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-rw-r--r--lib/controlfields110
1 files changed, 110 insertions, 0 deletions
diff --git a/lib/controlfields b/lib/controlfields
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+++ b/lib/controlfields
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+#! /bin/sh
+#
+# opkhelper
+# lib/controlfields
+# Functions for parsing control fields.
+#
+# Copyright (C) 2012 Patrick "P. J." McDermott
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Gets a simple control field.
+# Parameters:
+# package name (if omitted, source package control file is read)
+# field name
+# Output:
+# field value
+# Return value:
+# 0 on success
+# 1 on missing field
+# 255 on invalid invocation
+#oh_get_simple_field()
+#{
+# case ${#} in
+# 1)
+# _control=../control
+# _field=${1}
+# ;;
+# 2)
+# _control=../${1}.pkg/control
+# _field=${2}
+# ;;
+# *)
+# return 255
+# ;;
+# esac
+#
+# _value=`sed -n "s/^${_field}:[[:space:]]*\([[:space:]]\)[[:space:]]*$/\\1/p"
+# ${_control}`
+#
+# [ -z "${_value}" ] && return 1
+# echo "${_value}"
+# return 0
+#}
+
+# Gets a folded or multiline control field.
+# Parameters:
+# package name (if omitted, source package control file is read)
+# field name
+# Output:
+# field value
+# Return value:
+# 0 on success
+# 1 on missing field
+# 255 on invalid invocation
+#oh_get_folded_multiline_field()
+oh_get_field()
+{
+ case ${#} in
+ 1)
+ _control=../control
+ _field=${1}
+ ;;
+ 2)
+ _control=../${1}.pkg/control
+ _field=${2}
+ ;;
+ *)
+ return 255
+ ;;
+ esac
+
+ # Force the 'read' utility to read until a line break character.
+ _OLDIFS="${IFS}"
+ IFS='
+'
+
+ # Parse the control file.
+ _value=''
+ while read -r _line; do
+ if [ -z ${_value} ]; then
+ _value=$(echo "${_line}" | sed -n
+ "s/^${_field}:[[:space:]]*\([[:space:]]\)[[:space:]]*$/\\1/p")
+ else
+ if echo "${_line}" | grep '^ ' > /dev/null; then
+ _value="${_value}
+${_line}"
+ else
+ break
+ fi
+ fi
+ done < ${_control}
+
+ # Reset the IFS.
+ IFS="${_OLDIFS}"
+
+ [ -z "${_value}" ] && return 1
+ echo "${_value}"
+ return 0
+}