You can use `(concat &quot;foo&quot; &quot;bar&quot;)` rather than `(concatenate &#39;string &quot;foo&quot; &quot;bar&quot;)`.  Both work, but of course the former is shorter.

Use *expand-file-name* to build filenames relative to a directory:

    (let ((default-directory &quot;~/smcho/time/&quot;))
      (setq org-default-notes-file-path (expand-file-name &quot;notes.org&quot;))
      (setq todo-file-path (expand-file-name &quot;gtd.org&quot;))
      (setq journal-file-path (expand-file-name &quot;journal.org&quot;))
      (setq today-file-path (expand-file-name &quot;2010.org&quot;)))



First of all, don&#39;t use &quot;_&quot;; use &#39;-&#39; instead.
Insert this into your .emacs and restart emacs (or evaluate the S-exp in a buffer) to see the effects:

    (setq org-base-path (expand-file-name &quot;~/smcho/time&quot;))
    
    (setq org-default-notes-file-path (format &quot;%s/%s&quot; org-base-path &quot;notes.org&quot;)
          todo-file-path              (format &quot;%s/%s&quot; org-base-path &quot;gtd.org&quot;)
          journal-file-path           (format &quot;%s/%s&quot; org-base-path &quot;journal.org&quot;)
          today-file-path             (format &quot;%s/%s&quot; org-base-path &quot;2010.org&quot;))


Is is possible to rename an Azure Storage Blob using the Azure Storage API from a Web Role? The only solution I have at the moment is to copy the blob to a new blob with the correct name and delete the old one.

Azure Storage Blob Rename

I&#39;m testing a method that logs warnings when something went wrong and returns null.  
something like:  

    private static final Logger log = Logger.getLogger(Clazz.class.getName());
    ....
    if (file == null || !file.exists()) {
      // if File not found
      log.warn(&quot;File not found: &quot;+file.toString());
    } else if (!file.canWrite()) {
      // if file is read only
      log.warn(&quot;File is read-only: &quot;+file.toString());
    } else {
      // all checks passed, can return an working file.
      return file;
    }
    return null;

i&#39;d like to test with junit that a warning was issued, in addition to returning null, in all cases (e.g. file not found, file is read-only).  
any ideas?  
thanks, asaf :-)


----------
### UPDATE ###
My implementation of Aaron&#39;s answer (plus peter&#39;s remark):  

    public class UnitTest {
    ...
    
    @BeforeClass
    public static void setUpOnce() {
      appenders = new Vector&lt;Appender&gt;(2);
      // 1. just a printout appender:
      appenders.add(new ConsoleAppender(new PatternLayout(&quot;%d [%t] %-5p %c - %m%n&quot;)));
      // 2. the appender to test against:
      writer = new StringWriter();
      appenders.add(new WriterAppender(new PatternLayout(&quot;%p, %m%n&quot;),writer));
    }
  
    @Before
    public void setUp() {
      // Unit Under Test:
      unit = new TestUnit();
      // setting test appenders:
      for (Appender appender : appenders) {
        TestUnit.log.addAppender(appender);
      }
      // saving additivity and turning it off:
      additivity = TestUnit.log.getAdditivity();
      TestUnit.log.setAdditivity(false);
    }
  
    @After
    public void tearDown() {
      unit = null;
      for (Appender appender : appenders) {
        TestUnit.log.removeAppender(appender);
      }
      TestUnit.log.setAdditivity(additivity);
    }
  
    @Test
    public void testGetFile() {
      // start fresh:
      File file;
      writer.getBuffer().setLength(0);
  
      // 1. test null file:
      System.out.println(&quot; 1. test null file.&quot;);
      file = unit.getFile(null);
      assertNull(file);
      assertTrue(writer.toString(), writer.toString().startsWith(&quot;WARN, File not found&quot;));
      writer.getBuffer().setLength(0);
  
      // 2. test empty file:
      System.out.println(&quot; 2. test empty file.&quot;);
      file = unit.getFile(&quot;&quot;);
      assertNull(file);
      assertTrue(writer.toString(), writer.toString().startsWith(&quot;WARN, File not found&quot;));
      writer.getBuffer().setLength(0);
    }


thanks guys,

How can I test with junit that a warning was logged with log4j?

I need to concatenate path string as follows, so I added the following lines to my `.emacs` file:

    (setq org_base_path &quot;~/smcho/time/&quot;)
    (setq org-default-notes-file-path (concatenate &#39;string org_base_path &quot;notes.org&quot;))
    (setq todo-file-path (concatenate &#39;string org_base_path &quot;gtd.org&quot;))
    (setq journal-file-path (concatenate &#39;string org_base_path &quot;journal.org&quot;))
    (setq today-file-path (concatenate &#39;string org_base_path &quot;2010.org&quot;))

When I do &lt;kbd&gt;C-h v&lt;/kbd&gt; `today-file-path` &lt;kbd&gt;RET&lt;/kbd&gt; to check, it has no variable assigned. 

What&#39;s wrong with my code? Is there any other way to concatenate the path string?

## EDIT
I found that the problem was caused by the wrong setup, the code actually works. Thanks for the answers which are better than my code.

Concatenate strings in elisp

I need to concatenate path string as follows, so I added the following lines to my <code>.emacs</code> file:
<pre><code class="hljs language-lua">(setq org_base_path "~/smcho/time/")
(setq org-default-notes-file-path (concatenate 'string org_base_path "notes.org"))
(setq todo-file-path (concatenate 'string org_base_path "gtd.org"))
(setq journal-file-path (concatenate 'string org_base_path "journal.org"))
(setq today-file-path (concatenate 'string org_base_path "2010.org"))
</code></pre>
When I do <kbd>C-h v</kbd> <code>today-file-path</code> <kbd>RET</kbd> to check, it has no variable assigned.
What's wrong with my code? Is there any other way to concatenate the path string?
<h4 id="edit"><a aria-hidden="true" tabindex="-1" href="#edit"></a>EDIT</h4>
I found that the problem was caused by the wrong setup, the code actually works. Thanks for the answers which are better than my code.

I&#39;ve learned Clojure previously and really like the language. I also love Emacs and have hacked some simple stuff with Emacs Lisp. There is one thing which prevents me mentally from doing anything more substantial with Elisp though. It&#39;s the concept of dynamic scoping. I&#39;m just scared of it since it&#39;s so alien to me and smells like semi-global variables. 

So with variable declarations I don&#39;t know which things are safe to do and which are dangerous. From what I&#39;ve understood, variables set with setq fall under dynamic scoping (is that right?) What about let variables? Somewhere I&#39;ve read that let allows you to do plain lexical scoping, but somewhere else I read that let vars also are dynamically scoped. 

I quess my biggest worry is that my code (using setq or let) accidentally breaks some variables from platform or third-party code that I call or that after such call my local variables are messed up accidentally. How can I avoid this? 

Are there a few simple rules of thumb that I can just follow and know exactly what happens with the scope without being bitten in some weird, hard-to-debug way?


How to live with Emacs Lisp dynamic scoping?

What is the emacs equivalent of vi&#39;s &lt;kbd&gt;dd&lt;/kbd&gt;? I want to delete the current line. Tried &lt;kbd&gt;CTRL&lt;/kbd&gt; + &lt;kbd&gt;k&lt;/kbd&gt; but it only deletes _from_ current position.  

How can I delete the current line in Emacs?

I&#39;d like to use 2 spaces for my indents instead of 4. I can change the default behavior of C mode using: 

    (setq c-basic-offset 2)

How do I change this in javascript mode?


How to change the indentation width in emacs javascript mode

I tried to edit my init file. Is there any possible way to quickly jump into function definition of other .el file that has already loaded/required ?

I remember doing this once, but don&#39;t remember how...

Emacs: how to jump to function definition in .el file?

I have started the painful first steps of using emacs to edit an HTML file with both HTML tags and javascript content.   I have installed nxhtml and tried using it - i.e set up to use nxhtml-mumamo-mode for .html files.  But I am not loving it.   When I am editing the Javascript portion of the code the tab indents do not behave as they do when editing C/C++ code.  It starts putting tabs within the line and if you try and hit tab in the white space preceding a line it inserts the tab rather than re-tabifying the line.

Another aspect that I don&#39;t like is that it doesn&#39;t do syntax colouring like the usual C/C++ modes do.  I much prefer the behaviour of the default java-mode when editing HTML files but that doesn&#39;t play nicely with the HTML code. :-(

1) Is there a better mode for editing HTML files with Javascript portions?

2) Is there a way to get nxhtml to use the default java-mode for the javascript portions?

Regards,

M


How do I configure emacs for editing HTML files that contain Javascript?

Suppose I have variables `dir` and `file` containing strings representing a directory and a filename, respectively . What is the proper way in emacs lisp to join them into a full path to the file?

For example, if `dir` is `&quot;/usr/bin&quot;` and `file` is `&quot;ls&quot;`, then I want `&quot;/usr/bin/ls&quot;`. But if instead `dir` is `&quot;/usr/bin/&quot;`, I still want the same thing, with no repeated slash.

What is the correct way to join multiple path components into a single complete path in emacs lisp?

How can I convert a symbol type into a string in Emacs lisp? 

I wasn&#39;t able to find a `symbol-to-string` function or anything similar.

Convert Symbol to a String in Elisp

I often want to unsplit window as follows:

    +--------------+-------------+			   +--------------+-------------+
    |              |             |			   |              |   	       	|
    |              |             |			   |              |   	       	|
    |              |             |			   |              |   	       	|
    +--------------+             |     --&gt;	   |              |   	       	|
    |              |             |			   |              |   	       	|
    |              |             |			   |              |            	|
    |              |             |			   |              |             |
    +--------------+-------------+			   +--------------+-------------+



    +--------------+--------------+			   +-----------------------------+
    |              |              |			   |                             |
    |              |              |			   |                             |
    |              |              |			   |                             |
    +--------------+--------------+    --&gt; 	   +-----------------------------+
    |                             |			   |                             |
    |                             |			   |                             |
    |                             |			   |                             |
    +-----------------------------+			   +-----------------------------+

Currently, I start with &lt;kbd&gt;ctrl&lt;/kbd&gt;-&lt;kbd&gt;x&lt;/kbd&gt; &lt;kbd&gt;1&lt;/kbd&gt; and then split vertically/horizontally. but my real qustion is how can one remove a particular window split with out disturbing the other window structure? Is there any elisp function in built?

emacs, unsplit a particular window split

What are some REPLs for Emacs Lisp?

Is there only one that is within Emacs?

Are there some that run inside terminal outside Emacs?


Content Type	Original Author	Original Content on Stackoverflow
Question	prosseek	View Question on Stackoverflow
Solution 1 - Emacs	offby1	View Answer on Stackoverflow
Solution 2 - Emacs	Jürgen Hötzel	View Answer on Stackoverflow
Solution 3 - Emacs	OTZ	View Answer on Stackoverflow

Concatenate strings in elisp

Emacs Problem Overview

EDIT

Emacs Solutions

Solution 1 - Emacs

Solution 2 - Emacs

Solution 3 - Emacs

How can I test with junit that a warning was logged with log4j?

Azure Storage Blob Rename

Attributions