tiny.smg.git

1const std = @import("std");23pub const Output = struct {4    ok: bool,5    stdout: []const u8,6    stderr: []const u8,7};89pub fn run(allocator: std.mem.Allocator, root: []const u8, argv: []const []const u8, limit: usize) !Output {10    var io_state = std.Io.Threaded.init(allocator, .{});11    defer io_state.deinit();12    const result = std.process.run(allocator, io_state.io(), .{13        .argv = argv,14        .cwd = .{ .path = root },15        .expand_arg0 = .expand,16        .stdout_limit = .limited(limit),17        .stderr_limit = .limited(limit),18    }) catch return .{ .ok = false, .stdout = "", .stderr = "" };19    return .{20        .ok = switch (result.term) {21            .exited => |code| code == 0,22            else => false,23        },24        .stdout = result.stdout,25        .stderr = result.stderr,26    };27}2829pub fn refExists(allocator: std.mem.Allocator, root: []const u8, ref: []const u8) !bool {30    const commit_ref = try std.fmt.allocPrint(allocator, "{s}^{{commit}}", .{ref});31    const output = try run(allocator, root, &.{ "git", "rev-parse", "--verify", "--quiet", commit_ref }, 1024 * 1024);32    return output.ok;33}3435test "run captures successful command output" {36    var arena = std.heap.ArenaAllocator.init(std.testing.allocator);37    defer arena.deinit();38    const output = try run(arena.allocator(), ".", &.{ "git", "--version" }, 1024);39    try std.testing.expect(output.ok);40    try std.testing.expect(std.mem.startsWith(u8, output.stdout, "git version"));41}4243test "run reports process launch failure as not ok" {44    var arena = std.heap.ArenaAllocator.init(std.testing.allocator);45    defer arena.deinit();46    const output = try run(arena.allocator(), ".", &.{"smg-definitely-missing-command"}, 1024);47    try std.testing.expect(!output.ok);48    try std.testing.expectEqualStrings("", output.stdout);49    try std.testing.expectEqualStrings("", output.stderr);50}

1pub const git = @import("git.zig");