Add fallback to entry name if no username field

Will look for the username as before within the metadata of the entry,
but if there is no field which satisfies the conditions (by default
being named username, user, or login), will fall back to using the entry
name in pass (i.e. the filename).

fixes #3

pass-pick

@@ -71,6 +71,19 @@ _picker() {
         exit 1
     fi
 }
+# copies to clipboard, removes any trailing newlines,
+# and only keeps it in for 1 paste (1 loop to read in script, 1 to output)
+_clipper() {
+    if command -v wl-copy 1>/dev/null 2>/dev/null; then
+        wl-copy -o -n
+    elif command -v xclip 1>/dev/null 2>/dev/null; then
+        xclip -i -selection 'clipboard' -loops 2 -rmlastnl
+    elif command -v xsel 1>/dev/null 2>/dev/null; then
+        xsel -b
+    else
+        notify-send "No clipboard utility" "Install wl-copy, xclip or xsel."
+    fi
+}
 
 # parse, see https://unix.stackexchange.com/a/331965/8541
 _parse_config() {
@@ -164,7 +177,6 @@ clip_password() {
 _p_get_field() {
     local gp_entry="$1"
     local gp_field="$2"
-    local clip="$3"
 
     # return on first successfully returned key
     for key in $gp_field; do
@@ -173,23 +185,7 @@ _p_get_field() {
 
         # found entry
         if [ -n "$value" ]; then
-
-            if [ -n "$clip" ]; then
-                # copies to clipboard, removes any trailing newlines,
-                # and only keeps it in for 1 paste (1 loop to read in script, 1 to output)
-                if command -v wl-copy; then
-                    echo "$value" | wl-copy -o && break
-                elif command -v xclip; then
-                    echo "$value" | xclip -i -selection 'clipboard' -loops 2 -rmlastnl && break
-                elif command -v xsel; then
-                    echo "$value" | xsel -b && break
-                else
-                    notify-send "No clipboard utility" "Install wl-copy, xclip or xsel."
-                fi
-            else
-                echo "$value" && break
-            fi
-
+            echo "$value" && break
         fi
     done
 }
@@ -207,12 +203,16 @@ _p_get_key_value() {
 }
 
 # return username for argument passed
+# Prefers in-metadata username, falls back to filename
 show_username() {
-    _p_get_field "$1" "${PASS_USERNAME_FIELD}"
+    result=$(_p_get_field "$1" "${PASS_USERNAME_FIELD}")
+    if [ -z "$result" ]; then
+        echo "${1##*/}"
+    fi
 }
 
 clip_username() {
-    _p_get_field "$1" "${PASS_USERNAME_FIELD}" "-c"
+    show_username "$1" "${PASS_USERNAME_FIELD}" | _clipper
 }
 
 show_field() {
@@ -220,7 +220,7 @@ show_field() {
 }
 
 clip_field() {
-    _p_get_field "$1" "$2" "-c"
+    show_field "$1" "$2" | _clipper
 }
 
 list_fields() {