Add option to use data for determining filenames in batch mode

As requested by William Buckingham in #23

frontend/main.c

@@ -107,6 +107,9 @@ void usage(void) {
             "  --smalltext           Use half-size text in PNG images\n"
             "  --boldtext            Use bold text in PNG images\n"
             "  --batch               Treat each line of input as a separate data set\n"
+            "  --mirror              Use batch data to determine filename (PNG output)\n"
+            "  --mirroreps           Use batch data to determine filename (EPS output)\n"
+            "  --mirrorsvg           Use batch data to determine filename (SVG output)\n"
             , ZINT_VERSION);
 }
 
@@ -221,12 +224,12 @@ static void concat(char dest[], char source[]) {
     }
 }
 
-int batch_process(struct zint_symbol *symbol, char *filename) {
+int batch_process(struct zint_symbol *symbol, char *filename, int mirror_mode) {
     FILE *file;
     unsigned char buffer[7100];
     unsigned char character = 0;
     int posn = 0, error_number = 0, line_count = 1;
-    char output_file[127];
+    char output_file[256];
     char number[12], reverse_number[12];
     int inpos, local_line_count;
     char format_string[127], reversed_string[127], format_char;
@@ -269,6 +272,8 @@ int batch_process(struct zint_symbol *symbol, char *filename) {
                 posn--;
                 buffer[posn] = '\0';
             }
+            
+            if (mirror_mode == 0) {
                 inpos = 0;
                 local_line_count = line_count;
                 memset(number, 0, sizeof (char) * 12);
@@ -325,6 +330,54 @@ int batch_process(struct zint_symbol *symbol, char *filename) {
                 for (i = 0; i < format_len; i++) {
                     output_file[i] = reversed_string[format_len - i - 1];
                 }
+            } else {
+                /* Name the output file from the data being processed */
+                for (i = 0; (i < posn && i < 250); i++) {
+                    if (buffer[i] < 0x20) {
+                        output_file[i] = '_';
+                    } else {
+                        switch (buffer[i]) {
+                            case 0x21: // !
+                            case 0x22: // "
+                            case 0x2a: // *
+                            case 0x2f: // /
+                            case 0x3a: // :
+                            case 0x3c: // <
+                            case 0x3e: // >
+                            case 0x3f: // ?
+                            case 0x7c: // |
+                            case 0x7f: // DEL
+                                output_file[i] = '_';
+                                break;
+                            default:
+                                output_file[i] = buffer[i];
+                        }
+                    }
+                }
+                
+                /* Add file extension */
+                output_file[i] = '.';
+                
+                if (mirror_mode == 1) {
+                    output_file[i + 1] = 'p';
+                    output_file[i + 2] = 'n';
+                    output_file[i + 3] = 'g';
+                }
+                
+                if (mirror_mode == 2) {
+                    output_file[i + 1] = 'e';
+                    output_file[i + 2] = 'p';
+                    output_file[i + 3] = 's';
+                }
+                
+                if (mirror_mode == 3) {
+                    output_file[i + 1] = 's';
+                    output_file[i + 2] = 'v';
+                    output_file[i + 3] = 'g';
+                }
+                
+                output_file[i + 4] = '\0';
+            }
 
             strcpy(symbol->outfile, output_file);
             error_number = ZBarcode_Encode_and_Print(symbol, buffer, posn, 0);
@@ -365,6 +418,7 @@ int main(int argc, char **argv) {
     int rotate_angle;
     int generated;
     int batch_mode;
+    int filename_reflects_data;
 
     error_number = 0;
     rotate_angle = 0;
@@ -372,6 +426,7 @@ int main(int argc, char **argv) {
     my_symbol = ZBarcode_Create();
     my_symbol->input_mode = UNICODE_MODE;
     batch_mode = 0;
+    filename_reflects_data = 0;
 
     if (argc == 1) {
         usage();
@@ -418,6 +473,9 @@ int main(int argc, char **argv) {
             {"boldtext", 0, 0, 0},
             {"cmyk", 0, 0, 0},
             {"batch", 0, 0, 0},
+            {"mirror", 0, 0, 0},
+            {"mirroreps", 0, 0, 0},
+            {"mirrorsvg", 0, 0, 0},
             {0, 0, 0, 0}
         };
         c = getopt_long(argc, argv, "htb:w:d:o:i:rcmp", long_options, &option_index);
@@ -586,6 +644,18 @@ int main(int argc, char **argv) {
                     /* Switch to batch processing mode */
                     batch_mode = 1;
                 }
+                if (!strcmp(long_options[option_index].name, "mirror")) {
+                    /* Use filenames which reflect content, output to PNG */
+                    filename_reflects_data = 1;
+                }
+                if (!strcmp(long_options[option_index].name, "mirroreps")) {
+                    /* Use filenames which reflect content, output to EPS */
+                    filename_reflects_data = 2;
+                }
+                if (!strcmp(long_options[option_index].name, "mirrorsvg")) {
+                    /* Use filenames which reflect content, output to SVG */
+                    filename_reflects_data = 3;
+                }
                 break;
 
             case 'h':
@@ -653,7 +723,7 @@ int main(int argc, char **argv) {
                     }
                 } else {
                     /* Take each line of text as a separate data set */
-                    error_number = batch_process(my_symbol, optarg);
+                    error_number = batch_process(my_symbol, optarg, filename_reflects_data);
                     generated = 1;
                     if (error_number != 0) {
                         fprintf(stderr, "%s\n", my_symbol->errtxt);