$1\""
+}
+
+# Print an INSERT statement for adding data to mscale.
+function insert_sql {
+  echo "INSERT INTO mscale (val, jst) VALUES ($1, \"$2\");"
+}
+
+# Print an UPDATE statement
+function update_sql {
+  echo "UPDATE mscale SET val = $1 WHERE jst = \"$2\";"
+}
+
+function main() {
+  db=${1:-mscale.db}
+  if [[ $(exists_sql `jst_1h` | sqlite3 "$db" | wc -l) > 0 ]] ; then
+    # update
+    update_sql `mscale` `jst_1h` | sqlite3 "$db"
+  else
+    # insert
+    insert_sql `mscale` `jst_1h` | sqlite3 "$db"
+  fi
+}
+
+# What is the bash equivalent of Python's `if __name__ == '__main__'`?
+# https://stackoverflow.com/a/29967433
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    main "$@"
+fi