rewrite in rust

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-Black box tests for clab
-========================
-
-Clab is a command line address book application.
-It has no interactive features, so black box testing it
-is fairly easy.
-
-Let's start with an empty database.
-
-    SCENARIO empty database
-    GIVEN an empty database
-
-    WHEN listing all records
-    THEN nothing is listed
-
-    WHEN searching for Alice
-    THEN output is empty
-
-    WHEN mutt-querying for Alice
-    THEN no matches
-
-Next, let's add records for Alice and Bob, and make
-sure searches find only the right records.
-
-    SCENARIO database with records
-    GIVEN an empty database
-    AND a record for "Alice Atherton" with e-mail alice@example.com
-    AND a record for "Bob Bobbington" with e-mail bob@example.com
-
-    WHEN listing all records
-    THEN Alice is found
-    AND Bob is found
-
-    WHEN searching for Alice
-    THEN Alice is found
-    AND Bob is not found
-
-    WHEN mutt-querying for Alice
-    THEN Alice is found
-    AND alice@example.com is found
-    AND Bob is not found
-    AND bob@example.com is not found
-
-Put several records in one file.
-
-    SCENARIO files with multiple records
-    GIVEN an empty database
-    AND records for Alice (alice@example.com) and Bob (bob@example.com)
-    WHEN listing all records
-    THEN Alice is found
-    AND Bob is found
-
-    WHEN searching for Alice
-    THEN Alice is found
-    AND Bob is not found
-
-    WHEN mutt-querying for Alice
-    THEN Alice is found
-    AND alice@example.com is found
-    AND Bob is not found
-    AND bob@example.com is not found
-
-Sometimes the same person is in the database multiple times
-(e.g., different records for home and work personas, where the
-work persona is automatically generated from LDAP or something).
-In this case, only find each person once.
-
-    GIVEN another record for Alice (alice@example.com)
-    WHEN mutt-querying for example
-    THEN Alice is found only once
-
-Implementation
---------------
-
-These implement the various steps.
-
-    IMPLEMENTS GIVEN an empty database
-    mkdir "$DATADIR/db"
-
-    IMPLEMENTS GIVEN a record for "([^"]+)" with e-mail (.*)
-    cat << EOF > "$DATADIR/db/$MATCH_1.yaml"
-    name: $MATCH_1
-    email: $MATCH_2
-    EOF
-
-    IMPLEMENTS GIVEN records for (\S+) \((\S+)\) and (\S+) \((\S+)\)
-    cat << EOF > "$DATADIR/db/foo.yaml"
-    - name: $MATCH_1
-      email: $MATCH_2
-    - name: $MATCH_3
-      email: $MATCH_4
-    EOF
-
-    IMPLEMENTS GIVEN another record for (\S+) \((\S+)\)
-    cat << EOF >> "$DATADIR/db/foo.yaml"
-    - name: $MATCH_1
-      email: $MATCH_2
-    EOF
-
-    IMPLEMENTS WHEN listing all records
-    ./clab --no-default-config --db "$DATADIR/db" list > "$DATADIR/output"
-
-    IMPLEMENTS WHEN searching for (.*)
-    ./clab --no-default-config --db "$DATADIR/db" find "$MATCH_1" > "$DATADIR/output"
-
-    IMPLEMENTS WHEN mutt-querying for (.*)
-    ./clab --no-default-config --db "$DATADIR/db" mutt-query "$MATCH_1" > "$DATADIR/output" || true
-
-    IMPLEMENTS THEN nothing is listed
-    stat -c %s "$DATADIR/output" | grep -x 0
-
-    IMPLEMENTS THEN output is empty
-    stat -c %s "$DATADIR/output" | grep -x 0
-
-    IMPLEMENTS THEN no matches
-    diff -u "$DATADIR/output" - << EOF
-    No matches
-    EOF
-
-    IMPLEMENTS THEN (.*) is found
-    set -x
-    grep -F "$MATCH_1" "$DATADIR/output"
-
-    IMPLEMENTS THEN (.*) is found only once
-    n=$(grep -cF "$MATCH_1" "$DATADIR/output")
-    if [ "$n" != 1 ]
-    then
-	echo "$MATCH_1 was found $n times, expected 1" 1>&2
-	exit 1
-    fi
-
-    IMPLEMENTS THEN (.*) is not found
-    ! grep -F "$MATCH_1" "$DATADIR/output"