Some line thingy

file.cache.sh

# file.cache.sh;

# selective broadcast
file.cache.stream() { # heading alias
	eval printf %s \"\${$2[@]:$1}\";
}

# selective width broadcast
file.cache.stream.block () { # heading distance alias
	eval printf %s \"\${$3[@]:$1:$2}\";
}

# selective broadcast recieve
file.cache.accept.line.stream() { # heading alias
	readarray -O $1 $2;
}

# non-cumulative selective broadcast recieve
file.cache.construct.line.stream() {
	unset $1; file.cache.accept.line.stream 1 $1;
}

# cache a file
file.cache.lines() { # path alias
	# this procedure blatantly attempts to create a global variable.
	# long story short, in usage, don't overwrite any variables you did not create.
	file.cache.construct.line.stream "$2" < "$1";
	printf -v "$2[0]" %s "# $PWD@cachevar://$1; linemode/array; `date +%s`; $FUNCNAME; Extended Mapfile; Closed"$'\n';
}

# cache a stream
file.cache.line.stream() { # alias
	# this procedure blatantly attempts to create a global variable.
	# long story short, in usage, don't overwrite any variables you did not create.
	file.cache.construct.line.stream "$1";
	printf -v "$2[0]" %s "# $UID@stream:///dev/stdin; linemode/array; `date +%s`; $FUNCNAME; Extended Mapfile; Closed"$'\n';
}

# copy stream var
file.cache.line.stream.dup2() { # new alias
	file.cache.construct.line.stream $1 < <(file.cache.stream 1 $2);
	printf -v "$1[0]" %s "# $UID@var://$2; linemode/array; `date +%s`; $FUNCNAME; Extended Mapfile; Closed"$'\n';
}

# selective width broadcast recieve
file.cache.accept.line.block() { # heading distance alias
	readarray -O $1 -n $2 $3;
}

file.cache.void.line.block() { # heading distance alias
	file.cache.construct.line.stream $3 < <(
		file.cache.stream.block 1 "$(( $1 - 1 ))" $3;
		file.cache.stream "$(( $1 + $2 ))" $3;
	);
	printf -v "$3[0]" %s "# $UID@var://$3; linemode/array; `date +%s`; $FUNCNAME; Extended Mapfile; Closed"$'\n';
}

file.cache.void.line.stream() { # heading alias
	file.cache.construct.line.stream $2 < <(
		file.cache.stream.block 1 "$(( $1 - 1 ))" $2;
	);
	printf -v "$2[0]" %s "# $UID@var://$2; linemode/array; `date +%s`; $FUNCNAME; Extended Mapfile; Closed"$'\n';
}

# content stream injection
file.cache.insert.line.stream() { # heading alias
	 file.cache.accept.line.stream 1 $2 < <(
		file.cache.stream.block 1 "$(( $1 - 1 ))" $2; cat; file.cache.stream $1 $2;
	);
}

# content block injection
file.cache.insert.line.block() { # heading depth alias
	file.cache.accept.line.stream 1 $3 < <(file.cache.stream.block 1 "$(( $1 - 1 ))" $3;
		file.cache.accept.line.block 1 $2 _Cache;
		file.cache.stream 1 _Cache;
		file.cache.stream $1 $3;
	);
}

# tail stream mixer
file.cache.append.line.stream() { # alias
	file.cache.accept.line.stream 1 $1 < <(file.cache.stream 1 $1; cat);
}

# head stream mixer
file.cache.prepend.line.stream() { # alias
	file.cache.accept.line.stream 1 $1 < <(cat; file.cache.stream 1 $1);
}

# block tail mixer
file.cache.append.line.block() { # distance alias
	file.cache.accept.line.stream 1 $2 < <(
		file.cache.stream 1 $2;
		file.cache.accept.line.block 1 $1 _Cache;
		file.cache.stream 1 _Cache;
	);
}

# block head mixer
file.cache.prepend.line.block() { # distance alias
	file.cache.accept.line.stream 1 $2 < <(
		file.cache.accept.line.block 1 $1 _Cache;
		file.cache.stream 1 _Cache;
		file.cache.stream 1 $2;
	);
}

# reconstruct line stream data
file.cache.rescan.lines() { # alias
	file.cache.line.stream $1 < <(file.cache.stream 1 $1);
}

# read an element from an array
file.cache.get.record() { # heading alias
	eval printf %s \"\${$2[$1]}\";
}

# count the number of elements in an array type
file.cache.get.record.count() {
	eval printf %i'\\n' '$(('\${#$1[@]}' - 1))';
}

# write data to an index
file.cache.set.record() { # heading alias
	IFS='' read -rN0 $2 < <(echo "${!2/Closed/Dirty}");
	IFS='' read -rN0 $2[$1];
}

file.cache.get.header() { # alias
	printf %s\\n "${!1}";
}

# display the bash source code of this resource
file.cache.export() { # alias
	declare -p $1;
}