Examples of jline.console.history.MemoryHistory

jline.console.history.MemoryHistory
Non-persistent {@link History}. @author Marc Prud'hommeaux @author Jason Dillon @since 2.3

                consoleReader.setHistory(clientHistory());
                return consoleReader.readLine();
            }


            private MemoryHistory clientHistory() throws Exception {
                MemoryHistory history = new MemoryHistory();
                for (String historyItem : client.history()) {
                    history.add(historyItem);
                }
                return history;
            }


            private jline.console.completer.Completer clientCompleter() {

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        }
    }


    private static MemoryHistory getHistory()
    {
        MemoryHistory history;
        File historyFile = new File(getUserHome(), ".presto_history");
        try {
            history = new FileHistory(historyFile);
        }
        catch (IOException e) {
            System.err.printf("WARNING: Failed to load history file (%s): %s. " +
                    "History will not be available during this session.%n",
                    historyFile, e.getMessage());
            history = new MemoryHistory();
        }
        history.setAutoTrim(true);
        return history;
    }

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        }
    }


    private static MemoryHistory getHistory()
    {
        MemoryHistory history;
        File historyFile = new File(getUserHome(), ".presto_history");
        try {
            history = new FileHistory(historyFile);
        }
        catch (IOException e) {
            System.err.printf("WARNING: Failed to load history file (%s): %s. " +
                    "History will not be available during this session.%n",
                    historyFile, e.getMessage());
            history = new MemoryHistory();
        }
        history.setAutoTrim(true);
        return history;
    }

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        reader.setHistory(createSeededHistory());
        return reader;
    }


    private History createSeededHistory() {
        History history = new MemoryHistory();
        history.add("dir");
        history.add("cd c:\\");
        history.add("mkdir monkey");
        return history;
    }

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    }


    @Test
    public void testExpansion() throws Exception {
        ConsoleReader reader = createConsole();
        MemoryHistory history = new MemoryHistory();
        history.setMaxSize(3);
        history.add("foo");
        history.add("dir");
        history.add("cd c:\\");
        history.add("mkdir monkey");
        reader.setHistory(history);


        assertEquals("echo a!", reader.expandEvents("echo a!"));
        assertEquals("mkdir monkey ; echo a!", reader.expandEvents("!! ; echo a!"));
        assertEquals("echo ! a", reader.expandEvents("echo ! a"));

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    }


    @Test
    public void testNumericExpansions() throws Exception {
        ConsoleReader reader = createConsole();
        MemoryHistory history = new MemoryHistory();
        history.setMaxSize(3);


        // Seed history with three entries:
        // 1 history1
        // 2 history2
        // 3 history3
        history.add("history1");
        history.add("history2");
        history.add("history3");
        reader.setHistory(history);


        // Validate !n
        assertExpansionIllegalArgumentException(reader, "!0");
        assertEquals("history1", reader.expandEvents("!1"));
        assertEquals("history2", reader.expandEvents("!2"));
        assertEquals("history3", reader.expandEvents("!3"));
        assertExpansionIllegalArgumentException(reader, "!4");


        // Validate !-n
        assertExpansionIllegalArgumentException(reader, "!-0");
        assertEquals("history3", reader.expandEvents("!-1"));
        assertEquals("history2", reader.expandEvents("!-2"));
        assertEquals("history1", reader.expandEvents("!-3"));
        assertExpansionIllegalArgumentException(reader, "!-4");


        // Validate !!
        assertEquals("history3", reader.expandEvents("!!"));


        // Add two new entries. Because maxSize=3, history is:
        // 3 history3
        // 4 history4
        // 5 history5
        history.add("history4");
        history.add("history5");


        // Validate !n
        assertExpansionIllegalArgumentException(reader, "!0");
        assertExpansionIllegalArgumentException(reader, "!1");
        assertExpansionIllegalArgumentException(reader, "!2");

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    }


    @Test
    public void testArgsExpansion() throws Exception {
        ConsoleReader reader = createConsole();
        MemoryHistory history = new MemoryHistory();
        history.setMaxSize(3);
        reader.setHistory(history);


        // we can't go back to previous arguments if there are none
        try {
            reader.expandEvents("!$");
            fail("expected IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            assertEquals("!$: event not found", e.getMessage());
        }


        // if no arguments were given, it should expand to the command itself
        history.add("ls");
        assertEquals("ls", reader.expandEvents("!$"));


        // now we can expand to the last argument
        history.add("ls /home");
        assertEquals("/home", reader.expandEvents("!$"));


        //we always take the last argument
        history.add("ls /home /etc");
        assertEquals("/etc", reader.expandEvents("!$"));


        //make sure we don't add spaces accidentally
        history.add("ls /home  /foo ");
        assertEquals("/foo", reader.expandEvents("!$"));
    }

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        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        InputStream in = new ByteArrayInputStream("!f\r\n".getBytes());
        ConsoleReader reader = new ConsoleReader(in, baos);
        reader.setExpandEvents(true);
        reader.setBellEnabled(true);
        MemoryHistory history = new MemoryHistory();
        reader.setHistory(history);


        String line = reader.readLine();


        assertEquals("", line);
        assertEquals(0, history.size());
    }

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    }


    @Test
    public void testStoringHistory() throws Exception {
        ConsoleReader reader = createConsole("foo ! bar\r\n");
        MemoryHistory history = new MemoryHistory();
        reader.setHistory(history);
        reader.setExpandEvents(true);


        String line = reader.readLine();
        assertEquals("foo ! bar", line);


        history.previous();
        assertEquals("foo \\! bar", history.current());


        reader = createConsole("cd c:\\docs\r\n");
        history = new MemoryHistory();
        reader.setHistory(history);
        reader.setExpandEvents(true);


        line = reader.readLine();
        assertEquals("cd c:\\docs", line);


        history.previous();
        assertEquals("cd c:\\docs", history.current());
    }

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        assertHistory("^abc^def", reader);
    }


    private ConsoleReader createConsole(String input, boolean expandEvents, String... historyItems) throws Exception {
        ConsoleReader consoleReader = createConsole(input + "\r\n");
        MemoryHistory history = new MemoryHistory();
        if (historyItems != null) {
            for (String historyItem : historyItems) {
                history.add(historyItem);
            }
        }
        consoleReader.setHistory(history);
        consoleReader.setExpandEvents(expandEvents);
        return consoleReader;

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