bin/tm: handle multiple-matches better

bin/tm

@@ -1,7 +1,4 @@
 #!/bin/bash
-# Configuration
-DATADIR=$HOME/data/screen
-
 # Variables
 #DRY=echo
 DRY=
@@ -58,15 +55,28 @@ fi
 
 echo Looking for $TARGET
 
-MATCH=$(tmux ls | grep "$TARGET")
-if [ "$MATCH" == "" ] ; then
-    # Use the name as what they passed.
-    SESSION_NAME="$TARGET"
-    COMMAND="new -s $SESSION_NAME"
-else
-    # Pull out the existing session name.
-    SESSION_NAME=$(echo "$MATCH" | sed -e 's/:.*$//')
-    COMMAND="at -t $SESSION_NAME"
+MATCHCOUNT=$(tmux ls | grep "$TARGET" | wc -l)
+if [ $MATCHCOUNT -eq 0 ] ; then
+  # Use the name as what they passed.
+  SESSION_NAME="$TARGET"
+  COMMAND="new -s $SESSION_NAME"
+elif [ $MATCHCOUNT -gt 1 ] ; then
+  found_multiple=1
+  OLD_TARGET=$TARGET
+  TARGET="^$OLD_TARGET:"
+  MATCHCOUNT=$(tmux ls | grep "$TARGET" | wc -l)
+  if [ $MATCHCOUNT -ne 1 ] ; then
+    echo "Confused by session naming; $OLD_TARGET matches too many sessions."
+    $DRY tmux ls | grep $OLD_TARGET
+    exit 1
+  fi
+fi
+
+if [ $MATCHCOUNT -eq 1 ] ; then
+  MATCH=$(tmux ls | grep "$TARGET")
+  # Pull out the existing session name.
+  SESSION_NAME=$(echo "$MATCH" | sed -e 's/:.*$//')
+  COMMAND="at -t $SESSION_NAME"
 fi
 
 if [ "$COMMAND" != "" ] ; then