protoflow 0.4.3

Protoflow implements flow-based programming (FBP) for Rust using Protocol Buffers messages.
Documentation 
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# Count Lines Example

This is a simple five-block example program that reads bytes from standard
input (stdin), decodes them into strings of newline-terminated lines, keeps a
line count of the number of lines read, and after reading all input lines writes
out that line count on standard output (stdout).

Note that unlike the trivial [`echo_lines`](../echo_lines) example program,
this program is not contingent on the terminal itself being line buffered.

## Block Diagram

```mermaid
block-beta
    columns 13
    ReadStdin space:2 Decode space:2 Count space:2 Encode space:2 WriteStdout
    ReadStdin-- "output → input" -->Decode
    Decode-- "output → input" -->Count
    Count-- "count → input" -->Encode
    Encode-- "output → input" -->WriteStdout

    classDef block height:48px,padding:8px;
    classDef hidden visibility:none;
    class ReadStdin block
    class Decode block
    class Count block
    class Encode block
    class WriteStdout block
```