Allow .mid/.MID extension on basename

This changes the command line handling so if the user
specifies the full name of the MIDI file, the code will silently
drop the extension and use that as the base name. This makes
the tool friendlier for people using filename completion, as they
don't have to remember to remove the ".mid" manually.

miditones.c

@@ -95,6 +95,9 @@
   The <basefilename> is the base name, without an extension, for the input and
   output files. It can contain directory path information, or not.
 
+  If the user specifies the full .mid filename, the .mid or .MID extension
+  will be dropped and the remaining name will be used as <basefilename>.
+
   The input file is <basefilename>.mid, and the output filename(s)
   are the base file name with .c, .h, .bin, and/or .log extensions.
 
@@ -347,7 +350,7 @@
       flexible in order to avoid small delays and thus save space in the bytestream.
      -Don't discard fractions of a millisecond in the delay timing, to avoid gradual
       drift of the music. This has been a minor problem since V1.0 in 2011.
- 4 January 2019, Len Shustek, V2.00
+ 4 January 2019, Len Shustek, V2.0
      -Major revision: completely rewrite score processing to allow out-of-order event
       queuing. That lets us implement "release" time that ends notes early, and
       "sustain" time at reduced volume, if we are encoding volume. You can sometimes
@@ -360,6 +363,10 @@
      -Simplify and generalize option parsing, and rename some of the newer ones.
      -Add -scorename so multiple scores can be directly #included into .ino files
       without manually editing the names.
+ 17 October 2020, Ben Combee, V2.1
+     -Let user supply full filename to MIDI file on command line to be friendlier
+      to users using shell autocompletion. If a .mid or .MID file is provided,
+      the extension will be dropped to generate the base filename.
 
 future version ideas
 
@@ -375,7 +382,7 @@ future version ideas
         channel 8 // organ
             options -attacktime=1000 -sustainlevel=80% -releasetime=100 -notemin=200
 */
-#define VERSION "2.00"
+#define VERSION "2.1"
 
 /*--------------------------------------------------------------------------------------------
 
@@ -1531,10 +1538,11 @@ void process_track_data(void) {
 int main (int argc, char *argv[]) {
    int argno;
    char *filebasename;
+   int basenamelen;
 #define MAXPATH 120
    char filename[MAXPATH];
 
-   printf ("MIDITONES V%s, (C) 2011-2019 Len Shustek\n", VERSION);
+   printf ("MIDITONES V%s, (C) 2011-2020 Len Shustek\n", VERSION);
    if (argc == 1) {     // no arguments
       SayUsage (argv[0]);
       return 1; }
@@ -1546,6 +1554,14 @@ int main (int argc, char *argv[]) {
       exit (4); }
    filebasename = argv[argno];
 
+   // strip off trailing .mid or .MID extension if provided by user
+   basenamelen = strlength(filebasename);
+   if (basenamelen > 4 &&
+      (charcmp (filebasename + basenamelen - 4, ".mid") ||
+       charcmp (filebasename + basenamelen - 4, ".MID"))) {
+      filebasename[basenamelen - 4] = 0;
+   }
+
    if (logparse || loggen) { // open the log file
       miditones_strlcpy (filename, filebasename, MAXPATH);
       miditones_strlcat (filename, ".log", MAXPATH);