Use die() / print to stderr for error conditions

To indicate that something went wrong (e.g. the task already was unprioritized).
Note: For actions that handle multiple ITEMs in a loop, we cannot use die() as that would abort processing of any following ITEM(s). Instead, use a status variable and set it to 1 on error, then exit at the end.

tests/t1200-pri.sh

@@ -90,6 +90,7 @@ TODO: 2 re-prioritized from (C) to (A).
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh pri 2 a
+=== 1
 2 (A) notice the sunflowers
 TODO: 2 already prioritized (A).
 

tests/t1500-do.sh

@@ -81,6 +81,7 @@ test_todo_session 'fail multiple do attempts' <<EOF
 TODO: 3 marked as done.
 
 >>> todo.sh -a do 3
+=== 1
 TODO: 3 is already marked done.
 EOF
 

tests/t1700-depri.sh

@@ -82,6 +82,7 @@ test_todo_session 'depriority of unprioritized task' <<EOF
 TODO: 3 of 3 tasks shown
 
 >>> todo.sh depri 3 2
+=== 1
 TODO: 3 is not prioritized.
 2 notice the sunflowers
 TODO: 2 deprioritized.

tests/t1800-del.sh

@@ -60,6 +60,7 @@ test_todo_session 'del with confirmation' <<EOF
 TODO: 3 of 3 tasks shown
 
 >>> printf n | todo.sh del 1
+=== 1
 Delete '(B) smell the uppercase Roses +flowers @outside'? (y/n)$SPACE
 TODO: No tasks were deleted.
 
@@ -71,10 +72,12 @@ TODO: No tasks were deleted.
 TODO: 3 of 3 tasks shown
 
 >>> printf x | todo.sh del 1
+=== 1
 Delete '(B) smell the uppercase Roses +flowers @outside'? (y/n)$SPACE
 TODO: No tasks were deleted.
 
 >>> echo | todo.sh del 1
+=== 1
 Delete '(B) smell the uppercase Roses +flowers @outside'? (y/n)$SPACE
 TODO: No tasks were deleted.
 

tests/t1910-deduplicate.sh

@@ -32,6 +32,7 @@ EOF
 
 test_todo_session 'deduplicate without duplicates' <<EOF
 >>> todo.sh deduplicate
+=== 1
 TODO: No duplicate tasks found
 EOF
 

tests/t2120-shorthelp.sh

@@ -47,7 +47,7 @@ echo 'export TODO_ACTIONS_DIR=$HOME/custom.actions' >> custom.cfg
 export TODOTXT_GLOBAL_CFG_FILE=global.cfg
 
 test_todo_session '-h and fatal error without config' <<EOF
->>> todo.sh -h | sed '/^ \\{0,2\\}[A-Z]/!d'
+>>> todo.sh -h 2>&1 | sed '/^ \\{0,2\\}[A-Z]/!d'
   Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
   Actions:
   Actions can be added and overridden using scripts in the actions
@@ -58,7 +58,7 @@ EOF
 
 # Config option comes too late; "Add-on Actions" is *not* mentioned here.
 test_todo_session '-h and fatal error with trailing custom config' <<EOF
->>> todo.sh -h -d custom.cfg | sed '/^ \\{0,2\\}[A-Z]/!d'
+>>> todo.sh -h -d custom.cfg 2>&1 | sed '/^ \\{0,2\\}[A-Z]/!d'
   Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
   Actions:
   Actions can be added and overridden using scripts in the actions
@@ -69,7 +69,7 @@ EOF
 
 # Config option processed; "Add-on Actions" is mentioned here.
 test_todo_session '-h output with preceding custom config' <<EOF
->>> todo.sh -d custom.cfg -h | sed '/^ \\{0,2\\}[A-Z]/!d'
+>>> todo.sh -d custom.cfg -h 2>&1 | sed '/^ \\{0,2\\}[A-Z]/!d'
   Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]
   Actions:
   Actions can be added and overridden using scripts in the actions