Connector-bash

== We're Using GitHub Under Protest ==

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We urge you to read about the Give up GitHub campaign from the Software Freedom Conservancy to understand some of the reasons why GitHub is not a good place to host FOSS projects.

If you are a contributor who personally has already quit using GitHub, please send mail to gitproj@f-hauri.ch for any comment or contributions without using GitHub directly.

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Copying:

As bash, this stuff is licensed under GNU GPL v3.0 or later.

Introduction:

In order to avoid multiple forks to some regular tools like date, bc and any line-by-line converter, based on

coproc bc -l

Then

echo "3*4" >&${COPROC[1]}
read -u $COPROC foo
echo $foo
12

echo >&${COPROC[1]} "pi=4*a(1)"
echo >&${COPROC[1]} "2*pi*12"
read -u $COPROC foo
echo $foo
75.39822368615503772256

There is a function for building I/O connectors:

. shell_connector.bash
newConnector /usr/bin/bc "-l" 1 1
myBc '4*a(1)' PI
declare -p PI
declare -- PI="3.14159265358979323844"

And for tools able to answer 0 or many lines, like SQL Clients, there is another function:

ostty=$(stty -g) && stty -echo
newSqlConnector /usr/bin/mysql "-h hostOrIp -p'$(head -n1)' -B database"
stty $ostty
mySqlReq answer 'SELECT * FROM mytable;'
declare -p answer answer_h answer_e

where all variables are arrays, first one answer will contain all rows, answer_h will hold header and answer_e error messages if any..