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Dec 12, 2017
Merged

Issue287: create random password from a set of allowed characters #372

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50 changes: 50 additions & 0 deletions src/basics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
| [Generate random numbers within a range][ex-rand-range] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Generate random numbers with given distribution][ex-rand-dist] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Generate random values of a custom type][ex-rand-custom] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Create random passwords from a set of alphanumeric characters][ex-rand-passwd] | [![rand-badge]][rand] | [![cat-os-badge]][cat-os] |
| [Create random passwords from a set of user-defined characters][ex-rand-choose] | [![rand-badge]][rand] | [![cat-os-badge]][cat-os] |
| [Run an external command and process stdout][ex-parse-subprocess-output] | [![regex-badge]][regex] | [![cat-os-badge]][cat-os] [![cat-text-processing-badge]][cat-text-processing] |
| [Run an external command passing it stdin and check for an error code][ex-parse-subprocess-input] | [![regex-badge]][regex] | [![cat-os-badge]][cat-os] [![cat-text-processing-badge]][cat-text-processing] |
| [Run piped external commands][ex-run-piped-external-commands] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |
Expand Down Expand Up @@ -277,6 +279,52 @@ fn main() {
}
```

[ex-rand-passwd]: #ex-rand-passwd
<a name="ex-rand-passwd"></a>
## Create random passwords from a set of alphanumeric characters

[![rand-badge]][rand] [![cat-os-badge]][cat-os]

Randomly generates a string of given length ASCII characters in the range `A-Z, a-z, 0-9`, with [`gen_ascii_chars`].

```rust
extern crate rand;

use rand::{thread_rng, Rng};

fn main() {
let rand_string: String = thread_rng().gen_ascii_chars().take(30).collect();
println!("{}", rand_string);
}
```

[ex-rand-choose]: #ex-rand-choose
<a name="ex-rand-choose"></a>
## Create random passwords from a set of user-defined characters

[![rand-badge]][rand] [![cat-os-badge]][cat-os]

Randomly generates a string of given length ASCII characters with custom user-defined bytestring, with [`choose`].

```rust
extern crate rand;

use rand::{thread_rng, Rng};

fn main() {
const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
abcdefghijklmnopqrstuvwxyz\
0123456789)(*&^%$#@!~";

let mut rng = thread_rng();
let password: Option<String> = (0..30)
.map(|_| Some(*rng.choose(CHARSET)? as char))
.collect();

println!("{:?}", password);
}
```

[ex-parse-subprocess-output]: #ex-parse-subprocess-output
<a name="ex-parse-subprocess-output"></a>
## Run an external command and process stdout
Expand Down Expand Up @@ -1615,6 +1663,7 @@ fn main() {
[`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
[`BufReader`]: https://doc.rust-lang.org/std/io/struct.BufReader.html
[`chain_err`]: https://docs.rs/error-chain/*/error_chain/index.html#chaining-errors
[`choose`]: https://docs.rs/rand/*/rand/trait.Rng.html#method.choose
[`chrono::format::strftime`]: https://docs.rs/chrono/*/chrono/format/strftime/index.html
[`Command`]: https://doc.rust-lang.org/std/process/struct.Command.html
[`Datelike`]: https://docs.rs/chrono/*/chrono/trait.Datelike.html
Expand All @@ -1639,6 +1688,7 @@ fn main() {
[`File::try_clone`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.try_clone
[`File`]: https://doc.rust-lang.org/std/fs/struct.File.html
[`foreign_links`]: https://docs.rs/error-chain/*/error_chain/#foreign-links
[`gen_ascii_chars`]: https://docs.rs/rand/*/rand/trait.Rng.html#method.gen_ascii_chars
[`HashMap`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html
[`hmac::Signature`]: https://docs.rs/ring/*/ring/hmac/struct.Signature.html
[`IndependentSample::ind_sample`]: https://doc.rust-lang.org/rand/rand/distributions/trait.IndependentSample.html#tymethod.ind_sample
Expand Down
4 changes: 4 additions & 0 deletions src/intro.md
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Expand Up @@ -26,6 +26,8 @@ community. It needs and welcomes help. For details see
| [Generate random numbers within a range][ex-rand-range] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Generate random numbers with given distribution][ex-rand-dist] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Generate random values of a custom type][ex-rand-custom] | [![rand-badge]][rand] | [![cat-science-badge]][cat-science] |
| [Create random passwords from a set of alphanumeric characters][ex-rand-passwd] | [![rand-badge]][rand] | [![cat-os-badge]][cat-os] |
| [Create random passwords from a set of user-defined characters][ex-rand-choose] | [![rand-badge]][rand] | [![cat-os-badge]][cat-os] |
| [Run an external command and process stdout][ex-parse-subprocess-output] | [![regex-badge]][regex] | [![cat-os-badge]][cat-os] [![cat-text-processing-badge]][cat-text-processing] |
| [Run an external command passing it stdin and check for an error code][ex-parse-subprocess-input] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |
| [Run piped external commands][ex-run-piped-external-commands] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |
Expand Down Expand Up @@ -218,6 +220,8 @@ community. It needs and welcomes help. For details see
[ex-progress-with-range]: net.html#ex-progress-with-range
[ex-rand-custom]: basics.html#ex-rand-custom
[ex-rand-dist]: basics.html#ex-rand-dist
[ex-rand-choose]: basics.html#ex-rand-choose
[ex-rand-passwd]: basics.html#ex-rand-passwd
[ex-rand-range]: basics.html#ex-rand-range
[ex-rand]: basics.html#ex-rand
[ex-random-file-access]: basics.html#ex-random-file-access
Expand Down