libghostty-vt: allow version to be customized from the Zig build command

build.zig

@@ -7,7 +7,7 @@ const buildpkg = @import("src/build/main.zig");
 const app_zon_version = @import("build.zig.zon").version;
 
 /// Libghostty version. We use a separate version from the app.
-const lib_version = "0.1.0";
+const lib_version = "0.1.0-dev";
 
 /// Minimum required zig version.
 const minimum_zig_version = @import("build.zig.zon").minimum_zig_version;
@@ -37,6 +37,7 @@ pub fn build(b: *std.Build) !void {
     const config = try buildpkg.Config.init(
         b,
         file_version orelse app_zon_version,
+        lib_version,
     );
     const test_filters = b.option(
         [][]const u8,

nix/libghostty-vt.nix

@@ -11,7 +11,7 @@
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "ghostty";
-  version = "0.1.0-dev";
+  version = "0.1.0-dev+${revision}-nix";
 
   # We limit source like this to try and reduce the amount of rebuilds as possible
   # thus we only provide the source that is needed for the build
@@ -51,7 +51,7 @@ stdenv.mkDerivation (finalAttrs: {
   zigBuildFlags = [
     "--system"
     "${finalAttrs.deps}"
-    "-Dversion-string=${finalAttrs.version}-${revision}-nix"
+    "-Dlib-version-string=${finalAttrs.version}"
     "-Dcpu=baseline"
     "-Doptimize=${optimize}"
     "-Dapp-runtime=none"

src/build/Config.zig

@@ -38,6 +38,7 @@ wasm_shared: bool = true,
 /// Ghostty exe properties
 exe_entrypoint: ExeEntrypoint = .ghostty,
 version: std.SemanticVersion = .{ .major = 0, .minor = 0, .patch = 0 },
+lib_version: std.SemanticVersion = .{ .major = 0, .minor = 0, .patch = 0 },
 
 /// Binary properties
 pie: bool = false,
@@ -68,7 +69,7 @@ is_dep: bool = false,
 /// Environmental properties
 env: std.process.EnvMap,
 
-pub fn init(b: *std.Build, appVersion: []const u8) !Config {
+pub fn init(b: *std.Build, appVersion: []const u8, libVersion: []const u8) !Config {
     // Setup our standard Zig target and optimize options, i.e.
     // `-Doptimize` and `-Dtarget`.
     const optimize = b.standardOptimizeOption(.{});
@@ -294,6 +295,20 @@ pub fn init(b: *std.Build, appVersion: []const u8) !Config {
         };
     };
 
+    // libghostty-vt properties
+
+    const lib_version_string = b.option(
+        []const u8,
+        "lib-version-string",
+        "A specific version string to use for the build of libghostty-vt. " ++
+            "If not specified, git will be used. This must be a semantic version.",
+    );
+
+    config.lib_version = if (lib_version_string) |v|
+        try std.SemanticVersion.parse(v)
+    else
+        try std.SemanticVersion.parse(libVersion);
+
     //---------------------------------------------------------------
     // Binary Properties
 
@@ -519,13 +534,20 @@ pub fn addOptions(self: *const Config, step: *std.Build.Step.Options) !void {
     // Our version. We also add the string version so we don't need
     // to do any allocations at runtime. This has to be long enough to
     // accommodate realistic large branch names for dev versions.
-    var buf: [1024]u8 = undefined;
+    var app_version_buf: [1024]u8 = undefined;
     step.addOption(std.SemanticVersion, "app_version", self.version);
     step.addOption([:0]const u8, "app_version_string", try std.fmt.bufPrintZ(
-        &buf,
+        &app_version_buf,
         "{f}",
         .{self.version},
     ));
+    var lib_version_buf: [1024]u8 = undefined;
+    step.addOption(std.SemanticVersion, "lib_version", self.lib_version);
+    step.addOption([:0]const u8, "lib_version_string", try std.fmt.bufPrintZ(
+        &lib_version_buf,
+        "{f}",
+        .{self.lib_version},
+    ));
     step.addOption(
         ReleaseChannel,
         "release_channel",
@@ -539,13 +561,16 @@ pub fn addOptions(self: *const Config, step: *std.Build.Step.Options) !void {
 
 /// Returns the build options for the terminal module. This assumes a
 /// Ghostty executable being built. Callers should modify this as needed.
-pub fn terminalOptions(self: *const Config) TerminalBuildOptions {
+pub fn terminalOptions(self: *const Config, artifact: TerminalBuildOptions.Artifact) TerminalBuildOptions {
     return .{
-        .artifact = .ghostty,
+        .artifact = artifact,
         .simd = self.simd,
         .oniguruma = true,
         .c_abi = false,
-        .version = self.version,
+        .version = switch (artifact) {
+            .ghostty => self.version,
+            .lib => self.lib_version,
+        },
         .slow_runtime_safety = switch (self.optimize) {
             .Debug => true,
             .ReleaseSafe,

src/build/GhosttyLibVt.zig

@@ -40,7 +40,7 @@ pub fn initWasm(
     const exe = b.addExecutable(.{
         .name = "ghostty-vt",
         .root_module = zig.vt_c,
-        .version = std.SemanticVersion{ .major = 0, .minor = 1, .patch = 0 },
+        .version = zig.version,
     });
 
     // Allow exported symbols to actually be exported.
@@ -113,7 +113,7 @@ fn initLib(
         .name = if (kind == .static) "ghostty-vt-static" else "ghostty-vt",
         .linkage = linkage,
         .root_module = zig.vt_c,
-        .version = std.SemanticVersion{ .major = 0, .minor = 1, .patch = 0 },
+        .version = zig.version,
     });
     lib.installHeadersDirectory(
         b.path("include/ghostty"),
@@ -184,12 +184,12 @@ fn initLib(
             \\Name: libghostty-vt
             \\URL: https://github.com/ghostty-org/ghostty
             \\Description: Ghostty VT library
-            \\Version: 0.1.0
+            \\Version: {f}
             \\Cflags: -I${{includedir}}
             \\Libs: -L${{libdir}} -lghostty-vt
             \\Libs.private: {s}
             \\Requires.private: {s}
-        , .{ b.install_prefix, libsPrivate(zig), requiresPrivate(b) }));
+        , .{ b.install_prefix, zig.version, libsPrivate(zig), requiresPrivate(b) }));
     };
 
     // For static libraries with vendored SIMD dependencies, combine

src/build/GhosttyZig.zig

@@ -11,6 +11,9 @@ const TerminalBuildOptions = @import("../terminal/build_options.zig").Options;
 vt: *std.Build.Module,
 vt_c: *std.Build.Module,
 
+/// The libghostty-vt version
+version: std.SemanticVersion,
+
 /// Static library paths for vendored SIMD dependencies. Populated
 /// only when the dependencies are built from source (not provided
 /// by the system via -Dsystem-integration). Used to produce a
@@ -23,7 +26,7 @@ pub fn init(
     deps: *const SharedDeps,
 ) !GhosttyZig {
     // Terminal module build options
-    var vt_options = cfg.terminalOptions();
+    var vt_options = cfg.terminalOptions(.lib);
     vt_options.artifact = .lib;
     // We presently don't allow Oniguruma in our Zig module at all.
     // We should expose this as a build option in the future so we can
@@ -55,6 +58,8 @@ pub fn init(
             &simd_libs,
         ),
 
+        .version = cfg.lib_version,
+
         .simd_libs = simd_libs,
     };
 }

src/build/SharedDeps.zig

@@ -133,7 +133,7 @@ pub fn add(
     step.root_module.addOptions("build_options", self.options);
 
     // Every exe needs the terminal options
-    self.config.terminalOptions().add(b, step.root_module);
+    self.config.terminalOptions(.ghostty).add(b, step.root_module);
 
     // C imports for locale constants and functions
     {

src/terminal/build_options.zig

@@ -2,6 +2,14 @@ const std = @import("std");
 
 /// Options set by Zig build.zig and exposed via `terminal_options`.
 pub const Options = struct {
+    pub const Artifact = enum {
+        /// Ghostty application
+        ghostty,
+
+        /// libghostty-vt, Zig module
+        lib,
+    };
+
     /// The target artifact to build. This will gate some functionality.
     artifact: Artifact,
 
@@ -65,16 +73,9 @@ pub const Options = struct {
         opts.addOption(usize, "version_major", self.version.major);
         opts.addOption(usize, "version_minor", self.version.minor);
         opts.addOption(usize, "version_patch", self.version.patch);
+        opts.addOption(?[]const u8, "version_pre", self.version.pre);
         opts.addOption(?[]const u8, "version_build", self.version.build);
 
         m.addOptions("terminal_options", opts);
     }
 };
-
-pub const Artifact = enum {
-    /// Ghostty application
-    ghostty,
-
-    /// libghostty-vt, Zig module
-    lib,
-};