Add web app frontend, restructure almost everything

- Add web app frontend code
- Add .html, .js, .wasm to .gitignore
- Restructure Makefile to work with emmake, add build targets for web app,
  add .html, .js, .wasm to make clean
- Explain the pattern in the README
- Add explanation of web frontend to README
- Restructure README generally for better clarity
- Remove "make web app version" from todos in README
- Set Doxygen to EXTRACT_ALL so trivial and useless doc comments are not
  needed when the naming suffices to be explanatory.
- Move ascii_binary_str_to_ints to library code in new file
  hitomezashi_utils.c (and corresponding header) as web app also needs it.
- Fix SDL2 include path so it also works with Emscripten
- Remove some cluttering and unnecessary doc comments
- Improve some doc comments

3 files changed, 10 insertions, 28 deletions

diff --git a/cli/Doxyfile b/cli/Doxyfile
index 9d87f6b..96d5070 100644
--- a/cli/Doxyfile
+++ b/cli/Doxyfile
@@ -477,7 +477,7 @@ NUM_PROC_THREADS       = 1
 # normally produced when WARNINGS is set to YES.
 # The default value is: NO.
 
-EXTRACT_ALL            = NO
+EXTRACT_ALL            = YES
 
 # If the EXTRACT_PRIVATE tag is set to YES, all private members of a class will
 # be included in the documentation.
diff --git a/cli/hitomezashi_cli.c b/cli/hitomezashi_cli.c
index 70a2812..72d43b7 100644
--- a/cli/hitomezashi_cli.c
+++ b/cli/hitomezashi_cli.c
@@ -1,17 +1,20 @@
 /** @file */
 
 #include "hitomezashi_cli.h"
+
 #include "SDL.h"
 #define OPTPARSE_IMPLEMENTATION
 #define OPTPARSE_API static
-#include "hitomezashi.h"
-#include "optparse/optparse.h"
 #include <limits.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "hitomezashi.h"
+#include "hitomezashi_utils.h"
+#include "optparse.h"
+
 /** Initialise SDL, pass the information from hitomezashi_cli_handle_args() to
  * libhitomezashi, and save the resulting image. */
 int main(int argc, char **argv) {
@@ -67,24 +70,6 @@ void hitomezashi_cli_help(void) {
   exit(Hitomezashi_Cli_Exit_Code_Success);
 }
 
-char *hitomezashi_cli_ascii_binary_str_to_ints(char *ascii_str, size_t n) {
-  char *res = malloc(n);
-  for (int i = 0; i < n; ++i) {
-    switch (ascii_str[i]) {
-    case '0':;
-      res[i] = 0;
-      break;
-    case '1':;
-      res[i] = 1;
-      break;
-    default:;
-      free(res);
-      return NULL;
-    }
-  }
-  return res;
-}
-
 void hitomezashi_cli_handle_args(char **out_file_path, int *x_pattern_len,
                                  int *y_pattern_len, char **x_pattern,
                                  char **y_pattern, int *gap, int *thickness,
@@ -112,8 +97,8 @@ void hitomezashi_cli_handle_args(char **out_file_path, int *x_pattern_len,
         exit(Hitomezashi_Cli_Exit_Code_Err_Handle_Args);
       }
       *x_pattern_len = x_pattern_len_l;
-      *x_pattern = hitomezashi_cli_ascii_binary_str_to_ints(options.optarg,
-                                                            *x_pattern_len);
+      *x_pattern =
+          hitomezashi_ascii_binary_str_to_ints(options.optarg, *x_pattern_len);
       if (!*x_pattern) {
         SDL_LogCritical(SDL_LOG_CATEGORY_ERROR, "Invalid x pattern; see -h");
         exit(Hitomezashi_Cli_Exit_Code_Err_Handle_Args);
@@ -128,8 +113,8 @@ void hitomezashi_cli_handle_args(char **out_file_path, int *x_pattern_len,
         exit(Hitomezashi_Cli_Exit_Code_Err_Handle_Args);
       }
       *y_pattern_len = y_pattern_len_l;
-      *y_pattern = hitomezashi_cli_ascii_binary_str_to_ints(options.optarg,
-                                                            *y_pattern_len);
+      *y_pattern =
+          hitomezashi_ascii_binary_str_to_ints(options.optarg, *y_pattern_len);
       if (!*y_pattern) {
         SDL_LogCritical(SDL_LOG_CATEGORY_ERROR, "Invalid y pattern; see -h");
         exit(Hitomezashi_Cli_Exit_Code_Err_Handle_Args);
diff --git a/cli/hitomezashi_cli.h b/cli/hitomezashi_cli.h
index 9f7825c..3c6b9bf 100644
--- a/cli/hitomezashi_cli.h
+++ b/cli/hitomezashi_cli.h
@@ -37,8 +37,5 @@ void hitomezashi_cli_handle_args(char **out_file_path, int *x_pattern_len,
  * Hitomezashi_Cli_Exit_Code_Print_Help (2) on failure.
  */
 void hitomezashi_cli_help(void);
-/** Convert a string composed of ASCII 0 and 1 digits, eg\. "01010", to an array
- * of numeric 0s and 1s stored as char. */
-char *hitomezashi_cli_ascii_binary_str_to_ints(char *ascii_str, size_t n);
 
 #endif // HITOMEZASHI_CLI_H