The Prolog Console View lets you query Prolog predicates and display the results.

A query is typed in at the prompt and terminated with a full-stop ('.'). Hitting Enter after the full stop issues the query to the Prolog system and displays the results (if any). Typing a semicolon(';') displays the next result (or 'false', if there are no more results). Typing 'a' aborts the query.

The Prolog Console View includes a history mechanism (see keyboard shortcuts) and code completion.

The code completion of the Prolog Console View applies to built-in predicates and all user-defined predicates currently loaded into the Prolog system (including dynamically created ones). In the Prolog Console View, completion is triggered with Tab.

The Console's toolbar (in the upper right-hand corner of the Console Window) provides the following buttons:

• Create process: create a new, empty prolog process
• Follow Mode: When active, the editor focus will decide about the used runtime. Otherwise the runtime can be manualy be selected from the drop-down list.
• Activate GUI Tracer: This tells Prolog to use the graphical tracer for the next trace.
• Select All: Selects the entire console output.
• Cut
• Copy
• Paste
• Paste the name of the current editor file.
• Clear Console Output: Clears the console window but does not restart the current runtime.
• Restart: Restart the Prolog runtime associated to the console. Its current contents will be lost and a new, empty process will be started. After a restart you need to reconsult all files.

can be configured in the Eclipse-Preferences → PDT Preferences → Prolog Console → Font & Color

• The colored output is triggered by special keywords at the beginnig of each line: “INFO:” , “WARNING:” , “ERROR:”, “DEBUG:”.
• Indented lines with tab or two spaces belongs to the next keyword above.
• The keywords are not case-sensitive
• Colored output can be configured or (de)activated in the PDT-preferences.

writeln('Info: Hello World'),writeln('ERROR: Hello'),writeln('  World'), 
writeln('WArNinG: World Hello!'), writeln('debug: World Hello?'),
writeln('*** Hello World'),writeln('*** ERROR: Hello World'), writeln('***WArNinG: World Hello!').

results to