c api: add ghostty_info to get metadata about the build

include/ghostty.h

@@ -284,9 +284,22 @@ typedef struct {
     bool physical;
 } ghostty_input_trigger_s;
 
+typedef enum {
+    GHOSTTY_BUILD_MODE_DEBUG,
+    GHOSTTY_BUILD_MODE_RELEASE_SAFE,
+    GHOSTTY_BUILD_MODE_RELEASE_FAST,
+    GHOSTTY_BUILD_MODE_RELEASE_SMALL,
+} ghostty_build_mode_e;
+
 // Fully defined types. This MUST be kept in sync with equivalent Zig
 // structs. To find the Zig struct, grep for this type name. The documentation
 // for all of these types is available in the Zig source.
+typedef struct {
+    ghostty_build_mode_e build_mode;
+    const char *version;
+    uintptr_t version_len;
+} ghostty_info_s;
+
 typedef struct {
     const char *message;
 } ghostty_error_s;
@@ -338,6 +351,7 @@ typedef struct {
 // Published API
 
 int ghostty_init(void);
+ghostty_info_s ghostty_info(void);
 
 ghostty_config_t ghostty_config_new();
 void ghostty_config_free(ghostty_config_t);

src/main_c.zig

@@ -9,6 +9,7 @@
 const std = @import("std");
 const assert = std.debug.assert;
 const builtin = @import("builtin");
+const build_config = @import("build_config.zig");
 const main = @import("main.zig");
 const apprt = @import("apprt.zig");
 
@@ -23,6 +24,20 @@ pub const std_options = main.std_options;
 pub usingnamespace @import("config.zig").CAPI;
 pub usingnamespace apprt.runtime.CAPI;
 
+/// ghostty_info_s
+const Info = extern struct {
+    mode: BuildMode,
+    version: [*]const u8,
+    version_len: usize,
+
+    const BuildMode = enum(c_int) {
+        debug,
+        release_safe,
+        release_fast,
+        release_small,
+    };
+};
+
 /// Initialize ghostty global state. It is possible to have more than
 /// one global state but it has zero practical benefit.
 export fn ghostty_init() c_int {
@@ -30,3 +45,16 @@ export fn ghostty_init() c_int {
     main.state.init();
     return 0;
 }
+
+export fn ghostty_info() Info {
+    return .{
+        .mode = switch (builtin.mode) {
+            .Debug => .debug,
+            .ReleaseSafe => .release_safe,
+            .ReleaseFast => .release_fast,
+            .ReleaseSmall => .release_small,
+        },
+        .version = build_config.version_string.ptr,
+        .version_len = build_config.version_string.len,
+    };
+}