ENH: Better completion for custom add-ons via new listaddons command.

The todo_completion had the problem that it didn't consider the todo.cfg itself for the location of TODO_ACTIONS_DIR, it just tried the default location or a globally exported config value. With the injection of custom configuration now in place, we can actually delegate the listing to todo.sh itself.
The added built-in "listaddons" command is used for that; it may also be helpful for troubleshooting or to find out about available add-ons. (But the help / shorthelp commands offer more information.)

Additionally, completion is now more precise; only executable actions and no subdirs are listed now; this is also covered by the enhanced test.

The last bonus: The custom add-on actions are now only determined when there's actually completion of commands.

.gitignore

@@ -1,6 +1,3 @@
 VERSION-FILE
 tests/test-results
 tests/trash\ directory.*
-done.txt
-report.txt
-todo.txt

tests/actions-test-lib.sh

@@ -1,18 +0,0 @@
-#!/bin/bash
-
-make_action()
-{
-    unset TODO_ACTIONS_DIR
-    [ -d .todo.actions.d ] || mkdir .todo.actions.d
-    cat > ".todo.actions.d/$1" <<EOF
-#!/bin/bash
-[ "\$1" = "usage" ] && {
-    echo "    $1 ITEM#[, ITEM#, ...] [TERM...]"
-    echo "      This custom action does $1."
-    echo ""
-    exit
-}
-echo "custom action $1"
-EOF
-chmod +x ".todo.actions.d/$1"
-}

tests/t2100-help.sh

@@ -1,44 +0,0 @@
-#!/bin/bash
-#
-
-test_description='help functionality
-
-This test covers the help output.
-'
-. ./actions-test-lib.sh
-. ./test-lib.sh
-
-# Note: To avoid having to adapt the test whenever the help documentation
-# slightly changes, only check for the section headers.
-test_todo_session 'help output' <<EOF
->>> todo.sh help | sed '/^  [A-Z]/!d'
-  Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
-  Options:
-  Built-in Actions:
-EOF
-
-test_todo_session 'verbose help output' <<EOF
->>> todo.sh -v help | sed '/^  [A-Z]/!d'
-  Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
-  Options:
-  Built-in Actions:
-EOF
-
-test_todo_session 'very verbose help output' <<EOF
->>> todo.sh -vv help | sed '/^  [A-Z]/!d'
-  Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
-  Options:
-  Environment variables:
-  Built-in Actions:
-EOF
-
-make_action "foo"
-test_todo_session 'help output with custom action' <<EOF
->>> todo.sh -v help | sed '/^  [A-Z]/!d'
-  Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
-  Options:
-  Built-in Actions:
-  Add-on Actions:
-EOF
-
-test_done

tests/t2110-help-action.sh

@@ -1,66 +0,0 @@
-#!/bin/bash
-
-test_description='built-in actions help functionality
-
-This test checks listing the usage help of a built-in action.
-'
-. ./test-lib.sh
-
-test_todo_session 'nonexisting action help' <<'EOF'
->>> todo.sh help doesnotexist
-TODO: No action "doesnotexist" exists.
-=== 1
-
->>> todo.sh help hel
-TODO: No action "hel" exists.
-=== 1
-
->>> todo.sh help h
-TODO: No action "h" exists.
-=== 1
-EOF
-
-test_todo_session 'single action help' <<'EOF'
->>> todo.sh help shorthelp
-    shorthelp
-      List the one-line usage of all built-in and add-on actions.
-\
-EOF
-
-test_todo_session 'multiple actions help' <<'EOF'
->>> todo.sh help shorthelp append
-    shorthelp
-      List the one-line usage of all built-in and add-on actions.
-\
-    append ITEM# "TEXT TO APPEND"
-    app ITEM# "TEXT TO APPEND"
-      Adds TEXT TO APPEND to the end of the task on line ITEM#.
-      Quotes optional.
-\
-EOF
-
-test_todo_session 'short and long form of action help' <<'EOF'
->>> todo.sh help append
-    append ITEM# "TEXT TO APPEND"
-    app ITEM# "TEXT TO APPEND"
-      Adds TEXT TO APPEND to the end of the task on line ITEM#.
-      Quotes optional.
-\
-
->>> todo.sh help app
-    app ITEM# "TEXT TO APPEND"
-      Adds TEXT TO APPEND to the end of the task on line ITEM#.
-      Quotes optional.
-\
-EOF
-
-test_todo_session 'mixed existing and nonexisting action help' <<'EOF'
->>> todo.sh help shorthelp doesnotexist list
-    shorthelp
-      List the one-line usage of all built-in and add-on actions.
-\
-TODO: No action "doesnotexist" exists.
-=== 1
-EOF
-
-test_done

tests/t6100-completion-help.sh

@@ -1,20 +0,0 @@
-#!/bin/bash
-#
-
-test_description='Bash help completion functionality
-
-This test checks todo_completion of actions for usage help.
-'
-. ./actions-test-lib.sh
-. ./test-lib.sh
-make_action "zany"
-make_action "aardvark"
-
-readonly ACTIONS='add a addto addm append app archive command del rm depri dp do help list ls listaddons listall lsa listcon lsc listfile lf listpri lsp listproj lsprj move mv prepend prep pri p replace report shorthelp'
-readonly ADDONS='aardvark zany'
-
-test_todo_completion 'all actions after help' 'todo.sh help ' "$ACTIONS $ADDONS"
-test_todo_completion 'all actions after command help' 'todo.sh command help ' "$ACTIONS $ADDONS"
-test_todo_completion 'actions beginning with a' 'todo.sh help a' 'add a addto addm append app archive aardvark'
-
-test_done

tests/t8000-actions.sh

@@ -4,9 +4,19 @@ test_description='custom actions functionality
 
 This test covers the contract between todo.sh and custom actions.
 '
-. ./actions-test-lib.sh
 . ./test-lib.sh
 
+unset TODO_ACTIONS_DIR
+mkdir .todo.actions.d
+make_action()
+{
+	cat > ".todo.actions.d/$1" <<- EOF
+	#!/bin/bash
+	echo "custom action $1"
+EOF
+chmod +x ".todo.actions.d/$1"
+}
+
 make_action "foo"
 test_todo_session 'executable action' <<EOF
 >>> todo.sh foo

tests/t8010-listaddons.sh

@@ -1,44 +0,0 @@
-#!/bin/bash
-
-test_description='listaddons functionality
-
-This test checks listing of custom actions.
-'
-. ./actions-test-lib.sh
-. ./test-lib.sh
-
-test_todo_session 'no custom actions' <<EOF
->>> todo.sh listaddons
-EOF
-
-make_action "foo"
-test_todo_session 'one custom action' <<EOF
->>> todo.sh listaddons
-foo
-EOF
-
-make_action "bar"
-make_action "ls"
-make_action "quux"
-test_todo_session 'multiple custom actions' <<EOF
->>> todo.sh listaddons
-bar
-foo
-ls
-quux
-EOF
-
-chmod -x .todo.actions.d/foo
-# On Cygwin, clearing the executable flag may have no effect, as the Windows ACL
-# may still grant execution rights. In this case, we skip the test.
-if [ -x .todo.actions.d/foo ]; then
-    SKIP_TESTS="${SKIP_TESTS}${SKIP_TESTS+ }t8010.4"
-fi
-test_todo_session 'nonexecutable action' <<EOF
->>> todo.sh listaddons
-bar
-ls
-quux
-EOF
-
-test_done

tests/t8020-actions-help.sh

@@ -1,76 +0,0 @@
-#!/bin/bash
-
-test_description='custom actions help functionality
-
-This test checks listing the usage help of a custom action.
-'
-. ./actions-test-lib.sh
-. ./test-lib.sh
-
-test_todo_session 'custom action help with no custom action directory' <<'EOF'
->>> todo.sh help foo
-TODO: No action "foo" exists.
-=== 1
-EOF
-
-make_action "foo"
-make_action "bar"
-make_action "ls"
-make_action "quux"
-
-test_todo_session 'custom action help' <<'EOF'
->>> todo.sh help foo
-    foo ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does foo.
-\
-
->>> todo.sh help bar
-    bar ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does bar.
-\
-EOF
-
-test_todo_session 'multiple custom actions help' <<'EOF'
->>> todo.sh help foo bar
-    foo ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does foo.
-\
-    bar ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does bar.
-\
-EOF
-
-test_todo_session 'nonexisting action help' <<'EOF'
->>> todo.sh help doesnotexist
-TODO: No action "doesnotexist" exists.
-=== 1
-
->>> todo.sh help foo doesnotexist bar
-    foo ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does foo.
-\
-TODO: No action "doesnotexist" exists.
-=== 1
-EOF
-
-test_todo_session 'mixed built-in and custom actions help' <<'EOF'
->>> todo.sh help foo shorthelp bar
-    foo ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does foo.
-\
-    shorthelp
-      List the one-line usage of all built-in and add-on actions.
-\
-    bar ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does bar.
-\
-EOF
-
-test_todo_session 'custom override of built-in action help' <<'EOF'
->>> todo.sh help ls
-    ls ITEM#[, ITEM#, ...] [TERM...]
-      This custom action does ls.
-\
-EOF
-
-test_done

todo.sh

@@ -54,7 +54,7 @@ shorthelp()
 		    del|rm ITEM# [TERM]
 		    depri|dp ITEM#[, ITEM#, ITEM#, ...]
 		    do ITEM#[, ITEM#, ITEM#, ...]
-		    help [ACTION...]
+		    help
 		    list|ls [TERM...]
 		    listall|lsa [TERM...]
 		    listaddons
@@ -154,12 +154,6 @@ help()
 
 
 	EndVerboseHelp
-        actionsHelp
-        addonHelp
-}
-
-actionsHelp()
-{
     cat <<-EndActionsHelp
 		  Built-in Actions:
 		    add "THING I NEED TO DO +project @context"
@@ -206,9 +200,8 @@ actionsHelp()
 		    do ITEM#[, ITEM#, ITEM#, ...]
 		      Marks task(s) on line ITEM# as done in todo.txt.
 
-		    help [ACTION...]
+		    help
-		      Display help about usage, options, built-in and add-on actions,
+		      Display this help message.
-		      or just the usage help for the passed ACTION(s).
 
 		    list [TERM...]
 		    ls [TERM...]
@@ -285,6 +278,9 @@ actionsHelp()
 		      List the one-line usage of all built-in and add-on actions.
 
 	EndActionsHelp
+
+        addonHelp
+    exit 1
 }
 
 addonHelp()
@@ -306,25 +302,6 @@ addonHelp()
     fi
 }
 
-actionUsage()
-{
-    for actionName
-    do
-        action="${TODO_ACTIONS_DIR}/${actionName}"
-        if [ -f "$action" -a -x "$action" ]; then
-            "$action" usage
-        else
-            builtinActionUsage=$(actionsHelp | sed -n -e "/^    ${actionName//\//\\/} /,/^\$/p" -e "/^    ${actionName//\//\\/}$/,/^\$/p")
-            if [ "$builtinActionUsage" ]; then
-                echo "$builtinActionUsage"
-                echo
-            else
-                die "TODO: No action \"${actionName}\" exists."
-            fi
-        fi
-    done
-}
-
 die()
 {
     echo "$*"
@@ -1098,19 +1075,13 @@ case $action in
     ;;
 
 "help" )
-    shift  ## Was help; new $1 is first help topic / action name
+    if [ -t 1 ] ; then # STDOUT is a TTY
-    if [ $# -gt 0 ]; then
+        if which "${PAGER:-less}" >/dev/null 2>&1; then
-        # Don't use PAGER here; we don't expect much usage output from one / few actions.
+            # we have a working PAGER (or less as a default)
-        actionUsage "$@"
+            help | "${PAGER:-less}" && exit 0
-    else
-        if [ -t 1 ] ; then # STDOUT is a TTY
-            if which "${PAGER:-less}" >/dev/null 2>&1; then
-                # we have a working PAGER (or less as a default)
-                help | "${PAGER:-less}" && exit 0
-            fi
         fi
-        help # just in case something failed above, we go ahead and just spew to STDOUT
     fi
+    help # just in case something failed above, we go ahead and just spew to STDOUT
     ;;
 
 "shorthelp" )

todo_completion

@@ -28,8 +28,6 @@ _todo()
         case "$prev" in
             command)
                 completions=$COMMANDS;;
-            help)
-                completions="$COMMANDS $(eval TODOTXT_VERBOSE=0 $_todo_sh command listaddons)";;
             addto|listfile|lf)
                 completions=$(eval TODOTXT_VERBOSE=0 $_todo_sh command listfile);;
             -*) completions="$COMMANDS $(eval TODOTXT_VERBOSE=0 $_todo_sh command listaddons) $OPTS";;
@@ -60,7 +58,7 @@ _todo()
                             # a safety check of the ls action output.
                             local todo=$( \
                                 eval TODOTXT_VERBOSE=0 $_todo_sh '-@ -+ -p -x command ls "^ *${cur} "' | \
-                                sed -e 's/^ *[0-9]\{1,\} //' -e 's/\((.) \)[0-9]\{2,4\}-[0-9]\{2\}-[0-9]\{2\} /\1/' \
+                                sed -e 's/^ *[0-9]\+ //' -e 's/\((.) \)[0-9]\{2,4\}-[0-9]\{2\}-[0-9]\{2\} /\1/' \
                                     -e 's/\([xX] \)\([0-9]\{2,4\}-[0-9]\{2\}-[0-9]\{2\} \)\{1,2\}/\1/' \
                                     -e 's/[[:space:]]*$//' \
                                     -e '1q' \