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-rwxr-xr-xsrc/cpt-alternatives78
1 files changed, 65 insertions, 13 deletions
diff --git a/src/cpt-alternatives b/src/cpt-alternatives
index 3c98753..87946f0 100755
--- a/src/cpt-alternatives
+++ b/src/cpt-alternatives
@@ -2,31 +2,83 @@
# List and swap to alternatives
parser_definition() {
- setup REST help:usage -- "usage: ${0##*/} [-] [package file]"
- global_options silent
+ setup REST help:usage -- "usage: ${0##*/} package file"
+ msg -- "or: ${0##*/} [-p]"
+ msg -- "or: ${0##*/} -"
+ msg -- '' 'Options:'
+ flag preferred -p -- "List current owners of alternative files"
+ global_options
}
if [ -f ./cpt-lib ]; then . ./cpt-lib; else . cpt-lib; fi
# We don't need to be root in order to list alternatives, so skip privilege
# elevation if no arguments are passed to the script.
-[ -z "$1" ] || [ -w "$CPT_ROOT/" ] || [ "$uid" = 0 ] || {
+[ -z "$1" ] && [ -t 0 ] || [ -w "$CPT_ROOT/" ] || [ "$uid" = 0 ] || {
as_root "$0" "$@"
exit $?
}
+list_alternatives() {
+ # Go over each alternative and format the file name for listing.
+ # (pkg_name>usr>bin>ls)
+ set +f
+ for pkg in "$sys_db/../choices/"*; do
+ printf '%s\n' "${pkg##*/}"
+ done | sed 's|>|\t/|;s|>|/|g;/\*/d'
+}
+
+stdin_swap() {
+ # Swap packages by reading the standard input.
+ while IFS=$(printf '\t') read -r pkg path _; do
+ pkg_swap "$pkg" "$path"
+ done
+ exit
+}
+
case "$1" in
- -)
- while read -r pkg path; do
- pkg_swap "$pkg" "$path"
- done
- ;;
+ -) stdin_swap ;;
'')
- # Go over each alternative and format the file name for listing.
- # (pkg_name>usr>bin>ls)
- set +f; for pkg in "$sys_db/../choices/"*; do
- printf '%s\n' "${pkg##*/}"
- done | sed 's|>| /|; s|>|/|g; /\*/d'
+ # We still want to read the standard input when there are no arguments
+ # if the standard input is being used.
+ [ -t 0 ] || stdin_swap
+
+ if [ "$preferred" ]; then
+ # We are not using the pkg_owner() function here. It's much slower
+ # when searching items in bulk.
+ altlist=$(_tmp_create altlist)
+ pathlist=$(_tmp_create pathlist)
+ owners=$(_tmp_create owners)
+ list_alternatives | tee "$altlist" | sed 's,^[^\t]*\t,,' > "$pathlist"
+
+ # Save all matching items in a single file, so we don't ever read
+ # manifests again.
+ set +f
+ grep -Fxf "$pathlist" "$sys_db/"*/manifest > "$owners"
+ sys_db_esc=$(regesc "$sys_db")
+
+ while read -r pkg path; do
+ case $path in
+ # Running regesc() for each file slows us down, don't use
+ # it unless we detect a regular expression to escape.
+ *\[*|*\$*|*\\*|*.*|*^*) path_str=$(regesc "$path") ;;
+ *) path_str=$path
+ esac
+ grep_str="$sys_db_esc/[^/]*/manifest:$path_str"
+ owns=$(grep -x -- "$grep_str" "$owners") || owns=null
+ owns=${owns%:*} owns=${owns%/*} owns=${owns##*/}
+ printf '%s\t%s\t(owned by: %s)\n' "$pkg" "$path" "$owns"
+ done < "$altlist"
+
+ # We read the output of list_alternatives(), because that seems to
+ # be the faster option.
+ # list_alternatives | while read -r pkg path; do
+ # printf '%s %s (owned by: %s)\n' \
+ # "$pkg" "$path" "$(pkg_owner -lFx "$path" || out "null")"
+ # done
+ else
+ list_alternatives
+ fi
;;
*) pkg_swap "$@" ;;
esac