cli version support

cli/build.zig

@@ -2,6 +2,21 @@ const std = @import("std");
 
 const compile = @import("compile.zig");
 
+fn getGitHash(allocator: std.mem.Allocator) ![]const u8 {
+    const args = &[_][]const u8{ "git", "rev-parse", "--short=10", "HEAD" };
+    const proc = try std.process.Child.run(.{
+        .allocator = allocator,
+        .argv = args,
+    });
+    defer allocator.free(proc.stderr);
+
+    const trimmed = std.mem.trim(u8, proc.stdout, &std.ascii.whitespace);
+    const hash = try allocator.alloc(u8, trimmed.len);
+    std.mem.copyForwards(u8, hash, trimmed);
+    allocator.free(proc.stdout);
+    return hash;
+}
+
 pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
@@ -24,6 +39,24 @@ pub fn build(b: *std.Build) !void {
     exe.root_module.addImport("args", zig_args_dep.module("args"));
     exe.root_module.addImport("init_data", try compile.initDataModule(b));
 
+    const version_config = @import("build.zig.zon");
+    const version_str = version_config.version;
+    const raw_hash = try getGitHash(b.allocator);
+    defer b.allocator.free(raw_hash);
+    const hash = std.mem.trim(u8, raw_hash, &std.ascii.whitespace);
+    var content = std.ArrayList(u8).init(b.allocator);
+    defer content.deinit();
+    try content.appendSlice("pub const version = \"");
+    try content.appendSlice(version_str);
+    try content.appendSlice("\";\n");
+    try content.appendSlice("pub const commit_hash = \"");
+    try content.appendSlice(hash);
+    try content.appendSlice("\";\n");
+    const write_files = b.addWriteFiles();
+    const version_src = write_files.add("version.zig", content.items);
+    const version_module = b.createModule(.{ .root_source_file = version_src });
+    exe.root_module.addImport("version", version_module);
+
     b.installArtifact(exe);
 
     const run_cmd = b.addRunArtifact(exe);

cli/cli.zig

@@ -10,6 +10,7 @@ pub const bundle = @import("commands/bundle.zig");
 pub const tests = @import("commands/tests.zig");
 pub const database = @import("commands/database.zig");
 pub const auth = @import("commands/auth.zig");
+pub const version = @import("commands/version.zig");
 
 pub const Environment = enum { development, testing, production };
 
@@ -49,6 +50,7 @@ const Verb = union(enum) {
     @"test": tests.Options,
     database: database.Options,
     auth: auth.Options,
+    version: version.Options,
     g: generate.Options,
     s: server.Options,
     r: routes.Options,
@@ -91,6 +93,7 @@ pub fn main() !void {
             \\  database     Manage the application's database.
             \\  auth         Utilities for Jetzig authentication.
             \\  test         Run app tests.
+            \\  version      Print Jetzig version.
             \\
             \\ Pass --help to any command for more information, e.g. `jetzig init --help`
             \\
@@ -124,6 +127,13 @@ fn run(allocator: std.mem.Allocator, options: args.ParseArgsResult(Options, Verb
                 OptionsType,
                 options,
             ),
+            .version => |opts| version.run(
+                allocator,
+                opts,
+                writer,
+                OptionsType,
+                options,
+            ),
             .s, .server => |opts| server.run(
                 allocator,
                 opts,

cli/commands/version.zig

@@ -0,0 +1,26 @@
+const std = @import("std");
+const args = @import("args");
+const version = @import("version");
+
+/// Command line options for the `version` command.
+pub const Options = struct {
+    pub const meta = .{
+        .usage_summary = "",
+        .full_text = "Print Jetzig version.",
+    };
+};
+
+/// Run the `jetzig version` command.
+pub fn run(
+    _: std.mem.Allocator,
+    _: Options,
+    writer: anytype,
+    T: type,
+    main_options: T,
+) !void {
+    if (main_options.options.help) {
+        try args.printHelp(Options, "jetzig version", writer);
+        return;
+    }
+    std.debug.print("{s}+{s}\n", .{ version.version, version.commit_hash });
+}