cosmos0072

hace 2 mesesdiscuss

Found: it's a sentence from 2020, and PG decided not to appeal (!?)

Full story (in Italian) at https://www.wired.it/internet/web/2020/06/30/progetto-gutenb...

cosmos0072

hace 2 mesesdiscuss

From Italy, https://www.gutenberg.org/ gives a 404 error and https://gutenberg.org/ opens a very official-looking page stating "police notice. This site is under judicial seizure" and references a sentence number: "criminal proceedings 52127/20 R.N.R.I. tribunal of Rome"

Any idea what's happening? I thought PG published public domain books...

cosmos0072

hace 4 mesesdiscuss

> I am not familiar with the Scheme ecosystem but see you are implementing a lot within your shell (http client, sqlite support) what is great.

Yes. Initially, I wanted to integrate http client, sqlite client etc. directly in the main shell executable.

This turned out to be impractical, because it introduces compile-time dependencies on external libraries, and because any bug, vulnerability or crash in the C code would bring down the whole shell.

My current solution is to have separate C programs (currently `http` and `parse_sqlite`) that are not compiled by default: you need to run `make utils` to build them.

> But does that mean I can produce a Schemesh binary that will include Chez Scheme and run my script on any Linux or FreeBSD host?

Yes, exactly. Schemesh is a C program that includes both Chez Scheme REPL and shell features.

cosmos0072

hace 4 mesesdiscuss

Yes, they are similar at first glance. As I wrote:

> If you know nushell, they will feel familiar as they are inspired by it - the implementation is fully independent, though.

Looking deeper, there are two main differences:

- Nushell structured pipelines are an internal construct, and only work with nushell builtins. Schemesh uses actual POSIX pipes, which allows to also insert executables in the pipelines.

- schemesh also allows to insert arbitrary Scheme code in the pipelines. Nushell does too, in a sense: you have to write nushell language though

cosmos0072

hace 4 mesesdiscuss

First stable release appeared on HN one year ago: https://news.ycombinator.com/item?id=43061183 Thanks for all the feedback!

Today, version 1.0.0 adds structured pipelines: a mechanism to exchange (almost) arbitrary objects via POSIX pipes, and transform them via external programs, shell builtins or Scheme code.

Example:

  dir /proc | where name -starts k | sort-by modified

possible output:

  ┌───────────┬────┬───────────────┬────────┐
  │   name    │type│     size      │modified│
  ├───────────┼────┼───────────────┼────────┤
  │kcore      │file│140737471590400│09:32:44│
  │kmsg       │file│              0│09:32:49│
  │kallsyms   │file│              0│09:32:50│
  │kpageflags │file│              0│10:42:53│
  │keys       │file│              0│10:42:53│
  │kpagecount │file│              0│10:42:53│
  │key-users  │file│              0│10:42:53│
  │kpagecgroup│file│              0│10:42:53│
  └───────────┴────┴───────────────┴────────┘

Another example:

  ip -j route | select dst dev prefsrc | to json1

possible output:

  [{"dst":"default","dev":"eth0"},
  {"dst":"192.168.0.0/24","dev":"eth0","prefsrc":"192.168.0.2"}]

Internally, objects are serialized before writing them to a pipe - by default as NDJSON, but it can be set manually - and deserialized when reading them from a pipe.

This allows arbitrary transformations at each pipeline step: filtering, choosing a subset of the fields, sorting with user-specified criteria, etc. And each step can be an executable program, a shell builtin or Scheme code.

If you know nushell, they will feel familiar as they are inspired by it - the implementation is fully independent, though.

cosmos0072

hace 4 mesesdiscuss

Parents already have a lot of control on children' education.

Examples: most children believe in the same religion as their parents, and can visit friends and places only if/when allowed by their parents.

This is simply extending the same level of control to the internet.

Government-mandated restrictions are completely another level.

cosmos0072

hace 4 mesesdiscuss

I am from EU, and contrary to age verification laws in general.

My stance is that if somebody is a minor, his/her/their parents/tutors/legal guardian are responsible for what they can/cannot do online, and that the mechanism to enforce that is parental control on devices.

Having said that, open-source zero-knowledge proofs are infinitely less evil (I refuse to say "better") than commercial cloud-based age monitoring baked into every OS

cosmos0072

hace 9 mesesdiscuss

I need this *so* often that I programmed my shell to execute 'cd ..' every time I press KP/ i.e. '/' on the keypad, without having to hit Return.

Other single-key bindings I use often are:

KP* executes 'ls'

KP- executes 'cd -'

KP+ executes 'make -j `nproc`'

cosmos0072

hace 9 mesesdiscuss

The math looks suspicious to me, or at least how it is presented.

If, as stated, accessing one register requires ~0.3 ns and available registers sum up to ~2560 B, while accessing RAM requires ~80 ns and available RAM is ~32 GiB, then it means that memory access time is O(N^1/3) where N is the memory size.

Thus accessing the whole N bytes of memory of a certain kind (registers, or L1/L2/L3 cache, or RAM) takes N * O(N^1/3) = O(N^4/3).

One could argue that the title "Memory access is O(N^1/3)" refers to memory access time, but that contradicts the very article's body, which explains in detail "in 2x time you can access 8x as much memory" both in text and with a diagram.

Such statement would require that accessing the whole N bytes of memory of a certain kind requires O(N^1/3) time, while the measurements themselves produce a very different estimate: accessing the whole N bytes of memory of a certain kind requires O(N^4/3) time, not O(N^1/3)

cosmos0072

hace 10 mesesdiscuss

For me it's more about "feeling" badly written code, as if it stinks and is unpleasant to look at, and conversely enjoying nicely written one, and seeing its elegance and beauty.

Especially when I have to familiarize with code written by someone else, I usually start by "cleaning" it - small refactorings such as splitting overlong functions and simplifying expressions, that are trivial to prove as correct even without a deep knowledge of the code purpose.

Only when the code looks sufficiently clean and familiar, I start adding the requested new features

cosmos0072

Submissions

Schemesh – Unix shell and Lisp REPL, now with structured pipelines

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