Add examples build step and remove bfc step

2 files changed, 32 insertions, 12 deletions

diff --git a/README.md b/README.md
index a92a0f4..6e0b1af 100644
--- a/README.md
+++ b/README.md
@@ -27,3 +27,9 @@ Options:
   -c               Compile and assemble, but do not link.
   -s               Strip the output file.
 ```
+
+todo
+----
+- add sighandler to remove temporary files
+- use an IR to do more optimization
+- support more targets
diff --git a/build.zig b/build.zig
index 91d33f8..8b45eb1 100644
--- a/build.zig
+++ b/build.zig
@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub fn build(b: *std.Build) void {
+pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
@@ -28,21 +28,35 @@ pub fn build(b: *std.Build) void {
     bf.strip = true;
     b.installArtifact(bf);
 
-    const bfc_cmd = b.addRunArtifact(bfc);
-    bfc_cmd.step.dependOn(b.getInstallStep());
+    const run_cmd = b.addRunArtifact(bf);
+    run_cmd.step.dependOn(b.getInstallStep());
     if (b.args) |args| {
-        bfc_cmd.addArgs(args);
+        run_cmd.addArgs(args);
     }
-    const bfc_step = b.step("bfc", "Compile a brainfuck program with bfc");
-    bfc_step.dependOn(&bfc_cmd.step);
+    const run_step = b.step("run", "Run a brainfuck program");
+    run_step.dependOn(&run_cmd.step);
 
-    const bf_cmd = b.addRunArtifact(bf);
-    bf_cmd.step.dependOn(b.getInstallStep());
-    if (b.args) |args| {
-        bf_cmd.addArgs(args);
+    const examples_step = b.step("examples", "Compile all the examples");
+    examples_step.dependOn(b.getInstallStep());
+    const cwd = std.fs.cwd();
+    try cwd.makePath("./zig-out/examples");
+    var examples_dir = try cwd.openIterableDir("./examples", .{});
+    defer examples_dir.close();
+    var examples_iterator = examples_dir.iterate();
+    while (try examples_iterator.next()) |file| {
+        const example_cmd = b.addRunArtifact(bfc);
+        const in = try std.fmt.allocPrint(b.allocator, "./examples/{s}", .{file.name});
+        const out = try std.fmt.allocPrint(
+            b.allocator,
+            "./zig-out/examples/{s}",
+            // trim .o assuming there is only source files
+            .{file.name[0..file.name.len - 2]}
+        );
+        example_cmd.addArgs(&[_][]const u8{ "-s", "-o", out, in });
+        examples_step.dependOn(&example_cmd.step);
+        b.allocator.free(in);
+        b.allocator.free(out);
     }
-    const bf_step = b.step("bf", "Interprete a brainfuck program with bf");
-    bf_step.dependOn(&bf_cmd.step);
 
     const clean_step = b.step("clean", "Delete all artifacts created by zig build");
     clean_step.dependOn(&b.addRemoveDirTree("zig-cache").step);