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Code Editor : jed010.html

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<h2 id="sec13" class="section">9&#X2003;Mini-Buffer</h2>
The Mini-Buffer consists of a single line located at the bottom of the
screen. Much of the dialog between the user and jed takes place in this
buffer. For example, when you search for a string, jed will prompt you
for the string in the Mini-Buffer.The Mini-Buffer also provides a direct link to the S-Lang interpreter. To
access the interpreter, press Ctrl-X Esc and the S-Lang&gt;
prompt will appear in the Mini-Buffer. Enter any valid S-Lang expression
for evaluation by the interpreter.It is possible to recall data previously entered into the Mini-Buffer by
using the up and down arrow keys. This makes it possible to use and edit
previous expressions in a convenient and efficient manner.
<h3 id="sec14" class="subsection">9.1&#X2003;Command Line Completion</h3>
The jed editor has several hundred built&#X2013;in functions as well as many
more written in the S-Lang extension language. Many of these functions
are bound to keys and many are not. It is simply unreasonable to require
the user to remember if a function is bound to a key or not and, if it is,
to remember the key to which it is bound. This is especially true of those
functions that are bound but rarely used. More often than not, one simply
forgets the exact name or spelling of a function and requires a little
help. For this reason, jed supports command line completion in the
mini-buffer. This function, called <code class="verb">emacs_escape_x</code>, is bound to the
key Esc X. This is one binding that must be remembered!As an example, suppose that you are editing several buffers and you wish
to insert the contents of one buffer into the current buffer. The
function that does this is called <code class="verb">insert_buffer</code> and has no default
key-binding. Pressing Esc X produces the prompt M-x. This
prompt, borrowed from the Emacs editor, simply means that Esc X
was pressed. Now type in and hit the space bar or the Tab
key. In this context (completion context) the space bar and the Tab
will expand the string in the Mini-Buffer up until it is no longer unique.
In this case, <code class="verb">insert_file</code> and <code class="verb">insert_buffer</code> are only the two
functions that start with in. Hence, in will expand to
<code class="verb">insert_</code> at which point it becomes necessary to enter more
information to uniquely specify the desired function. However, in a
completion context, the space bar also has a special property that enables
the user to cycle among the possible completions. For this example,
hitting the space bar twice consecutively will produce the string
<code class="verb">insert_file</code> and hitting it again produces the desired string
<code class="verb">insert_buffer</code>.The role of the space bar in completion is a point where Emacs and jed
differ. Emacs will pop up a buffer of possible completions but jed expects
the user to press the space bar to cycle among them. Both have there pros
and cons. Frequently, one sees messages on the Usenet newsgroup
<code class="verb">gnu.emacs.help</code> from Emacs users asking for the kind of completion
jed employs.
<h3 id="sec15" class="subsection">9.2&#X2003;File Names</h3>
jed takes every file name and &#X201C;expands it&#X201D; according to a set of rules
which vary according to the Operating System. For concreteness, consider
jed running under MS-DOS. Suppose the user reads a new file into the
editor via the <code class="verb">find_file</code> command which emacs binds to Ctrl-X
Ctrl-F. Then the following might be displayed in the mini-buffer:<pre class="verbatim"> Find File: C:\JED\SLANG\
</pre>Here jed is prompting for a file name in the directory <code class="verb">\JED\SLANG</code>
on disk C:. However, suppose the user wants to get the file
<code class="verb">C:\JED\SRC\VIDEO.C</code>. Then the following responses produce equivalent
filenames when jed expands them internally:
<pre class="verbatim"> Find File: C:\JED\src\video.c
 Find File: C:\JED\SLANG\..\src\video.c
 Find File: C:\JED\SLANG\../src/video.c
</pre>Note that the on MS-DOS systems, jed replaces the / with a <code class="verb">\</code>
and that case is not important. Now suppose you wish to get the file
VIDEO.C from disk A:. The following are also valid:<pre class="verbatim"> Find File: A:\video.c
 Find File: A:video.c
 Find File: C:\JED\SLANG\a:\video.c
</pre>In the last case, jed is smart enough to figure out what is really meant.
Although the above examples are for MS-DOS systems, the rules also apply to
Unix and VMS systems as well. The only change is the file name syntax.
For example, on VMS
<pre class="verbatim"> sys$manager:[misc]dev$user:[davis.jed]vms.c
 dev$user:[davis.jed]vms.c
</pre> become equivalent filenames upon expansion. For unix, the following are
equivalent:<pre class="verbatim"> /user1/users/davis/jed/unix.c
 /usr/local/src//user1/users/davis/jed/unix.c
 /usr/local/src/~/jed/unix.c
</pre>Note the last example: the tilde character <code class="verb">~</code> always expands into
the users <code class="verb">HOME</code> directory, in this case to <code class="verb">/user1/users/davis</code>.When jed writes a buffer out to a file, it usually prompts for a file name
in the minibuffer displaying the directory associated with the current
buffer. At this point a name can be appended to the directory string to
form a valid file name or the user may simply hit the RET key. If
the latter alternative is chosen, jed simply writes the buffer to the file
already associated with the buffer. Once the buffer is written to a file,
the buffer becomes attached to that file.
<h3 id="sec16" class="subsection">9.3&#X2003;Buffer Name and File Name Completion</h3>
When jed prompts for a file name or a buffer name, the space bar and
the Tab keys are special. Hitting the Tab key will complete
the name that is currently in the minibuffer up until it is no longer
unique. At that point, you can either enter more characters to complete
the name or hit the space bar to cycle among the possible completions.
The spacebar must be pressed at least twice to cycle among the
completions.On MSDOS and VMS, it is possible to use wildcard characters in the file
name for completion purposes. For example, entering *.c and hitting
the space bar will cycle among file names matching *.c.
Unfortunately, this feature is not available on unix systems.
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