scritcher/src/main.zig

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const std = @import("std");
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const langs = @import("lang.zig");
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const runners = @import("runner.zig");
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const printer = @import("printer.zig");
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test "scritcher" {
_ = @import("lang.zig");
_ = @import("runner.zig");
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}
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const readline = @cImport({
@cInclude("stdio.h");
@cInclude("stdlib.h");
@cInclude("readline/readline.h");
@cInclude("readline/history.h");
});
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fn wrapInCmdList(allocator: *std.mem.Allocator, cmd: *langs.Command) !langs.CommandList {
var cmds = langs.CommandList.init(allocator);
try cmds.append(cmd);
return cmds;
}
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fn copyCommandToHeap(allocator: *std.mem.Allocator, command: langs.Command, comptime tag: langs.Command.Tag) !*langs.Command {
const CommandStruct = langs.Command.tagToType(tag);
const casted = command.cast(CommandStruct).?;
var heap_cmd = try allocator.create(CommandStruct);
@memcpy(
@ptrCast([*]u8, &heap_cmd),
@ptrCast([*]const u8, &casted),
@sizeOf(CommandStruct),
);
return &heap_cmd.base;
}
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pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
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var stdout_file = std.io.getStdOut();
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const stdout = &stdout_file.outStream();
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const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path"));
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var file_read_opt: ?std.fs.File = std.fs.cwd().openFile(scri_path, .{}) catch |err| blk: {
if (err == error.FileNotFound) break :blk null;
return err;
};
const total_bytes = if (file_read_opt) |file_read| try file_read.getEndPos() else 0;
var cmds = langs.CommandList.init(allocator);
defer cmds.deinit();
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var lang = langs.Lang.init(allocator);
defer lang.deinit();
if (total_bytes > 0) {
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// this MUST BE long lived (a reference to it is kept inside
// existing_cmds, and then passed along to cmds),
// we can't defer them here
var scri_existing = try allocator.alloc(u8, total_bytes);
_ = try file_read_opt.?.read(scri_existing);
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// we can defer this because we copy the Command structs back to cmds
var existing_cmds = try lang.parse(scri_existing);
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defer existing_cmds.deinit();
// copy the existing command list into the repl's command list
for (existing_cmds.items) |existing_cmd| {
try cmds.append(existing_cmd);
}
} else {
// if there isn't any commands on the file, we load our default
// 'load :0' command
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// TODO: deliberate memleak here. we only allocate this
// command once, for the start of the file, so.
var load_cmd = try allocator.create(langs.Command.Load);
std.mem.copy(u8, load_cmd.path, ":0");
load_cmd.base.tag = langs.Command.Tag.load;
// taking address is fine, because load_cmd lives in the lifetime
// of the allocator.
try cmds.append(&load_cmd.base);
}
if (file_read_opt) |file_read| {
file_read.close();
}
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var file = try std.fs.cwd().openFile(scri_path, .{
.write = true,
.read = false,
});
defer file.close();
var out = file.outStream();
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var stream = &out;
// since we opened the file for writing, it becomes empty, so, to ensure
// we don't fuck up later on, we print cmds before starting the repl
try printer.printList(cmds, stdout);
try printer.printList(cmds, stream);
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// we keep
// - a CommandList with the full commands we have right now
// - a Command with the current last typed successful command
// - one runner that contains the current full state of the image
// as if the current cmds was ran over it (TODO better wording)
// - one runner that gets copied from the original on every new
// command the user issues
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var current: langs.Command = undefined;
var runner = runners.Runner.init(allocator, true);
defer runner.deinit();
// run the load command
try runner.runCommands(cmds, true);
const wanted_runner: []const u8 = std.os.getenv("SCRITCHER_RUNNER") orelse "ristretto";
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var runqs_cmd = langs.Command.RunQS{
.base = langs.Command{ .tag = langs.Command.Tag.runqs },
.program = wanted_runner,
};
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while (true) {
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lang.reset();
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var rd_line = readline.readline("> ");
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if (rd_line == null) {
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std.debug.warn("leaving from eof\n", .{});
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break;
}
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readline.add_history(rd_line);
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//defer std.heap.c_allocator.destroy(rd_line);
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var line = rd_line[0..std.mem.len(rd_line)];
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if (std.mem.eql(u8, line, "push")) {
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const heap_cmd = switch (current.tag) {
.noop => try copyCommandToHeap(allocator, current, .noop),
.load => try copyCommandToHeap(allocator, current, .load),
.quicksave => try copyCommandToHeap(allocator, current, .quicksave),
.runqs => try copyCommandToHeap(allocator, current, .runqs),
.amp => try copyCommandToHeap(allocator, current, .amp),
.rflanger => try copyCommandToHeap(allocator, current, .rflanger),
.eq => try copyCommandToHeap(allocator, current, .eq),
.phaser => try copyCommandToHeap(allocator, current, .phaser),
.mbeq => try copyCommandToHeap(allocator, current, .mbeq),
.chorus => try copyCommandToHeap(allocator, current, .chorus),
.pitchscaler => try copyCommandToHeap(allocator, current, .pitchscaler),
.reverb => try copyCommandToHeap(allocator, current, .reverb),
.highpass => try copyCommandToHeap(allocator, current, .highpass),
.delay => try copyCommandToHeap(allocator, current, .delay),
.vinyl => try copyCommandToHeap(allocator, current, .vinyl),
.revdelay => try copyCommandToHeap(allocator, current, .revdelay),
.gate => try copyCommandToHeap(allocator, current, .gate),
.detune => try copyCommandToHeap(allocator, current, .detune),
.overdrive => try copyCommandToHeap(allocator, current, .overdrive),
.degrade => try copyCommandToHeap(allocator, current, .degrade),
.repsycho => try copyCommandToHeap(allocator, current, .repsycho),
.talkbox => try copyCommandToHeap(allocator, current, .talkbox),
.dyncomp => try copyCommandToHeap(allocator, current, .dyncomp),
.thruzero => try copyCommandToHeap(allocator, current, .thruzero),
.foverdrive => try copyCommandToHeap(allocator, current, .foverdrive),
.gverb => try copyCommandToHeap(allocator, current, .gverb),
.invert => try copyCommandToHeap(allocator, current, .invert),
.tapedelay => try copyCommandToHeap(allocator, current, .tapedelay),
.moddelay => try copyCommandToHeap(allocator, current, .moddelay),
.multichorus => try copyCommandToHeap(allocator, current, .multichorus),
.saturator => try copyCommandToHeap(allocator, current, .saturator),
.vintagedelay => try copyCommandToHeap(allocator, current, .vintagedelay),
.noise => try copyCommandToHeap(allocator, current, .noise),
.wildnoise => try copyCommandToHeap(allocator, current, .wildnoise),
.write => try copyCommandToHeap(allocator, current, .write),
.embed => try copyCommandToHeap(allocator, current, .embed),
.rotate => try copyCommandToHeap(allocator, current, .rotate),
};
try cmds.append(heap_cmd);
// run the current added command to main cmds list
// with the main parent runner
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var cmds_wrapped = try wrapInCmdList(allocator, heap_cmd);
defer cmds_wrapped.deinit();
try runner.runCommands(cmds_wrapped, true);
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continue;
} else if (std.mem.eql(u8, line, "list")) {
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try printer.printList(cmds, stdout);
continue;
} else if (std.mem.eql(u8, line, "save")) {
// seek to 0 instead of appending the new command
// NOTE appending single command might be faster
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try file.seekTo(0);
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try printer.printList(cmds, stream);
continue;
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} else if (std.mem.eql(u8, line, "quit") or std.mem.eql(u8, line, "q")) {
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std.debug.warn("leaving\n", .{});
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break;
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} else if (std.mem.startsWith(u8, line, "#")) {
continue;
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}
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var cmds_parsed = lang.parse(line) catch |err| {
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std.debug.warn("repl: error while parsing: {}\n", .{err});
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continue;
};
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// no command? ignore!
if (cmds_parsed.items.len == 0) continue;
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current = cmds_parsed.items[0].*;
// by cloning the parent runner, we can iteratively write
// whatever command we want and only commit the good results
// back to the parent runner
var runner_clone = try runner.clone();
defer runner_clone.deinit();
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// taking address is fine, because runqs_cmd lives in the lifetime
// of this function.
try cmds.append(&runqs_cmd.base);
try runner_clone.runCommands(cmds, true);
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_ = try stdout.write("\n");
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}
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}
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pub fn main() !void {
const allocator = std.heap.page_allocator;
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var lang = langs.Lang.init(allocator);
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defer lang.deinit();
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var runner = runners.Runner.init(allocator, false);
defer runner.deinit();
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var args_it = std.process.args();
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// TODO print help
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_ = try (args_it.next(allocator) orelse @panic("expected exe name"));
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const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path or 'repl'"));
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if (std.mem.eql(u8, scri_path, "repl")) {
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return try doRepl(allocator, &args_it);
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}
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var file = try std.fs.cwd().openFile(scri_path, .{});
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defer file.close();
// sadly, we read it all into memory. such is life
const total_bytes = try file.getEndPos();
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var data = try allocator.alloc(u8, total_bytes);
defer allocator.free(data);
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_ = try file.read(data);
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var cmds = try lang.parse(data);
defer cmds.deinit();
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try runner.runCommands(cmds, true);
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}