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#!/usr/bin/env bash
# This script extracts a package from a tool and prints it to stdout,
# excluding the 1; line that should mark the end of the package.
#
# All package lines are printed as-is (i.e. comments are included).
#
# Exits 0 on success, else 1 on warnings and errors.
die() {
echo "$1" >&2
exit 1
}
pkg="$1"
tool="$2"
if [ -z "$pkg" ] || [ -z "$tool" ]; then
die "Usage: $0 PACKAGE TOOL"
fi
# Package names cannot have - characters; they should be _ instead.
# This allows caller to specify "tool-name tool-name" to extract
# package tool_name from tool-name.
perl_pkg=${pkg//-/_}
pkg_start_line=$(grep --line-number "^# Package: $perl_pkg$" $tool | cut -d':' -f1)
if [ -z "$pkg_start_line" ]; then
pkg_start_line=$(grep --line-number "^package $perl_pkg;" $tool | cut -d':' -f1)
if [ -z "$pkg_start_line" ]; then
die "Cannot find package $perl_pkg in $tool"
fi
fi
# The package should end with a line that starts with 1;.
tail -n +$pkg_start_line $tool | awk '/^1;/ { print; exit; } { print }'
exit $?
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