From a1ba114f1cd89ceda63cc8d32e0f3facf401dc39 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Tue, 20 Apr 2021 11:55:27 +0200
Subject: Add option to output to file directly instead of stdout

---
 src/main.c | 60 ++++++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 38 insertions(+), 22 deletions(-)

diff --git a/src/main.c b/src/main.c
index ae4cf76..dcc9075 100644
--- a/src/main.c
+++ b/src/main.c
@@ -40,38 +40,38 @@ typedef struct Image {
 } Image;
 
 void
-export_c_file(Tiles *tiles, Palette *palette) {
+export_c_file(Tiles *tiles, Palette *palette, FILE *file) {
     // Output tiles.
-    printf("u32 tiles[%u][%u] = {\n", tiles->capacity, TILE_SIZE);
+    fprintf(file, "u32 tiles[%u][%u] = {\n", tiles->capacity, TILE_SIZE);
     for (size_t i = 0; i < tiles->capacity; ++i) {
-        printf("    {");
+        fprintf(file, "    {");
         for (size_t j = 0; j < TILE_SIZE; ++j) {
-            printf("0x%08x", tiles->data[i][j]);
+            fprintf(file, "0x%08x", tiles->data[i][j]);
             if (j != (TILE_SIZE - 1)) {
-                printf(", ");
+                fprintf(file, ", ");
             }
         }
-        printf("},\n");
+        fprintf(file, "},\n");
     }
-    printf("};\n");
-    printf("\n");
+    fprintf(file, "};\n");
+    fprintf(file, "\n");
 
     // Output palette.
-    printf("u16 palette[%u] = {\n", palette->capacity);
-    printf("    ");
+    fprintf(file, "u16 palette[%u] = {\n", palette->capacity);
+    fprintf(file, "    ");
     size_t counter = 0;
     for (size_t i = 0; i < palette->capacity; ++i, ++counter) {
             if (counter == 4) {
                 counter = 0;
-                printf("\n    ");
+                fprintf(file, "\n    ");
             }
-            printf("0x%04x,", palette->data[i]);
+            fprintf(file, "0x%04x,", palette->data[i]);
             if (counter < 3) {
-                printf(" ");
+                fprintf(file, " ");
             }
     }
-    printf("\n");
-    printf("};\n");
+    fprintf(file, "\n");
+    fprintf(file, "};\n");
 }
 
 void
@@ -79,8 +79,8 @@ print_usage(void) {
     printf("Usage: %s [options] <filename>\n", BIN_NAME);
     printf("\n");
     printf("\t-b <RRGGBB>\tSelects the background color used for transparency.\n");
+    printf("\t-o <out_file.c>\tPath to the output file. If blank, stdout will be used.\n");
     printf("\n");
-    // TODO: Print valid options as a suggestion.
 }
 
 void
@@ -153,9 +153,10 @@ int
 main(int argc, char *argv[]) {
     u16 background_color = DEFAULT_BG_COLOR;
     u16 palette_size = DEFAULT_PALETTE_SIZE;
+    char *out_file_path = NULL;
 
     int option;
-    while ((option = getopt(argc, argv, "hb:")) != -1) {
+    while ((option = getopt(argc, argv, "hb:o:")) != -1) {
         switch (option) {
             // TODO: -o output file name. If none is given, the output will be
             //           redirected to stdout.
@@ -187,6 +188,9 @@ main(int argc, char *argv[]) {
                 blue = (blue * 31 / 255);
                 background_color = rgb15(red, green, blue);
             } break;
+            case 'o': {
+                out_file_path = optarg;
+            } break;
             case 'h': {
                 print_usage();
                 return EXIT_SUCCESS;
@@ -219,11 +223,12 @@ main(int argc, char *argv[]) {
     Image img = {0};
 
     // Open the given file.
-    img.data = stbi_load(file_name, &img.width, &img.height, &img.n_channels, 0);
-    if (img.data == NULL) {
-        fprintf(stderr, "Error: can't open the given file.\n");
+    FILE *input_file = fopen(file_name, "rb");
+    if (input_file == NULL) {
+        fprintf(stderr, "%s: can't open input file: %s\n", BIN_NAME, file_name);
         return EXIT_FAILURE;
     }
+    img.data = stbi_load_from_file(input_file, &img.width, &img.height, &img.n_channels, 0);
 
     // TODO: Implement support for different file inputs.
     if (img.n_channels != 3) {
@@ -254,9 +259,20 @@ main(int argc, char *argv[]) {
         }
     }
 
-    export_c_file(&tiles, &palette);
+    if (out_file_path == NULL) {
+        export_c_file(&tiles, &palette, stdout);
+    } else {
+        FILE *file = fopen(out_file_path, "w");
+        if (!file) {
+            fprintf(stderr, "%s: can't open output file: %s\n", out_file_path);
+            return EXIT_FAILURE;
+        }
+        export_c_file(&tiles, &palette, file);
+    }
 
-    // TODO: Cleanup other resources.
+    // Cleanup resources and exit.
+    free(tiles.data);
+    free(palette.data);
     stbi_image_free(img.data);
     return EXIT_SUCCESS;
 }
-- 
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