Add example flows (top-level) / (metacrate)

[oleksandrvoyager]

No description provided.

[SamuelSarle]

LGTM although for some reason I'm unable to run these:

• examples/csv_roundtrip.rs
• examples/hash_content.rs
• examples/log_directories.rs

Were you able to run those? They give import errors that I haven't been able to solve for TextBlocks::concat_strings_by, TextBlocks::decode_csv, TextBlocks::encode_csv, and HashBlocks::hash_sha2.
Specifically that would be the implementations missing for protoflow_blocks::System but of course all of those are present in the repo (lib/protoflow-blocks/src/system.rs)

Examples:

error[E0599]: no method named `encode_csv` found for mutable reference `&mut protoflow::protoflow_blocks::System` in the current scope
error[E0599]: no method named `decode_csv` found for mutable reference `&mut protoflow::protoflow_blocks::System` in the current scope
error[E0599]: no method named `hash_sha2` found for mutable reference `&mut protoflow::protoflow_blocks::System` in the current scope
error[E0599]: no method named `concat_strings_by` found for mutable reference `&mut protoflow::protoflow_blocks::System` in the current scope

[SamuelSarle]

In the future we should probably implement a Const helper which can output Bytes from a string. This behaves correctly but the line_encoder looks a bit funny here :)

[SamuelSarle]

Likewise for here as hex("$string\n") != hex("$string")

[SamuelSarle]

Same problem, with interesting behaviour with DecodeHex! This appends a newline at the end before sending it to DecodeHex which should result in an error. But DecodeHex uses Bytes::chunks_exact(2) which leaves the newline character alone as it's one byte:

The chunks are slices and do not overlap. If chunk_size does not divide the length of the
slice, then the last up to chunk_size-1 elements will be omitted and can be retrieved
from the remainder function of the iterator.

I think that DecodeHex shouldn't accept and ignore the last byte silently so we should make a PR so that it checks the content length is divisible by two.

[SamuelSarle]

Not able to run this file directly but copying the code to somewhere else you get

$ echo "Hello, World!" | sha256sum
c98c24b677eff44860afea6f493bbaec5bb1c4cbb209c6fc2bbb47f66ff2ad31

instead of the correct

$ echo -n "Hello, World!" | sha256sum
dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f

due to the s.encode_lines() adding a newline that also gets hashed.

[artob]

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