Provide option GTFS_RANGE to configure schedules included

The environment variable GTFS_RANGE will configure the schedules
included. If not specified the default is the previously hardcoded
value, 3 months.

Because mysql makes it annoying to provide an interval as an argument I
just string interpolate it. The docs have a warning not to allow
untrusted input.

src/cli/OutputGTFSCommand.ts

@@ -31,8 +31,13 @@ export class OutputGTFSCommand implements CLICommand {
       throw new Error(`Output path ${this.baseDir} does not exist.`);
     }
 
+    if (Object.hasOwn(process.env, "GTFS_RANGE")) {
+      console.log(`Using GTFS_RANGE = ${process.env.GTFS_RANGE}\n`);
+    }
+    const range = process.env.GTFS_RANGE || "3 MONTH";
+
     const associationsP = this.repository.getAssociations();
-    const scheduleResultsP = this.repository.getSchedules();
+    const scheduleResultsP = this.repository.getSchedules(range);
     const transfersP = this.copy(this.repository.getTransfers(), "transfers.txt");
     const stopsP = this.copy(this.repository.getStops(), "stops.txt");
     const agencyP = this.copy(agencies, "agency.txt");

src/cli/ShowHelpCommand.ts

@@ -37,6 +37,10 @@ The --get-* and --download-* commands require SFTP environment properties:
   SFTP_USERNAME              SFTP username
   SFTP_PASSWORD              SFTP password
   SFTP_HOSTNAME              SFTP hostname (defaults to dtd.atocrsp.org)
+
+The --gtfs and --gtfs-zip commands take the following environment properties:
+
+  GTFS_RANGE                 A mysql interval expression for the scedules to include. This is NOT SANITIZED so it cannot be untrusted user input (defaults to '3 MONTH')
   
 `);
 

src/gtfs/repository/CIFRepository.ts

@@ -80,8 +80,11 @@ export class CIFRepository {
    *
    * The second query selects all the z-trains (usually replacement buses) within three months. They already use CRS
    * codes as the location so avoid the disaster above.
+   *
+   * The argument range is a mysql expression like '3 MONTH'.
+   *   It is NOT SANITIZED so it cannot be untrusted user input.
    */
-  public async getSchedules(): Promise<ScheduleResults> {
+  public async getSchedules(range: string): Promise<ScheduleResults> {
     const scheduleBuilder = new ScheduleBuilder();
     const [[lastSchedule]] = await this.db.query<{id: number}>("SELECT id FROM schedule ORDER BY id desc LIMIT 1");
 
@@ -103,7 +106,7 @@ export class CIFRepository {
         (
           stop_time.id IS NULL OR crs_code IS NOT NULL
         )
-        AND runs_from < CURDATE() + INTERVAL 3 MONTH
+        AND runs_from < CURDATE() + INTERVAL ${range}
         AND runs_to >= CURDATE()
         AND scheduled_pass_time is null
         ORDER BY stp_indicator DESC, id, stop_id