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repl: handle when original file doesn't exist

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Luna 2019-10-20 11:37:11 -03:00
parent c05be26dbd
commit a18809eb5b
1 changed files with 9 additions and 4 deletions
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13
src/main.zig
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@ -27,8 +27,11 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
const stdout = &stdout_file.outStream().stream; const stdout = &stdout_file.outStream().stream;
const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path")); const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path"));
var file_read = try std.fs.File.openRead(scri_path); var file_read_opt: ?std.fs.File = std.fs.File.openRead(scri_path) catch |err| blk: {
const total_bytes = try file_read.getEndPos(); 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); var cmds = langs.CommandList.init(allocator);
defer cmds.deinit(); defer cmds.deinit();
@ -41,7 +44,7 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
// existing_cmds, and then passed along to cmds), // existing_cmds, and then passed along to cmds),
// we can't defer them here // we can't defer them here
var scri_existing = try allocator.alloc(u8, total_bytes); var scri_existing = try allocator.alloc(u8, total_bytes);
_ = try file_read.read(scri_existing); _ = try file_read_opt.?.read(scri_existing);
// we can defer this because we copy the Command structs back to cmds // we can defer this because we copy the Command structs back to cmds
var existing_cmds = try lang.parse(scri_existing); var existing_cmds = try lang.parse(scri_existing);
@ -64,7 +67,9 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
}); });
} }
file_read.close(); if (file_read_opt) |file_read| {
file_read.close();
}
var file = try std.fs.File.openWrite(scri_path); var file = try std.fs.File.openWrite(scri_path);
defer file.close(); defer file.close();