add push and list commands

src/lang.zig

@@ -3,10 +3,8 @@ const std = @import("std");
 const plugin = @import("plugin.zig");
 
 pub const ParseError = error{
-    NoCommandGiven,
-    UnknownCommand,
+    OutOfMemory,
     ArgRequired,
-    FloatParseFail,
     ParseFail,
 };
 
@@ -160,6 +158,11 @@ pub const Lang = struct {
         self.keywords.deinit();
     }
 
+    pub fn reset(self: *Lang) void {
+        self.has_error = false;
+        self.line = 0;
+    }
+
     fn fillKeywords(self: *Lang) !void {
         _ = try self.keywords.put("noop", .Noop);
         _ = try self.keywords.put("load", .Load);
@@ -261,7 +264,7 @@ pub const Lang = struct {
 
     fn expectAny(self: *Lang, count: usize, args: ArgList) !void {
         if (args.len != count) {
-            std.debug.warn("expected {} arguments, found {}\n", count, args.len);
+            self.doError("expected {} arguments, found {}", count, args.len);
             return error.ArgRequired;
         }
     }
@@ -274,7 +277,7 @@ pub const Lang = struct {
         var i: usize = 0;
 
         if (args.len != count) {
-            std.debug.warn("expected {} arguments, found {}\n", count, args.len);
+            self.doError("expected {} arguments, found {}", count, args.len);
             return error.ArgRequired;
         }
 
@@ -319,7 +322,7 @@ pub const Lang = struct {
         self.has_error = true;
     }
 
-    pub fn parse(self: *Lang, data: []const u8) !CommandList {
+    pub fn parse(self: *Lang, data: []const u8) ParseError!CommandList {
         var splitted_it = std.mem.separate(data, ";");
         try self.fillKeywords();
         var cmds = CommandList.init(self.allocator);
@@ -359,7 +362,7 @@ pub const Lang = struct {
             // construct final Command based on command
             var cmd = Command{ .command = ctype, .args = args };
             self.validateCommand(cmd) catch |err| {
-                self.doError("Unknown command '{}' (length {})", command, command.len);
+                //self.doError("error validating command '{}': {}", command, err);
                 continue;
             };
 

src/main.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const langs = @import("lang.zig");
 const runners = @import("runner.zig");
+const printer = @import("printer.zig");
 
 test "scritcher" {
     _ = @import("lang.zig");
@@ -8,8 +9,17 @@ test "scritcher" {
 }
 
 pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
+    var stdout_file = try std.io.getStdOut();
+    const stdout = &stdout_file.outStream().stream;
+
     const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path"));
 
+    var file = try std.fs.File.openWrite(scri_path);
+    defer file.close();
+
+    var out = file.outStream();
+    var stream = &out.stream;
+
     // the thing here is that 'load :0' would load the scri_path, since we
     // now have a 'repl' argument right before it. to counteract that, the
     // initial repl buffer contains 'load :1' instead.
@@ -29,19 +39,33 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
 
     // TODO start a runner and keep it hot
 
+    var lang = langs.Lang.init(allocator);
+    defer lang.deinit();
+
     while (true) {
+        lang.reset();
         try stdout.print("> ");
 
         var buffer = try std.Buffer.init(allocator, ""[0..]);
         var line = std.io.readLine(&buffer) catch |err| {
-            if (err == error.EndOfStream) return;
+            if (err == error.EndOfStream) break;
             return err;
         };
 
-        // TODO parse the line through langs.parse, then add the command to cmds
+        if (std.mem.eql(u8, line, "push")) {
+            try file.seekTo(0);
+            try printer.printList(cmds, stream);
+            continue;
+        } else if (std.mem.eql(u8, line, "list")) {
+            try printer.printList(cmds, stream);
+            continue;
+        }
 
-        // TODO save the line to scri_file? or should we have a special `push`
-        // to do so?
+        var cmds_parsed = lang.parse(line) catch |err| {
+            std.debug.warn("repl: error while parsing: {}\n", err);
+            continue;
+        };
+        try cmds.append(cmds_parsed.at(0));
     }
 }
 

src/printer.zig

@@ -0,0 +1,23 @@
+const langs = @import("lang.zig");
+
+pub fn printList(list: langs.CommandList, stream: var) !void {
+    for (list.toSlice()) |cmd| {
+        var command = switch (cmd.command) {
+            .Noop => "noop",
+            .Load => "load",
+            .Quicksave => "quicksave",
+            .RunQS => "runqs",
+
+            // TODO rest of commands
+            else => unreachable,
+        };
+
+        try stream.print("{}", command);
+
+        for (cmd.args.toSlice()) |arg| {
+            try stream.print(" {}", arg);
+        }
+
+        try stream.write(";\n");
+    }
+}