Allow user to select stylesheet from command line

src/main.c

@@ -14,8 +14,9 @@ int main(int argc, char* argv[]) {
     Sermon sermon;
     xmlDocPtr document, transformed;
     int i = 0, block = 0, normal = 0;
-    InitOptions(argc, argv);
+    InitOptions(argc, (const char**)argv);
     InitSermon(&sermon);
+
     if (strcmp(options.inputFileName, "-") == 0) {
         yyin = stdin;
     } else {
@@ -24,12 +25,12 @@ int main(int argc, char* argv[]) {
     yyparse(&sermon);
 
     document = sermonToXmlDoc(&sermon);
-    transformed = applyStyleSheet(document, "html5");
+    transformed = applyStyleSheet(document, options.styleSheetName);
     printXML(transformed);
-    xmlFreeDoc(document);
-    xmlFreeDoc(transformed);
 
     /* clean up, clean up, everybody, everywhere! */
+    xmlFreeDoc(document);
+    xmlFreeDoc(transformed);
     FreeSermon(&sermon);
     if (strcmp(options.inputFileName, "-") != 0) {
         fclose(yyin);

src/options.c

@@ -6,7 +6,7 @@
 #include <libgen.h>
 #include "options.h"
 
-Options options = { .progname = NULL, .datadir = DATADIR };
+Options options = { .progname = NULL, .datadir = DATADIR, .styleSheetName = "html5" };
 
 char*
 datadir(const char* progname) {
@@ -39,7 +39,8 @@ datadir(const char* progname) {
 static void usage(const char* progname) {
     fprintf(stderr, "Usage: %s [-h] FILE\n"
             "\n"
-            "    -h           Display help message\n"
+            "    -h             Display help message\n"
+            "    -s STYLESHEET  Apply stylesheet (default \"html5\")\n"
             "\n"
             "    FILE         sermon file to scan (\"-\" for stdin)\n", progname);
 }
@@ -52,6 +53,10 @@ void InitOptions(int argc, const char* argv[]) {
         if (strcmp(argv[i], "-h") == 0) { usage(options.progname); exit(0); }
         else if (strcmp(argv[i], "-") == 0) {
             options.inputFileName = argv[i];
+        } else if (strcmp(argv[i], "-s") == 0) {
+            options.styleSheetName = argv[++i];
+        } else if (strncmp(argv[i], "-s", 2) == 0) {
+            options.styleSheetName = argv[i] + 2;
         } else if (argv[i][0] == '-') {
             fprintf(stderr, "Unknown option: %s\n", argv[i]);
         } else {

src/options.h

@@ -5,6 +5,7 @@ typedef struct {
     const char* progname;
     char* datadir;
     const char* inputFileName;
+    const char* styleSheetName;
 } Options;
 
 extern Options options;