Add build flags for codegen and rebuild; Check timestamps

1 files changed, 328 insertions, 221 deletions

diff --git a/saw.c b/saw.c
index 9ab93ec..6560fe0 100755
--- a/saw.c
+++ b/saw.c
@@ -15,14 +15,39 @@
 #/  - No configuration required
 #/  - Cross-platform thanks to sokol and miniaudio
 #/
-#/    NOTE
-#/    You can build the project easily using this two commands:
-#/    > gcc -o buildme -DBUILDME saw.c
+#/  ----------------------------------------------------------------
+#/
+#/    NOTE Automatic self-compilation
+#/
+#/    If you have a Linux shell, you can build the project by running
+#/    > ./saw.c
+#/
+#/    Or you can build the project easily using those two commands:
+#/    > gcc -o buildme -DBUILDME=1 saw.c
 #/    > ./buildme
 #/    Or, on Windows, with MSVC compiler:
-#/    > cl.exe -Febuildme.exe -DBUILDME saw.c
+#/    > cl.exe -Febuildme.exe -DBUILDME=1 saw.c
 #/    > buildme.exe
 #/
+#/    NOTE Manual compilation
+#/
+#/    - Code generation
+#/      > gcc -o build_codegen -DCODEGEN=1 saw.c
+#/      > ./build_codegen
+#/
+#/    - Dependencies
+#/      > gcc -c -o build/thirdparty.o -DDEPENDENCIES=1 saw.c
+#/
+#/    - Test suite
+#/      > gcc -o build/test_suite -DTESTS=1
+#/      > build/test_suite
+#/
+#/    - Executable
+#/      > gcc -o build/saw -DEXE=1
+#/      > build/saw
+#/
+#/  ----------------------------------------------------------------
+#/
 #/  To-Do list
 #/
 #/  - Code
@@ -143,11 +168,12 @@ exit $? # */
 //
 //  ================================================================
 //  Define one of the options for the linter
-#if !BUILDME      && \
+#if !CODEGEN      && \
+    !BUILDME      && \
     !DEPENDENCIES && \
     !EXE          && \
     !TESTS
-#define EXE 1
+#define BUILDME 1
 #endif
 #define _GNU_SOURCE
 //  ================================================================
@@ -156,19 +182,153 @@ exit $? # */
 //
 //  ================================================================
 
-#if BUILDME
+#if CODEGEN || BUILDME
 
-typedef int         i32;
-typedef long long   i64;
-typedef unsigned    u32;
-typedef char        c8;
-typedef signed char b8;
+enum {
+  LINUX,
+  WINDOWS,
+  MACOS,
+};
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#define DLM "\\"
+#define OS WINDOWS
+#elif defined(__APPLE__)
+#define DLM "/"
+#define OS MACOS
+#else // assume Linux
+#define DLM "/"
+#define OS LINUX
+#endif
+
+#define FONT_TEXT  "fonts" DLM "domitian_roman.ttf"
+#define FONT_ICONS "fonts" DLM "font_awesome_6_free_solid_900.ttf"
+#define INL_FONTS  "build_fonts.inl.c"
+#define SOURCE     "saw.c"
+#define PROJECT    "saw"
+
+typedef int                i32;
+typedef long long          i64;
+typedef unsigned           u32;
+typedef unsigned long long u64;
+typedef char               c8;
+typedef signed char        b8;
 
 #include <stdio.h>
 #include <stdlib.h>
+
+enum {
+  MAX_LENGTH = 200,
+};
+
+i64 int_len(u32 x) {
+  i64 len = 0;
+
+  do {
+    x /= 10;
+    ++len;
+  } while (x > 0);
+
+  return len;
+}
+
+i64 print_bytes(FILE *out, FILE *in) {
+  i64 size = 0, line_len = MAX_LENGTH;
+
+  while (!feof(in)) {
+    u32 x = 0;
+
+    i64 n = fread(&x, 1, sizeof x, in);
+    if (n <= 0)
+      break;
+
+    i64 len = int_len(x);
+
+    line_len += len + 2;
+
+    if (line_len >= MAX_LENGTH) {
+      fprintf(out, "\n ");
+      line_len = 3 + len;
+    }
+
+    fprintf(out, " %u,", x);
+
+    size += n;
+  }
+
+  return size;
+}
+
+void codegen() {
+  printf("Code generation\n");
+  fflush(stdout);
+
+  FILE *out = fopen(INL_FONTS, "wb");
+
+  if (out == NULL) {
+    printf("Unable to write `%s`", INL_FONTS);
+    exit(-1);
+  }
+
+  fprintf(out, "//  Saw generated code\n\n");
+  fprintf(out, "#include \"kit/types.h\"\n\n");
+
+  {
+    FILE *in = fopen(FONT_TEXT, "rb");
+
+    if (in == NULL) {
+      printf("Unable to read `%s`", FONT_TEXT);
+      exit(-1);
+    }
+
+    fprintf(out, "u32 ttf_text[] = {");
+
+    i64 n = print_bytes(out, in);
+
+    fprintf(out, "\n};\n\n");
+    fprintf(out, "enum { TTF_TEXT_SIZE = %lld, };\n\n", n);
+
+    fclose(in);
+  }
+
+  {
+    FILE *in = fopen(FONT_ICONS, "rb");
+
+    if (in == NULL) {
+      printf("Unable to read `%s`", FONT_ICONS);
+      exit(-1);
+    }
+
+
+    fprintf(out, "u32 ttf_icons[] = {");
+
+    i64 n = print_bytes(out, in);
+
+    fprintf(out, "\n};\n\n");
+    fprintf(out, "enum { TTF_ICONS_SIZE = %lld, };\n\n", n);
+
+    fclose(in);
+  }
+
+  fclose(out);
+}
+
+#endif
+
+#if CODEGEN
+
+int main(int argc, char **argv) {
+  (void) argc;
+  (void) argv;
+
+  codegen();
+  return 0;
+}
+
+#elif BUILDME
+
 #include <string.h>
 #include <stdarg.h>
-#include <assert.h>
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #  define WIN32_LEAN_AND_MEAN
@@ -178,9 +338,6 @@ typedef signed char b8;
 #  include <sys/stat.h>
 #endif
 
-#define PROJECT "saw"
-#define SOURCE  "saw.c"
-
 #define REQUIRE_MATH     1
 #define REQUIRE_DL       0
 #define REQUIRE_THREADS  0
@@ -197,23 +354,6 @@ typedef signed char b8;
 //  TODO Add command line option for the C runtime.
 
 enum {
-  LINUX,
-  WINDOWS,
-  MACOS,
-};
-
-#if defined(_WIN32) && !defined(__CYGWIN__)
-#define DLM "\\"
-#define OS WINDOWS
-#elif defined(__APPLE__)
-#define DLM "/"
-#define OS MACOS
-#else // assume Linux
-#define DLM "/"
-#define OS LINUX
-#endif
-
-enum {
   BUFFER_COUNT = 16,
   BUFFER_SIZE  = 512,
   STRING_COUNT = 64,
@@ -238,7 +378,11 @@ c8 *flag_exe           = "-o ";
 c8 *flags              = "";
 c8 *link_flags         = "";
 
-b8 run_tests = 1;
+b8 rebuild_all  = 0;
+b8 rebuild_exe  = 0;
+b8 run_codegen  = 0;
+b8 run_tests    = 1;
+b8 run_exe      = 0;
 
 void print_help(void) {
   printf(
@@ -250,7 +394,11 @@ void print_help(void) {
     "  -d  --destination  - Set destination path\n"
     "  -o  --options      - Set additional compiler options\n"
     "  -l  --link         - Set additional linker options\n"
-    "  -s  --skiptests    - Do not run tests\n\n"
+    "  -e  --rebuild      - Rebuild executable\n"
+    "  -r  --rebuildall   - Rebuild dependencies\n"
+    "  -g  --codegen      - Run code generation\n"
+    "  -s  --skiptests    - Do not run tests\n"
+    "  -x  --run          - Run the executable\n\n"
   );
   fflush(stdout);
 }
@@ -264,7 +412,10 @@ c8 lowercase_char(c8 c) {
 c8 *lowercase(c8 *s) {
   i32 i = 0;
   for (; s[i] != '\0'; ++i) {
-    assert(i + 1 < BUFFER_SIZE);
+    if (i + 1 >= BUFFER_SIZE) {
+      printf("Buffer overflow\n");
+      exit(-1);
+    }
     _buffers[_buffer_index][i] = lowercase_char(s[i]);
   }
   _buffers[_buffer_index][i] = '\0';
@@ -294,7 +445,10 @@ void fmt_dup_v(c8 *format, va_list args) {
 c8 *fmt_dup(c8 *format, ...) {
   va_list args;
   va_start(args, format);
-  assert(_string_index < STRING_COUNT);
+  if (_string_index >= STRING_COUNT) {
+    printf("Buffer overflow\n");
+    exit(-1);
+  }
   fmt_v(format, args);
   c8 *result = _strings[_string_index++];
   va_end(args);
@@ -334,6 +488,52 @@ b8 file_exists(c8 *name) {
   return 0;
 }
 
+typedef struct {
+  u64 seconds;
+  u32 nanoseconds;
+} Timestamp;
+
+Timestamp file_timestamp(c8 *name) {
+  Timestamp time = {
+    .seconds     = 0,
+    .nanoseconds = 0,
+  };
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  HANDLE    f = CreateFileA(buf, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+  FILETIME  ft;
+  if (f != INVALID_HANDLE_VALUE && GetFileTime(f, NULL, NULL, &ft) != 0) {
+    u64 nsec100 = (((u64) ft.dwHighDateTime) << 32) | (u64) ft.dwLowDateTime;
+    time = (Timestamp) {
+      .seconds     = (u64) (nsec100 / 10000000),
+      .nanoseconds = (u32) (100 * (nsec100 % 10000000)),
+    };
+  }
+  if (f != INVALID_HANDLE_VALUE)
+    CloseHandle(f);
+#else
+  struct stat info;
+  if (stat(name, &info) == 0 && (S_ISREG(info.st_mode) || S_ISDIR(info.st_mode)))
+    time = (Timestamp) {
+    #ifdef st_mtime
+      .seconds     = (u64) info.st_mtim.tv_sec,
+      .nanoseconds = (u32) info.st_mtim.tv_nsec,
+    #else
+      .seconds     = (u64) info.st_mtime,
+      .nanoseconds = 0,
+    #endif
+    };
+#endif
+
+  return time;
+}
+
+b8 time_less(Timestamp a, Timestamp b) {
+  if (a.seconds == b.seconds)
+    return a.nanoseconds < b.nanoseconds;
+  return a.seconds < b.seconds;
+}
+
 void create_folder_recursive(c8 *path) {
   #if defined(_WIN32) && !defined(__CYGWIN__)
   system(fmt("if not exist %s mkdir %s", destination, destination));
@@ -342,48 +542,6 @@ void create_folder_recursive(c8 *path) {
   #endif
 }
 
-enum {
-  MAX_LENGTH = 200,
-};
-
-i64 int_len(u32 x) {
-  i64 len = 0;
-
-  do {
-    x /= 10;
-    ++len;
-  } while (x > 0);
-
-  return len;
-}
-
-i64 print_bytes(FILE *out, FILE *in) {
-  i64 size = 0, line_len = MAX_LENGTH;
-
-  while (!feof(in)) {
-    u32 x = 0;
-
-    i64 n = fread(&x, 1, sizeof x, in);
-    if (n <= 0)
-      break;
-
-    i64 len = int_len(x);
-
-    line_len += len + 2;
-
-    if (line_len >= MAX_LENGTH) {
-      fprintf(out, "\n ");
-      line_len = 3 + len;
-    }
-
-    fprintf(out, " %u,", x);
-
-    size += n;
-  }
-
-  return size;
-}
-
 i32 main(i32 argc, c8 **argv) {
   //  Handle command line arguments
   //
@@ -409,8 +567,16 @@ i32 main(i32 argc, c8 **argv) {
           extra_options = argv[++i];
         else if (str_eq_lower(opt, "link"))
           extra_link_options = argv[++i];
+        else if (str_eq_lower(opt, "rebuild"))
+          rebuild_exe = 1;
+        else if (str_eq_lower(opt, "rebuildall"))
+          rebuild_all = 1;
+        else if (str_eq_lower(opt, "codegen"))
+          run_codegen = 1;
         else if (str_eq_lower(opt, "skiptests"))
           run_tests = 0;
+        else if (str_eq_lower(opt, "run"))
+          run_exe = 1;
         else
           printf("Unknown option ignored `%s`\n", argv[i]);
       } else {
@@ -422,29 +588,16 @@ i32 main(i32 argc, c8 **argv) {
               print_help();
               return 0;
 
-            case 't':
-              build_type = argv[i + (++consumed)];
-              break;
-
-            case 'c':
-              compiler_c = argv[i + (++consumed)];
-              break;
-
-            case 'd':
-              destination = argv[i + (++consumed)];
-              break;
-
-            case 'o':
-              extra_options = argv[i + (++consumed)];
-              break;
-
-            case 'l':
-              extra_link_options = argv[i + (++consumed)];
-              break;
-
-            case 's':
-              run_tests = 0;
-              break;
+            case 't': build_type         = argv[i + (++consumed)]; break;
+            case 'c': compiler_c         = argv[i + (++consumed)]; break;
+            case 'd': destination        = argv[i + (++consumed)]; break;
+            case 'o': extra_options      = argv[i + (++consumed)]; break;
+            case 'l': extra_link_options = argv[i + (++consumed)]; break;
+            case 'e': rebuild_exe        = 1;                      break;
+            case 'r': rebuild_all        = 1;                      break;
+            case 'g': run_codegen        = 1;                      break;
+            case 's': run_tests          = 0;                      break;
+            case 'x': run_exe            = 1;                      break;
 
             default:
               printf("Unknown option ignored `-%c`\n", argv[i][j]);
@@ -452,9 +605,8 @@ i32 main(i32 argc, c8 **argv) {
         }
         i += consumed;
       }
-    } else {
+    } else
       printf("Unknown option ignored `%s`\n", argv[i]);
-    }
   }
 
   fflush(stdout);
@@ -629,9 +781,9 @@ i32 main(i32 argc, c8 **argv) {
       "";
 
   if (extra_options[0] != '\0')
-    flags      = fmt_dup("%s %s", extra_options, flags);
+    flags      = fmt_dup("%s %s", flags, extra_options);
   if (extra_link_options[0] != '\0')
-    link_flags = fmt_dup("%s %s", extra_link_options, link_flags);
+    link_flags = fmt_dup("%s %s", link_flags, extra_link_options);
 
   //  Prepare destination folder
   //
@@ -639,82 +791,43 @@ i32 main(i32 argc, c8 **argv) {
   destination[0] == '\0' && (destination = "build");
   create_folder_recursive(destination);
 
-  //  Print info
-  //
-
-  printf("\nCompiler options: %s\n",   flags);
-  printf(  "Link options:     %s\n\n",   link_flags);
-  fflush(stdout);
-
-  //  Code generation
+  //  Check timestamps
   //
-  //  TODO Add command line option for code generation.
-
-  if (!file_exists("build_fonts.inl.h")) {
-    printf("Code generation\n");
-    fflush(stdout);
-
-    FILE *out = fopen("build_fonts.inl.h", "wb");
-    assert(out != NULL);
-
-    fprintf(out, "//  "
-                 "====================================================="
-                 "===========\n");
-    fprintf(out, "//\n");
-    fprintf(out, "//  Saw generated code\n");
-    fprintf(out, "//\n");
-    fprintf(out, "//  "
-                 "====================================================="
-                 "===========\n\n");
-
-    fprintf(out, "#ifndef BUILD_FONTS_INL_H\n");
-    fprintf(out, "#define BUILD_FONTS_INL_H\n\n");
-    fprintf(out, "#include \"kit/types.h\"\n\n");
-
-    //  Write Domitian Roman
-    //
-    {
-      FILE *in = fopen("fonts/domitian_roman.ttf", "rb");
-      assert(in != NULL);
 
-      fprintf(out, "u32 ttf_text[] = {");
+  Timestamp time_font_text  = file_timestamp(FONT_TEXT);
+  Timestamp time_font_icons = file_timestamp(FONT_ICONS);
+  Timestamp time_fonts      = file_timestamp(INL_FONTS);
+  Timestamp time_source     = file_timestamp(SOURCE);
+  Timestamp time_tests      = file_timestamp(fmt("%s" DLM "test_suite", destination));
+  Timestamp time_exe        = file_timestamp(fmt("%s" DLM PROJECT, destination));
 
-      i64 n = print_bytes(out, in);
+  if (time_less(time_fonts, time_font_text)  ||
+      time_less(time_fonts, time_font_icons))
+    run_codegen = 1;
 
-      fprintf(out, "\n};\n\n");
-      fprintf(out, "enum { TTF_TEXT_SIZE = %lld, };\n\n", n);
-
-      fclose(in);
-    }
-
-    //  Write Font Awesome
-    //
-    {
-      FILE *in = fopen("fonts/font_awesome_6_free_solid_900.ttf", "rb");
-      assert(in != NULL);
-
-      fprintf(out, "u32 ttf_icons[] = {");
-
-      i64 n = print_bytes(out, in);
+  if (!file_exists(fmt("%s" DLM "thirdparty%s", destination, postfix_obj))) {
+    rebuild_all = 1;
+    rebuild_exe = 1;
+  }
 
-      fprintf(out, "\n};\n\n");
-      fprintf(out, "enum { TTF_ICONS_SIZE = %lld, };\n\n", n);
+  if (time_less(time_tests, time_source) ||
+      time_less(time_exe, time_source))
+    rebuild_exe = 1;
 
-      fclose(in);
-    }
+  //  Print info
+  //
 
-    fprintf(out, "#endif\n");
-    fclose(out);
-  }
+  printf("\nCompiler options: %s\n",   flags);
+  printf(  "Link options:     %s\n\n",   link_flags);
+  fflush(stdout);
 
   //  Build the project
   //
 
-  c8 *deps = fmt("%s" DLM "thirdparty%s", destination, postfix_obj);
-
-  if (!file_exists(deps)) {
-    //  TODO  Add command line option for complete rebuild.
+  if (run_codegen)
+    codegen();
 
+  if (rebuild_all) {
     printf("Rebuild dependencies\n");
     fflush(stdout);
 
@@ -733,65 +846,59 @@ i32 main(i32 argc, c8 **argv) {
     fflush(stdout);
   }
 
-  printf("Build the test suite\n");
-  fflush(stdout);
-
-  i32 s = system(fmt(
-    "%s %s -DTESTS=1 "
-    "%s%s" DLM "test_suite%s "
-    SOURCE
-    " %s",
-    compiler_c, flags,
-    flag_exe, destination, postfix_exe,
-    link_flags)
-  );
-
-  if (WEXITSTATUS(s) != 0)
-    return 1;
-  fflush(stdout);
-
-  printf("Build " PROJECT " executable\n");
-  fflush(stdout);
+  if (rebuild_exe) {
+    printf("Build the test suite\n");
+    fflush(stdout);
 
-  s = system(fmt(
-    "%s %s -DEXE=1 "
-    "%s%s" DLM PROJECT "%s "
-    "%s" DLM "thirdparty%s "
-    SOURCE
-    " %s",
-    compiler_c, flags,
-    flag_exe, destination, postfix_exe,
-    destination, postfix_obj,
-    link_flags)
-  );
+    i32 s = system(fmt(
+      "%s %s -DTESTS=1 "
+      "%s%s" DLM "test_suite%s "
+      SOURCE
+      " %s",
+      compiler_c, flags,
+      flag_exe, destination, postfix_exe,
+      link_flags)
+    );
 
-  if (WEXITSTATUS(s) != 0)
-    return 1;
-  fflush(stdout);
+    if (WEXITSTATUS(s) != 0)
+      return 1;
+    fflush(stdout);
 
-  if (!run_tests)
-    return 0;
+    printf("Build " PROJECT " executable\n");
+    fflush(stdout);
 
-  //  Run tests
-  //
+    s = system(fmt(
+      "%s %s -DEXE=1 "
+      "%s%s" DLM PROJECT "%s "
+      "%s" DLM "thirdparty%s "
+      SOURCE
+      " %s",
+      compiler_c, flags,
+      flag_exe, destination, postfix_exe,
+      destination, postfix_obj,
+      link_flags)
+    );
 
-  i32 status = 0;
+    if (WEXITSTATUS(s) != 0)
+      return 1;
+    fflush(stdout);
+  }
 
-  printf("Run tests\n\n");
-  fflush(stdout);
+  if (run_tests) {
+    printf("Run tests\n");
+    fflush(stdout);
 
-  s = system(fmt("\"%s" DLM "test_suite\"", destination));
+    i32 s = system(fmt("\"%s" DLM "test_suite\"", destination));
 
-  if (WEXITSTATUS(s) != 0)
-    status = 1;
-  fflush(stdout);
+    if (WEXITSTATUS(s) != 0)
+      return -1;
+  }
 
-  if (status == 0)
-    printf("\nAll done - OK.\n");
-  else
-    printf("\nAll done - FAILURE.\n");
+  if (run_exe)
+    system(fmt("\"%s" DLM PROJECT "\"", destination));
 
-  return status;
+  printf("All done\n");
+  return 0;
 }
 
 //  ================================================================
@@ -882,7 +989,7 @@ i32 main(i32 argc, c8 **argv) {
 
 //  ttf_text,  TTF_TEXT_SIZE
 //  ttf_icons, TTF_ICONS_SIZE
-#include "build_fonts.inl.h"
+#include "build_fonts.inl.c"
 
 //  ================================================================
 //
@@ -4724,5 +4831,5 @@ i32 main(i32 argc, char **argv) {
 //  ================================================================
 
 #else
-#error Build options not provided. Try: gcc -DBUILDME saw.c
+#error Build options not provided. Try: gcc -DBUILDME=1 saw.c
 #endif