ENH: Add file completion for move.

This enhancement to todo_completion requires a small enhancement to the listfile action: When no SRC is specified, the list of text files in the todo.txt directory is printed. This is probably also useful on its own, and better than the original behavior of printing "TODO: File  does not exist."

Note: I intentionally omitted bullet-proof error handling ($TODO_DIR non-existing or no text files contained), to avoid over-complicating this.

tests/t1020-addtolistfile.sh

@@ -39,6 +39,24 @@ GARDEN: 2 added.
 GARDEN: 2 of 2 tasks shown
 EOF
 
+#
+# List available files
+#
+test_todo_session 'list available files' <<EOF
+>>> todo.sh listfile
+Files in the todo.txt directory:
+done.txt
+garden.txt
+report.txt
+todo.txt
+
+>>> TODOTXT_VERBOSE=0 todo.sh listfile
+done.txt
+garden.txt
+report.txt
+todo.txt
+EOF
+
 #
 # Filter
 #

todo.sh

@@ -57,7 +57,7 @@ shorthelp()
 		    list|ls [TERM...]
 		    listall|lsa [TERM...]
 		    listcon|lsc
-		    listfile|lf SRC [TERM...]
+		    listfile|lf [SRC [TERM...]]
 		    listpri|lsp [PRIORITY] [TERM...]
 		    listproj|lsprj [TERM...]
 		    move|mv ITEM# DEST [SRC]
@@ -211,11 +211,13 @@ help()
 		    lsc
 		      Lists all the task contexts that start with the @ sign in todo.txt.
 
-		    listfile SRC [TERM...]
-		    lf SRC [TERM...]
+		    listfile [SRC [TERM...]]
+		    lf [SRC [TERM...]]
 		      Displays all the lines in SRC file located in the todo.txt directory,
 		      sorted by priority with line  numbers.  If TERM specified, lists
 		      all lines that contain TERM in SRC file.
+		      Without any arguments, the names of all text files in the todo.txt
+		      directory are listed.
 
 		    listpri [PRIORITY] [TERM...]
 		    lsp [PRIORITY] [TERM...]
@@ -1049,10 +1051,15 @@ case $action in
 
 "listfile" | "lf" )
     shift  ## Was listfile, next $1 is file name
+    if [ $# -eq 0 ]; then
+        [ $TODOTXT_VERBOSE -gt 0 ] && echo "Files in the todo.txt directory:"
+        cd "$TODO_DIR" && ls -1 *.txt
+    else
         FILE="$1"
         shift  ## Was filename; next $1 is first search term
 
         _list "$FILE" "$@"
+    fi
     ;;
 
 "listcon" | "lsc" )

todo_completion

@@ -22,10 +22,17 @@ _todo()
     local completions
     if [ $COMP_CWORD -eq 1 ]; then
         completions="$allCommands $OPTS"
+    elif [[ $COMP_CWORD -gt 2 && ( \
+        "${COMP_WORDS[COMP_CWORD-2]}" =~ ^(move|mv)$ || \
+        "${COMP_WORDS[COMP_CWORD-3]}" =~ ^(move|mv)$ ) ]]; then
+        # "move ITEM# DEST [SRC]" has file arguments on positions 2 and 3.
+        completions=$(TODOTXT_VERBOSE=0 todo.sh command listfile)
     else
         case "$prev" in
             command)
                 completions=$COMMANDS;;
+            addto|listfile|lf)
+                completions=$(TODOTXT_VERBOSE=0 todo.sh command listfile);;
             -*) completions="$allCommands $OPTS";;
             *)  case "$cur" in
                     +*) completions=$(TODOTXT_VERBOSE=0 todo.sh command listproj);;