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-rwxr-xr-xservices/lib/filter54
1 files changed, 54 insertions, 0 deletions
diff --git a/services/lib/filter b/services/lib/filter
new file mode 100755
index 00000000..93853895
--- /dev/null
+++ b/services/lib/filter
@@ -0,0 +1,54 @@
+#! /bin/sh
+#
+# usage:
+# export PATH="//services/lib:$PATH"
+# cd services
+# ls | filter owner == $LOGNAME | filter hasnt mail
+#
+set -euf
+
+main() {
+ case $# in
+ 2) op1 "$@";;
+ 3) op2 "$@";;
+ *) echo 'You are made of stupid!' >&2; exit 23;;
+ esac
+}
+
+# op1 OP SCHEMA
+op1() {
+ case "$1" in
+ has)
+ xargs grep -H "^$2:" \
+ | cut -d: -f1
+ ;;
+ hasnt)
+ a=$(mktemp)
+ b=$(mktemp)
+ trap "rm $a $b; trap - EXIT INT QUIT" EXIT INT QUIT
+ cat > $a
+ cat $a | xargs grep -H "^$2:" | cut -d: -f1 > $b
+ diff -u $b $a | sed -n '/^++/d;s/^+\(.*\)/\1/p' | grep .
+ esac
+}
+
+# op2 SCHEMA OP RHS
+op2() {
+ case "$2" in
+ ==)
+ xargs grep -H "^$1:$3$" \
+ | cut -d: -f1
+ ;;
+ !=)
+ xargs grep -H "^$1:" \
+ | grep -v ":$1:$3" \
+ | cut -d: -f1
+ ;;
+ ~=)
+ xargs grep -H "^$1:.*$3.*$" \
+ | cut -d: -f1
+ ;;
+ esac
+}
+
+main "$@"