Initial commit

src/builtin/builtin.zig

@@ -0,0 +1,54 @@
+const std = @import("std");
+
+const parser = @import("../shell/parser.zig");
+
+const cd = @import("cmds/cd.zig");
+const echo = @import("cmds/echo.zig");
+const exit = @import("cmds/exit.zig");
+const pwd = @import("cmds/pwd.zig");
+const run = @import("cmds/run.zig");
+
+pub const Shell = struct {
+    running: bool = true,
+    interrupted: bool = false,
+    environ: *const std.process.Environ.Map,
+};
+
+pub fn execute(
+    io: std.Io,
+    allocator: std.mem.Allocator,
+    shell: *Shell,
+    command: parser.Command,
+) !bool {
+    if (command.argv.len == 0)
+        return true;
+
+    const name = command.argv[0];
+
+    if (std.mem.eql(u8, name, "cd")) {
+        try cd.execute(io, shell.environ, command.argv);
+        return true;
+    }
+
+    if (std.mem.eql(u8, name, "pwd")) {
+        try pwd.execute(io, allocator);
+        return true;
+    }
+
+    if (std.mem.eql(u8, name, "run")) {
+        try run.execute(io, allocator, command.argv);
+        return true;
+    }
+
+    if (std.mem.eql(u8, name, "echo")) {
+        try echo.execute(io, command.argv);
+        return true;
+    }
+
+    if (std.mem.eql(u8, name, "exit")) {
+        exit.execute(&shell.running);
+        return true;
+    }
+
+    return false;
+}