The OctaForge build system
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#include <utility>
#include <vector>
#include <stdexcept>
#include <ostd/string.hh>
#include <ostd/format.hh>
#include <ostd/path.hh>
#include <ostd/io.hh>
#include <ostd/platform.hh>
#include <ostd/environ.hh>
#include <ostd/argparse.hh>
#include <ostd/build/make.hh>
#include <ostd/build/make_coroutine.hh>
#include <cubescript/cubescript.hh>
namespace cs = cubescript;
namespace fs = ostd::fs;
namespace build = ostd::build;
static void rule_add(
cs::state &cs, build::make &mk,
std::string_view target, std::string_view depends,
cs::bcode_ref body, bool action = false
) {
build::make_rule::body_func bodyf{};
if (!body.empty()) {
bodyf = [body, &cs](auto tgt, auto srcs) {
auto ts = cs.new_thread();
cs::alias_local target{ts, ts.new_ident("target")};
cs::alias_local source{ts, ts.new_ident("source")};
cs::alias_local sources{ts, ts.new_ident("sources")};
if (!target) {
throw build::make_error{
"internal error: could not set alias 'target'"
};
}
cs::any_value idv{ts};
idv.set_str(tgt);
target.set(std::move(idv));
if (!srcs.empty()) {
if (!source) {
throw build::make_error{
"internal error: could not set alias 'source'"
};
}
if (!sources) {
throw build::make_error{
"internal error: could not set alias 'sources'"
};
}
idv.set_str(srcs[0]);
source.set(std::move(idv));
auto dsv = ostd::appender<std::string>();
ostd::format(dsv, "%(%s %)", srcs);
idv.set_str(dsv.get());
sources.set(std::move(idv));
}
try {
ts.run(body);
} catch (cs::error const &e) {
throw build::make_error{e.what()};
}
};
}
cs::list_parser p{cs, target};
while (p.parse()) {
cs::list_parser lp{cs, depends};
auto &r = mk.rule(
std::string_view{p.get_item()}
).action(action).body(bodyf);
while (lp.parse()) {
r.depend(std::string_view{lp.get_item()});
}
}
}
static void init_rulelib(cs::state &s, build::make &mk) {
s.new_command("rule", "sse", [&mk](auto &css, auto args, auto &) {
rule_add(
css, mk, args[0].get_str(), args[1].get_str(), args[2].get_code()
);
});
s.new_command("action", "se", [&mk](auto &css, auto args, auto &) {
rule_add(
css, mk, args[0].get_str(), std::string_view{},
args[1].get_code(), true
);
});
s.new_command("depend", "ss", [&mk](auto &css, auto args, auto &) {
rule_add(css, mk, args[0].get_str(), args[1].get_str(), nullptr);
});
}
static void init_baselib(cs::state &s, build::make &mk, bool ignore_env) {
s.new_command("echo", "C", [](auto &, auto args, auto &) {
ostd::writeln(std::string_view{args[0].get_str()});
});
s.new_command("shell", "C", [&mk](auto &, auto args, auto &) {
mk.push_task([ds = std::string(std::string_view{args[0].get_str()})]() {
if (system(ds.data())) {
throw build::make_error{""};
}
});
});
s.new_command("getenv", "ss", [ignore_env](auto &, auto args, auto &res) {
if (ignore_env) {
res.set_str("");
return;
}
res.set_str(ostd::env_get(std::string_view{args[0].get_str()}).value_or(
std::string{std::string_view{args[1].get_str()}}
));
});
s.new_command("invoke", "s", [&mk](auto &, auto args, auto &) {
mk.exec(std::string_view{args[0].get_str()});
});
}
static void init_pathlib(cs::state &s) {
s.new_command("extreplace", "sss", [](auto &css, auto args, auto &res) {
ostd::string_range oldext = std::string_view{args[1].get_str()};
ostd::string_range newext = std::string_view{args[2].get_str()};
std::string ret;
cs::list_parser p{css, args[0].get_str()};
while (p.parse()) {
ostd::path np{std::string_view{p.get_item()}};
if (!ret.empty()) {
ret += ' ';
}
ret += (
(np.suffixes() == oldext) ? np.with_suffixes(newext) : np
).string();
}
res.set_str(ret);
});
s.new_command("glob", "C", [](auto &css, auto args, auto &res) {
auto app = ostd::appender<std::vector<ostd::path>>();
cs::list_parser p{css, args[0].get_str()};
while (p.parse()) {
auto it = p.get_item();
fs::glob_match(app, std::string_view{it});
}
res.set_str(ostd::format(
ostd::appender<std::string>(), "%(%s %)", app.get()
).get());
});
}
static bool do_run_file(cs::state &s, std::string_view fname) {
ostd::file_stream f{fname};
if (!f.is_open()) {
return false;
}
f.seek(0, ostd::stream_seek::END);
auto len = f.tell();
f.seek(0);
auto buf = std::make_unique<char[]>(len + 1);
if (!buf) {
return false;
}
if (f.read_bytes(buf.get(), len) != std::size_t(len)) {
return false;
}
buf[len] = '\0';
s.run(std::string_view{buf.get(), std::size_t(len)}, fname);
return true;
}
void do_main(int argc, char **argv) {
/* cubescript interpreter */
cs::state s;
s.init_libs();
/* arg values */
std::string action = "default";
std::string deffile = "obuild.cfg";
std::string curdir;
std::string fcont;
bool ignore_env = false;
int jobs = 1;
/* input options */
{
ostd::arg_parser ap;
auto &help = ap.add_optional("-h", "--help", 0)
.help("print this message and exit")
.action(ostd::arg_print_help(ap));
ap.add_optional("-j", "--jobs", 1)
.help("specify the number of jobs to use (default: 1)")
.action(ostd::arg_store_format("%d", jobs));
ap.add_optional("-C", "--change-directory", 1)
.help("change to DIRECTORY before running")
.metavar("DIRECTORY")
.action(ostd::arg_store_str(curdir));
ap.add_optional("-f", "--file", 1)
.help("specify the file to run (default: obuild.cfg)")
.action(ostd::arg_store_str(deffile));
ap.add_optional("-e", "--execute", 1)
.help("evaluate a string instead of a file")
.metavar("STR")
.action(ostd::arg_store_str(fcont));
ap.add_optional("-E", "--ignore-env", 0)
.help("ignore environment variables")
.action(ostd::arg_store_true(ignore_env));
ap.add_positional("action", ostd::arg_value::OPTIONAL)
.help("the action to perform")
.action(ostd::arg_store_str(action));
try {
ap.parse(argc, argv);
} catch (ostd::arg_error const &e) {
ostd::cerr.writefln("%s: %s", argv[0], e.what());
ap.print_help(ostd::cerr.iter());
throw build::make_error{""};
}
if (help.used()) {
return;
}
}
int ncpus = std::thread::hardware_concurrency();
jobs = std::max(1, jobs ? jobs : ncpus);
/* core cubescript variables */
s.new_ivar("numcpus", ncpus, true);
s.new_ivar("numjobs", jobs, true);
/* switch to target directory */
try {
if (!curdir.empty()) {
fs::current_path(curdir);
}
} catch (fs::fs_error const &e) {
throw build::make_error{
"failed changing directory: %s (%s)", curdir, e.what()
};
}
/* init buildsystem, use coroutine tasks */
build::make mk{build::make_task_coroutine, jobs};
/* octabuild cubescript libs */
init_rulelib(s, mk);
init_baselib(s, mk, ignore_env);
init_pathlib(s);
/* parse rules */
if ((
!fcont.empty() && !s.run(fcont).get_bool()
) || !do_run_file(s, deffile)) {
throw build::make_error{"failed creating rules"};
}
/* make */
mk.exec(action);
}
int main(int argc, char **argv) {
try {
do_main(argc, argv);
} catch (build::make_error const &e) {
auto s = e.what();
if (s[0]) {
ostd::cerr.writefln("%s: %s", argv[0], s);
}
return 1;
}
return 0;
}