Separate main function, parse command-line options

.gitignore

@@ -17,10 +17,9 @@ src/Makefile
 src/Makefile.in
 src/sermon
 src/sermon_lexer.c
-src/sermon_lexer.o
 src/sermon_parser.c
 src/sermon_parser.h
-src/sermon_parser.o
-src/sermon_util.o
 stamp-h1
 ylwrap
+*.o
+*.core

src/Makefile.am

@@ -1,6 +1,6 @@
 bin_PROGRAMS = sermon
 BUILT_SOURCES = sermon_lexer.c sermon_parser.c sermon_parser.h
 AM_YFLAGS = -d --location
-sermon_SOURCES = sermon_lexer.l sermon_parser.y sermon_util.c
+sermon_SOURCES = sermon_lexer.l sermon_parser.y sermon_util.c main.c
 CLEANFILES = sermon_lexer.c sermon_parser.c sermon_parser.h
 LIBS = $(LEXLIB)

src/main.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "sermon.h"
+
+extern int yyparse(Sermon *);
+extern FILE* yyin;
+
+void usage(const char* progname) {
+    fprintf(stderr, "Usage: %s [-h] FILE\n"
+            "\n"
+            "    -h           Display help message\n"
+            "\n"
+            "    FILE         sermon file to scan\n", progname);
+}
+
+int main(int argc, char* argv[]) {
+    Sermon sermon;
+    int i = 0, block = 0, normal = 0;
+    const char* progname = argv[0], *filename = NULL;
+    while (++i < argc) {
+        if (strcmp(argv[i], "-h") == 0) { usage(progname); exit(0); }
+        else if ((argv[i][0] == '-') && (argv[i][1] != '\0')) {
+            fprintf(stderr, "Unknown option: %s\n", argv[i]);
+        }
+        else {
+            filename = argv[i];
+        }
+    }
+    if (!filename) {
+        usage(progname);
+        exit(1);
+    }
+    InitSermon(&sermon);
+    if (strcmp(filename, "-") == 0) {
+        yyin = stdin;
+    } else {
+        yyin = fopen(argv[1], "rt");
+    }
+    yyparse(&sermon);
+    printf("Parsed sermon.\n");
+    printf("TITLE=%s\n", sermon.sermonTitle ? sermon.sermonTitle : "none");
+    printf("AUTHOR=%s\n", sermon.sermonAuthor ? sermon.sermonAuthor : "none");
+    printf("DATE=%s\n", sermon.sermonDate ? sermon.sermonDate : "none");
+    printf("OCCASION=%s\n", sermon.sermonOccasion ? sermon.sermonOccasion : "none");
+    printf("TEXT=%s\n", sermon.sermonText ? sermon.sermonText : "none");
+    printf("\nThere are %d paragraphs", sermon.numParagraphs);
+    for (i = 0; i < sermon.numParagraphs; i++) {
+        if (sermon.sermonParagraphs[i].paraType == PARA_DEFAULT) normal++;
+        else if (sermon.sermonParagraphs[i].paraType == PARA_BLOCKQUOTE) block++;
+    }
+    printf(" (%d regular, %d blockquote)\n", normal, block);
+    printf("\nThere are %d references.\n", sermon.numReferences);
+    for (i = 0; i < sermon.numReferences; i++) {
+        printf("    - %s: %s\n", sermon.sermonReferences[i].refId, sermon.sermonReferences[i].refText);
+    }
+    printf("\n");
+    FreeSermon(&sermon);
+    if (strcmp(filename, "-") != 0) {
+        fclose(yyin);
+    }
+}
+

src/sermon_parser.y

@@ -130,33 +130,6 @@ reference:
         ;
 %%
 
-int main(int argc, char* argv[]) {
-    Sermon sermon;
-    int i = 0, block = 0, normal = 0;
-    InitSermon(&sermon);
-    yyin = fopen(argv[1], "rt");
-    yyparse(&sermon);
-    printf("Parsed sermon.\n");
-    printf("TITLE=%s\n", sermon.sermonTitle ? sermon.sermonTitle : "none");
-    printf("AUTHOR=%s\n", sermon.sermonAuthor ? sermon.sermonAuthor : "none");
-    printf("DATE=%s\n", sermon.sermonDate ? sermon.sermonDate : "none");
-    printf("OCCASION=%s\n", sermon.sermonOccasion ? sermon.sermonOccasion : "none");
-    printf("TEXT=%s\n", sermon.sermonText ? sermon.sermonText : "none");
-    printf("\nThere are %d paragraphs", sermon.numParagraphs);
-    for (i = 0; i < sermon.numParagraphs; i++) {
-        if (sermon.sermonParagraphs[i].paraType == PARA_DEFAULT) normal++;
-        else if (sermon.sermonParagraphs[i].paraType == PARA_BLOCKQUOTE) block++;
-    }
-    printf(" (%d regular, %d blockquote)\n", normal, block);
-    printf("\nThere are %d references.\n", sermon.numReferences);
-    for (i = 0; i < sermon.numReferences; i++) {
-        printf("    - %s: %s\n", sermon.sermonReferences[i].refId, sermon.sermonReferences[i].refText);
-    }
-    printf("\n");
-    FreeSermon(&sermon);
-    fclose(yyin);
-}
-
 void yyerror(Sermon* s, const char* msg) {
     fprintf(stderr, "Parse error (%d:%d): %s - \"%s\"\n", yylloc.first_line, yylloc.first_column, msg, yytext);
     exit(1);