From 4acaf0308cbd0586dae4602beaf835c41789ec5d Mon Sep 17 00:00:00 2001 From: javalsai Date: Fri, 18 Oct 2024 18:43:18 +0200 Subject: [PATCH 1/6] chore: define rust channel (+ fmt) --- rust-toolchain.toml | 2 ++ src/main.rs | 5 +---- 2 files changed, 3 insertions(+), 4 deletions(-) create mode 100644 rust-toolchain.toml diff --git a/rust-toolchain.toml b/rust-toolchain.toml new file mode 100644 index 0000000..5d56faf --- /dev/null +++ b/rust-toolchain.toml @@ -0,0 +1,2 @@ +[toolchain] +channel = "nightly" diff --git a/src/main.rs b/src/main.rs index b971a37..323ca1d 100644 --- a/src/main.rs +++ b/src/main.rs @@ -21,7 +21,6 @@ async fn main() -> ExitCode { let mut page = 0; loop { - println!("now scraping page {}", page + 1); let post_html = async || { @@ -45,11 +44,10 @@ async fn main() -> ExitCode { let mut wait_time = 5000; if urls.is_empty() { - for reconnection_attempts in 0..4 { println!("no urls found, retrying in {} seconds...", wait_time / 1000); sleep(Duration::from_millis(wait_time)).await; - + urls = post_html().await; if !urls.is_empty() { @@ -67,7 +65,6 @@ async fn main() -> ExitCode { } for url in urls { - let img_url = extract_img_url(&client.get(url).send().await.unwrap().text().await.unwrap()); if img_url.is_empty() { From e62d2cc186c3460f3c6555bfff57cf2647142ba9 Mon Sep 17 00:00:00 2001 From: javalsai Date: Fri, 18 Oct 2024 18:50:40 +0200 Subject: [PATCH 2/6] feat: add arg parsing --- Cargo.lock | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + src/main.rs | 16 ++++++- 3 files changed, 135 insertions(+), 2 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index ac51be2..e62339a 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -26,6 +26,55 @@ dependencies = [ "memchr", ] +[[package]] +name = "anstream" +version = "0.6.15" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "64e15c1ab1f89faffbf04a634d5e1962e9074f2741eef6d97f3c4e322426d526" +dependencies = [ + "anstyle", + "anstyle-parse", + "anstyle-query", + "anstyle-wincon", + "colorchoice", + "is_terminal_polyfill", + "utf8parse", +] + +[[package]] +name = "anstyle" +version = "1.0.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1" + +[[package]] +name = "anstyle-parse" +version = "0.2.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "eb47de1e80c2b463c735db5b217a0ddc39d612e7ac9e2e96a5aed1f57616c1cb" +dependencies = [ + "utf8parse", +] + +[[package]] +name = "anstyle-query" +version = "1.1.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "6d36fc52c7f6c869915e99412912f22093507da8d9e942ceaf66fe4b7c14422a" +dependencies = [ + "windows-sys 0.52.0", +] + +[[package]] +name = "anstyle-wincon" +version = "3.0.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "5bf74e1b6e971609db8ca7a9ce79fd5768ab6ae46441c572e46cf596f59e57f8" +dependencies = [ + "anstyle", + "windows-sys 0.52.0", +] + [[package]] name = "atomic-waker" version = "1.1.2" @@ -92,6 +141,52 @@ version = "1.0.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd" +[[package]] +name = "clap" +version = "4.5.20" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b97f376d85a664d5837dbae44bf546e6477a679ff6610010f17276f686d867e8" +dependencies = [ + "clap_builder", + "clap_derive", +] + +[[package]] +name = "clap_builder" +version = "4.5.20" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "19bc80abd44e4bed93ca373a0704ccbd1b710dc5749406201bb018272808dc54" +dependencies = [ + "anstream", + "anstyle", + "clap_lex", + "strsim", +] + +[[package]] +name = "clap_derive" +version = "4.5.18" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4ac6a0c7b1a9e9a5186361f67dfa1b88213572f427fb9ab038efb2bd8c582dab" +dependencies = [ + "heck", + "proc-macro2", + "quote", + "syn", +] + +[[package]] +name = "clap_lex" +version = "0.7.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1462739cb27611015575c0c11df5df7601141071f07518d56fcc1be504cbec97" + +[[package]] +name = "colorchoice" +version = "1.0.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d3fd119d74b830634cea2a0f58bbd0d54540518a14397557951e79340abc28c0" + [[package]] name = "core-foundation" version = "0.9.4" @@ -261,6 +356,12 @@ version = "0.15.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "1e087f84d4f86bf4b218b927129862374b72199ae7d8657835f1e89000eea4fb" +[[package]] +name = "heck" +version = "0.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea" + [[package]] name = "hermit-abi" version = "0.3.9" @@ -405,6 +506,12 @@ version = "2.10.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "ddc24109865250148c2e0f3d25d4f0f479571723792d3802153c60922a4fb708" +[[package]] +name = "is_terminal_polyfill" +version = "1.70.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf" + [[package]] name = "itoa" version = "1.0.11" @@ -626,6 +733,7 @@ dependencies = [ name = "r34-scraper" version = "0.1.0" dependencies = [ + "clap", "regex", "reqwest", "tokio", @@ -920,6 +1028,12 @@ version = "0.9.8" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67" +[[package]] +name = "strsim" +version = "0.11.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f" + [[package]] name = "subtle" version = "2.6.1" @@ -1127,6 +1241,12 @@ dependencies = [ "percent-encoding", ] +[[package]] +name = "utf8parse" +version = "0.2.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821" + [[package]] name = "vcpkg" version = "0.2.15" diff --git a/Cargo.toml b/Cargo.toml index bea413b..13de98d 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -4,6 +4,7 @@ version = "0.1.0" edition = "2021" [dependencies] +clap = { version = "4.5.20", features = ["derive"] } regex = "1.11.0" reqwest = { version = "0.12.8", features = ["blocking"] } tokio = { version = "1", features = ["full"] } diff --git a/src/main.rs b/src/main.rs index 323ca1d..769b9ee 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,13 +1,25 @@ #![feature(async_closure)] +use clap::Parser; use regex::Regex; use reqwest::Client; use std::process::ExitCode; use tokio::time::{sleep, Duration}; -const USER_AGENT: &str = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"; +#[derive(Parser)] +#[command(version)] +struct Args { + /// User Agent to use for requests + #[arg( + short, + default_value = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36" + )] + user_agent: String, +} #[tokio::main] async fn main() -> ExitCode { + let args = Args::parse(); + println!("which tags do you want to scrape? ex: 1girls+1boys+yomama"); let tags = std::io::stdin() .lines() @@ -17,7 +29,7 @@ async fn main() -> ExitCode { .trim() .to_string(); - let client = Client::builder().user_agent(USER_AGENT).build().unwrap(); + let client = Client::builder().user_agent(args.user_agent).build().unwrap(); let mut page = 0; loop { From 5ce292d1c262057cc9ebc43d7126b16ab660e64b Mon Sep 17 00:00:00 2001 From: javalsai Date: Fri, 18 Oct 2024 19:26:11 +0200 Subject: [PATCH 3/6] chore: modularity & good code --- src/args/mod.rs | 16 +++++++++++++++ src/main.rs | 53 ++++++++++++++++++++++++------------------------- 2 files changed, 42 insertions(+), 27 deletions(-) create mode 100644 src/args/mod.rs diff --git a/src/args/mod.rs b/src/args/mod.rs new file mode 100644 index 0000000..f982d82 --- /dev/null +++ b/src/args/mod.rs @@ -0,0 +1,16 @@ +use clap::Parser; + +#[derive(Parser)] +#[command(version)] +pub struct Args { + /// User Agent to use for requests + #[arg( + short, + default_value = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36" + )] + pub user_agent: String, + + // Tags to search for + #[arg(short, long)] + pub tags: Option>, +} diff --git a/src/main.rs b/src/main.rs index 769b9ee..037909e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,45 +1,44 @@ -#![feature(async_closure)] +#![feature(async_closure, iter_intersperse)] +pub mod args; + use clap::Parser; use regex::Regex; use reqwest::Client; use std::process::ExitCode; use tokio::time::{sleep, Duration}; -#[derive(Parser)] -#[command(version)] -struct Args { - /// User Agent to use for requests - #[arg( - short, - default_value = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36" - )] - user_agent: String, -} - #[tokio::main] async fn main() -> ExitCode { - let args = Args::parse(); + let args = args::Args::parse(); - println!("which tags do you want to scrape? ex: 1girls+1boys+yomama"); - let tags = std::io::stdin() - .lines() - .next() - .unwrap() - .unwrap() - .trim() - .to_string(); + let tags = args.tags.unwrap_or_else(|| { + println!("which tags do you want to scrape? ex: 1girls 1boys yomama"); + let tags_binding = std::io::stdin().lines().next().unwrap().unwrap(); + tags_binding + .split(' ') + .filter(|item| !item.is_empty()) + .map(|item| item.to_owned()) + .collect() + }); + let uri_tags: String = tags.into_iter().intersperse(String::from("+")).collect(); - let client = Client::builder().user_agent(args.user_agent).build().unwrap(); - let mut page = 0; + let client = Client::builder() + .user_agent(args.user_agent) + .build() + .unwrap(); - loop { + for page in 0.. { println!("now scraping page {}", page + 1); + println!( + "https://rule34.xxx/index.php?page=post&s=list&tags={uri_tags}&pid={}", + page * 42 + ); let post_html = async || { extract_urls( &client .get(format!( - "https://rule34.xxx/index.php?page=post&s=list&tags={tags}&pid={}", + "https://rule34.xxx/index.php?page=post&s=list&tags={uri_tags}&pid={}", page * 42 )) .send() @@ -85,9 +84,9 @@ async fn main() -> ExitCode { println!("found image url: {img_url}"); } } - - page += 1; } + + return ExitCode::SUCCESS; } fn extract_urls(html: &str) -> Vec { From ace4ac28110e6cd481330a7716b504350630310d Mon Sep 17 00:00:00 2001 From: javalsai Date: Sat, 19 Oct 2024 21:13:02 +0200 Subject: [PATCH 4/6] fix: conflicts & feat: multiline logger --- Cargo.lock | 66 +++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + src/args/mod.rs | 2 +- src/main.rs | 66 +++++++++++++++++++++++++++---------------------- 4 files changed, 104 insertions(+), 31 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 6d130ef..aaa5301 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -322,6 +322,19 @@ dependencies = [ "crossbeam-utils", ] +[[package]] +name = "console" +version = "0.15.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "0e1f83fc076bd6dd27517eacdf25fef6c4dfe5f1d7448bafaaf3a26f13b5e4eb" +dependencies = [ + "encode_unicode", + "lazy_static", + "libc", + "unicode-width", + "windows-sys 0.52.0", +] + [[package]] name = "core-foundation" version = "0.9.4" @@ -344,6 +357,12 @@ version = "0.8.20" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80" +[[package]] +name = "encode_unicode" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f" + [[package]] name = "encoding_rs" version = "0.8.34" @@ -738,6 +757,28 @@ dependencies = [ "hashbrown", ] +[[package]] +name = "indicatif" +version = "0.17.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "763a5a8f45087d6bcea4222e7b72c291a054edf80e4ef6efd2a4979878c7bea3" +dependencies = [ + "console", + "instant", + "number_prefix", + "portable-atomic", + "unicode-width", +] + +[[package]] +name = "instant" +version = "0.1.13" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e0242819d153cba4b4b05a5a8f2a7e9bbf97b6055b2a002b395c96b5ff3c0222" +dependencies = [ + "cfg-if", +] + [[package]] name = "ipnet" version = "2.10.1" @@ -774,6 +815,12 @@ dependencies = [ "log", ] +[[package]] +name = "lazy_static" +version = "1.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe" + [[package]] name = "libc" version = "0.2.161" @@ -855,6 +902,12 @@ dependencies = [ "tempfile", ] +[[package]] +name = "number_prefix" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3" + [[package]] name = "object" version = "0.36.5" @@ -993,6 +1046,12 @@ dependencies = [ "windows-sys 0.59.0", ] +[[package]] +name = "portable-atomic" +version = "1.9.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cc9c68a3f6da06753e9335d63e27f6b9754dd1920d941135b7ea8224f141adb2" + [[package]] name = "proc-macro2" version = "1.0.88" @@ -1018,6 +1077,7 @@ dependencies = [ "async-std", "clap", "futures", + "indicatif", "regex", "reqwest", "tokio", @@ -1508,6 +1568,12 @@ dependencies = [ "tinyvec", ] +[[package]] +name = "unicode-width" +version = "0.1.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af" + [[package]] name = "untrusted" version = "0.9.0" diff --git a/Cargo.toml b/Cargo.toml index 80fd8a3..7fb2766 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -7,6 +7,7 @@ edition = "2021" async-std = "1.13.0" clap = { version = "4.5.20", features = ["derive"] } futures = "0.3.31" +indicatif = "0.17.8" regex = "1.11.0" reqwest = { version = "0.12.8", features = ["blocking"] } tokio = { version = "1", features = ["full"] } diff --git a/src/args/mod.rs b/src/args/mod.rs index 22c3479..5e78d06 100644 --- a/src/args/mod.rs +++ b/src/args/mod.rs @@ -16,5 +16,5 @@ pub struct Args { /// Async jobs to use for fetching #[arg(short, long, default_value = "4")] - pub jobs: usize + pub jobs: usize, } diff --git a/src/main.rs b/src/main.rs index 9ea9b16..b14ae51 100644 --- a/src/main.rs +++ b/src/main.rs @@ -6,9 +6,8 @@ use futures::{stream, StreamExt}; use regex::Regex; use reqwest::Client; use tokio::time::{sleep, Duration}; -use async_std::sync::Mutex; -use std::{process::ExitCode, sync::Arc}; +use std::process::ExitCode; #[tokio::main] async fn main() -> ExitCode { @@ -78,37 +77,44 @@ async fn main() -> ExitCode { } } - let ratelimit_lock = &Arc::new(Mutex::new(())); - let responses = stream::iter(urls.into_iter().enumerate()).map(|(i, url)| { - let client = &client; - async move { - // "thread" - let thread_id = format!("[{: >4}]", i % 9999); - println!("{thread_id} scraping {url:?}"); - loop { - let lock = ratelimit_lock.lock().await; - drop(lock); - let resp = client.get(&url).send().await.unwrap(); - match extract_img_url(&resp.text().await.unwrap()) { - Ok(img_url) => { - if img_url.is_empty() { - println!("{thread_id} image url not found"); - } else { - println!("{thread_id} found image url: {img_url}"); + let multi_prog = indicatif::MultiProgress::new(); + let urls_ammount = urls.len(); + let responses = stream::iter(urls.into_iter().enumerate()) + .map(|(i, url)| { + let i = i + 1; + let client = &client; + let this_bar = indicatif::ProgressBar::new_spinner(); + this_bar.enable_steady_tick(Duration::from_millis(50)); + let this_prog = multi_prog.insert(i, this_bar); + async move { + // "thread" + loop { + this_prog.set_message(format!("\x1b[30m[{i}/{urls_ammount}] \x1b[36mscraping {url:?}\x1b[0m")); + let resp = client.get(&url).send().await.unwrap(); + match extract_img_url(&resp.text().await.unwrap()) { + Ok(img_url) => { + if img_url.is_empty() { + this_prog.abandon_with_message(format!( + "\x1b[30m[{i}/{urls_ammount}] \x1b[1;31mimage url not found\x1b[0m" + )); + } else { + this_prog.finish_with_message(format!( + "\x1b[30m[{i}/{urls_ammount}] \x1b[32mfound image url: {img_url}\x1b[0m" + )); + } + break img_url; + } + Err(_) => { + this_prog + .set_message(format!("\x1b[30m[{i}/{urls_ammount}] \x1b[31mratelimited, retrying after 1 second\x1b[0m")); + tokio::time::sleep(std::time::Duration::from_millis(1000)).await; + continue; } - break img_url; - } - Err(_) => { - let lock = ratelimit_lock.lock().await; - println!("{thread_id} ratelimited, retrying after 1 second"); - tokio::time::sleep(std::time::Duration::from_millis(1000)).await; - drop(lock); - continue; } } - }; - } - }).buffered(args.jobs); + } + }) + .buffered(args.jobs); let _ = responses.for_each(|_| async {}).await; } From 022352b554a90e1da407753ea44725b4ee0e43a2 Mon Sep 17 00:00:00 2001 From: javalsai Date: Sat, 19 Oct 2024 21:37:31 +0200 Subject: [PATCH 5/6] feat: misc improvements --- src/args/mod.rs | 11 ++++++++++- src/main.rs | 13 ++++++++----- 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/src/args/mod.rs b/src/args/mod.rs index 5e78d06..1056a42 100644 --- a/src/args/mod.rs +++ b/src/args/mod.rs @@ -1,6 +1,6 @@ use clap::Parser; -#[derive(Parser)] +#[derive(Debug, Parser)] #[command(version)] pub struct Args { /// User Agent to use for requests @@ -17,4 +17,13 @@ pub struct Args { /// Async jobs to use for fetching #[arg(short, long, default_value = "4")] pub jobs: usize, + + /// Delay for rate-limits (ms) + #[arg(short, long, default_value = "1000", value_parser = parse_duration)] + pub delay: std::time::Duration, +} + +fn parse_duration(arg: &str) -> Result { + let seconds = arg.parse()?; + Ok(std::time::Duration::from_millis(seconds)) } diff --git a/src/main.rs b/src/main.rs index b14ae51..5449b39 100644 --- a/src/main.rs +++ b/src/main.rs @@ -89,25 +89,28 @@ async fn main() -> ExitCode { async move { // "thread" loop { - this_prog.set_message(format!("\x1b[30m[{i}/{urls_ammount}] \x1b[36mscraping {url:?}\x1b[0m")); + this_prog.set_message(format!("\x1b[30m[{i: >4}/{urls_ammount}] \x1b[36mscraping {url:?}\x1b[0m")); let resp = client.get(&url).send().await.unwrap(); match extract_img_url(&resp.text().await.unwrap()) { Ok(img_url) => { if img_url.is_empty() { this_prog.abandon_with_message(format!( - "\x1b[30m[{i}/{urls_ammount}] \x1b[1;31mimage url not found\x1b[0m" + "\x1b[30m[{i: >4}/{urls_ammount}] \x1b[1;31mimage url not found\x1b[0m" )); } else { this_prog.finish_with_message(format!( - "\x1b[30m[{i}/{urls_ammount}] \x1b[32mfound image url: {img_url}\x1b[0m" + "\x1b[30m[{i: >4}/{urls_ammount}] \x1b[32mfound image url: {img_url}\x1b[0m" )); } break img_url; } Err(_) => { this_prog - .set_message(format!("\x1b[30m[{i}/{urls_ammount}] \x1b[31mratelimited, retrying after 1 second\x1b[0m")); - tokio::time::sleep(std::time::Duration::from_millis(1000)).await; + .set_message(format!( + "\x1b[30m[{i: >4}/{urls_ammount}] \x1b[31mratelimited, retrying after {}ms\x1b[0m", + args.delay.as_millis()) + ); + tokio::time::sleep(args.delay).await; continue; } } From 9c55ef19b8f8c4173aeb9b2addcb75fa20bbee7f Mon Sep 17 00:00:00 2001 From: javalsai Date: Sat, 19 Oct 2024 21:39:02 +0200 Subject: [PATCH 6/6] add: license --- LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 674 insertions(+) create mode 100644 LICENSE diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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