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  • Better, simpler example of 'semantic conflict'?

    - by rhubbarb
    I like to distinguish three different types of conflict from a version control system (VCS): textual syntactic semantic A textual conflict is one that is detected by the merge or update process. This is flagged by the system. A commit of the result is not permitted by the VCS until the conflict is resolved. A syntactic conflict is not flagged by the VCS, but the result will not compile. Therefore this should also be picked up by even a slightly careful programmer. (A simple example might be a variable rename by Left and some added lines using that variable by Right. The merge will probably have an unresolved symbol. Alternatively, this might introduce a semantic conflict by variable hiding.) Finally, a semantic conflict is not flagged by the VCS, the result compiles, but the code may have problems running. In mild cases, incorrect results are produced. In severe cases, a crash could be introduced. Even these should be detected before commit by a very careful programmer, through either code review or unit testing. My example of a semantic conflict uses SVN (Subversion) and C++, but those choices are not really relevant to the essence of the question. The base code is: int i = 0; int odds = 0; while (i < 10) { if ((i & 1) != 0) { odds *= 10; odds += i; } // next ++ i; } assert (odds == 13579) The Left (L) and Right (R) changes are as follows. Left's 'optimisation' (changing the values the loop variable takes): int i = 1; // L int odds = 0; while (i < 10) { if ((i & 1) != 0) { odds *= 10; odds += i; } // next i += 2; // L } assert (odds == 13579) Right's 'optimisation' (changing how the loop variable is used): int i = 0; int odds = 0; while (i < 5) // R { odds *= 10; odds += 2 * i + 1; // R // next ++ i; } assert (odds == 13579) This is the result of a merge or update, and is not detected by SVN (which is correct behaviour for the VCS). int i = 1; // L int odds = 0; while (i < 5) // R { odds *= 10; odds += 2 * i + 1; // R // next i += 2; // L } assert (odds == 13579) The assert fails because odds is 37. So my question is as follows. Is there a simpler example than this? Is there a simple example where the compiled executable has a new crash? As a secondary question, are there cases of this that you have encountered in real code? Again, simple examples are especially welcome.

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  • How do I change the color settings in emacs23 running in a terminal emulator?

    - by Anonymous
    I use xterm and set its appearance in ~/.Xdefaults: XTerm*background: paleTurquoise XTerm*foreground: black I also use emacs, but set its appearance differently in ~/.emacs: (set-background-color "black") (set-foreground-color "yellow") I usually run emacs within the terminal emulator with emacs -nw, rather than creating a separate X window. For some reason, this doesn't work properly for emacs23; instead, emacs retains the pale turquoise background of my xterm window. Looking at what's new in emacs23, I noted that: ** When running in a new enough xterm (newer than version 242), Emacs asks xterm what the background color is and it sets up faces accordingly for a dark background if needed (the current default is to consider the background light). So it's a feature, not a bug? Anyway, is there some way that I can I tell emacs23 to ignore the xterm background settings when running in console mode, and use the settings in ~/.emacs instead? I'll also note that: It works fine in emacs23 running in a separate X window (without the -nw option). It worked fine in emacs22; and I'm not really sure whether I need to use emacs23... Running M-x set-background-color within emacs23 -nw has no effect. It's not just xterm: the same problem exists with $TERM=cygwin, for example.

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  • How do I change the color settings in emacs23 running in a terminal console?

    - by Anonymous
    I use xterm and set its appearance in ~/.Xdefaults: XTerm*background: paleTurquoise XTerm*foreground: black I also use emacs, but set its appearance differently in ~/.emacs: (set-background-color "black") (set-foreground-color "yellow") I usually run emacs within the terminal console with emacs -nw, rather than creating a separate X window. For some reason, this doesn't work properly for emacs23; instead, emacs retains the pale turquoise background of my xterm window. Looking at what's new in emacs23, I noted that: ** When running in a new enough xterm (newer than version 242), Emacs asks xterm what the background color is and it sets up faces accordingly for a dark background if needed (the current default is to consider the background light). So it's a feature, not a bug? Anyway, is there some way that I can I tell emacs23 to ignore the xterm background settings when running in console mode, and use the settings in ~/.emacs instead? I'll also note that: Running M-x set-background-color within emacs23 -nw has no effect. It works fine in emacs23 running in a separate X window (without the -nw option). It worked fine in emacs22; and I'm not really sure whether I need to use emacs23... It's not just xterm: the same problem exists with $TERM=cygwin, for example.

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  • Schema.org vs microformats

    - by Tordek
    They both server the same purpose: providing a vocabulary for semantic markup. Schema is recognized and standardized... but microformats are open. Schema exploits microdata, while microformats go on classes. (Of note: microdata means that an element must be of a single itemtype, while microformats allow several classes to apply to the same element. I can markup xFolk+hAtom with classes, but not with microdata.) Is this a black-and-white situation? Google says I can't use both "because it may confuse the parser". What's the consensus on these?

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  • In VisualStudio 2008, emacs mode - how can you enable "overwrite"?

    - by Abby Fichtner
    Using VisualStudio 2008, have emacs keyboard mapping scheme enabled. If I select text and try to paste over it, it INSERTS the new text, rather than replacing it. Also, if I select text and hit DELETE it deletes the first character AFTER the selected text (just as if I didn't have any text selected). Does anyone know how to fix this so that I get the standard windows behavior. That is: If I select text and try to paste over it, it replaces the selected text with what I pasted in. If I select text and hit the DELETE key, it actually deletes the text I have selected Thanks! Abby

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

    - by MakeDummy
    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't like is that it doesn'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'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

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  • Can I customize the indentation of ternary operators in emacs' cperl-mode?

    - by Ryan Thompson
    In emacs cperl-mode, ternary operators are not treated specially. If you break them over multiple lines, cperl-mode simply indents each line the same way it indents any continued statement, like this: $result = ($foo == $bar) ? 'result1' : ($foo == $baz) ? 'result2' : ($foo == $qux) ? 'result3' : ($foo == $quux) ? 'result4' : fail_result; This is not very readable. Is there some way that I can convince cperl-mode indent like this? $result = ($foo == $bar) ? 'result1' : ($foo == $baz) ? 'result2' : ($foo == $qux) ? 'result3' : ($foo == $quux) ? 'result4' : fail_result; By the way, code example from this question.

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  • Searching for simple variable names like 'c' or 'x' in Emacs.

    - by wpeters
    I often wish to search for variables that are simply called 'c' or 'count'. For example int c, count; Unfortunately when I use an incremental search for 'c' or 'count' I get a lot of unnecessary hits like the 'c' in 'choice', or the 'count' in 'wordcount' which do not interest me. I know Emacs can do i-searches with regular expressions but I don't know the correct regular expression needed to match just 'c' and 'count'. These words are often surrounded by any number of white spaces. Anyone know the regex I can use to narrow my search?

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  • Can i configure emacs to use gdb like a graphical debugger?

    - by Joey Carson
    I'm pretty sure that this how other IDE's do it, e.g. on windows eclipse uses the output of gdb from MinGW (the windows port of GNU toolchain) to map where execution is in the source code and what values variables hold, etc. I'm stuck using gdb via a script that prepares our application in a chroot and does some other bootstrap for debug purposes. Once the script starts moving, the output is all gdb. Is there any way that I can configure emacs so that it will use gdb's output and allow for a sort of graphical debugger, comparable to that of eclipse or ms visual studio?

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  • Will Emacs --batch run in cron will hang when require user input?

    - by J Spen
    I have a job in crontab that requires emacs --batch but if the file is currently open it requests (s, p, q) to (steal, quit, etc...) which is fine if this file is being edited to not run the script but I want to make sure it kills the cron running script so it's not sitting in the background taking up memory. I have the output set to go to a log file so I can see this happening but no way to tell whether the script was terminated even though asked for user input. Does cron terminate these scripts and how to check the PID to make sure?

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  • How to align C++ class member names in one column in emacs ?

    - by KotBerbelot
    I would like to align all C++ class member names ( do not confuse with member types ) in one column. Lets look at the example of what we have at entrance: class Foo { public: void method1( ); int method2( ); const Bar * method3( ) const; protected: float m_member; }; and this is what we would like to have at the end: class Foo { public: void method1( ); int method2( ); const Bar * method3( ) const; protected: float m_member; }; So the longest member type declaration defines the column to which class member names will be aligned. How can i perform such transformation in emacs ?

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  • Can I use the emacs keyboard macro counter as a command prefix?

    - by Sean M
    I'm working on a project in emacs where I'd like to use a keyboard macro that changes slightly with each iteration. When I saw the keyboard macro counter in the manual, that looked like exactly what I needed - but as far as I can tell, that inserts an incrementing number into the current buffer. I want to use an incrementing number as a prefix to another command. For example, instead of inserting 3 into the buffer on the third execution of the macro, I'd like to be able to execute C-u 3 M-x my-command, followed by C-u 4 M-x my-command on the next iteration. Is there way to create a keyboard macro that does this? My specific task is "zipping" two blocks of text in the same buffer together, but even if there's an alternative way to do that specific thing, it'd be good to know the answer to the general question.

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  • Convert doc/docx to semantic HTML

    - by sandstrom
    I would like to convert doc/docx documents to semantic HTML. Some wishes/requirements: Semantic HTML such that headers in the document are <h1>, <h2> etc., tables are <table> and so forth. Should preferably be possible to handle headings, lists, tables and images. Graphs and math formulas is a nice extra. • Doesn't have to be converted straight from doc/docx to html, could use an intermediary format, such as xml or docbook. • Should work programatically, and with large number of documents. The closest thing to a solution I've found so far is http://holloway.co.nz/docvert/index.html, but unfortunately there are many a few bugs, small user base and it can't handle a lot of documents. More of a proof of concept.

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  • Where do you hang your semantic information, html?

    - by bobobobo
    Well, I keep putting semantic information about what an element means for the page logically in the class attribute <li class="phone-number">555-5555</li> It seems to work for this dual purpose of hanging semantic information and a pointer to how to style it. I'm not sure if this is the best idea, I'm trying to see if others have other ways of doing it. I also started to use a hidden input: <li>555-5555 <input class="semantics" type="hidden" value="phone-number" /></li> inside an element, so with jQuery, I can retrieve additional information about the element using li.find( '.semantics' ).val() To get an element's semantics from JavaScript

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  • Emacs hide/show support for C++ triple-slash Doxygen markup?

    - by jsyjr
    I use Doxygen's triple-slash syntax to markup my C++ code. There are two important cases which arise: 1) block markup comments which are the sole element on the line and may or may not begin flush left; e.g. class foo /// A one sentence brief description of foo. The elaboration can /// continue on for many lines. { ... }; void foo::bar /// A one sentence brief description of bar. The elaboration can /// continue on for many lines. () const { ... } 2) trailing markup comments which always follow some number of C++ tokens earlier on the first line but may still spill over onto subsequent lines; e.g. class foo { int _var1; ///< A brief description of _var1. int _var2; ///< A brief description of _var2 ///< requiring additional lines. } void foo::bar ( int arg1 ///< A brief description of arg1. , int arg2 ///< A brief description of arg2 ///< requiring additional lines. ) const { ... } I wonder what hide/show support exists to deal with these conventions. The most important cases are the block markup comments. Ideally I would like to be able to eliminate these altogether, meaning that I would prefer not to waste a line simply to indicate presence of a folded block markup comment. Instead I would like a fringe marker, a la http://www.emacswiki.org/emacs/hideshowvis.el /john

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  • Does the Eclipse editor have an equivalent of emacs's "align-regex"?

    - by rjray
    I've been using Eclipse pretty regularly for several years now, but I admit to not having explored all the esoterica it has to offer, particularly in the areas of what formatting features the editors offer. The main thing I miss from (X)emacs is the "align-regex" command, which let me take several lines into a region and then format them so that some common pattern in all lines was aligned. The simplest example of this is a series of variable assignments: var str = new String('aString'); var index = 0; var longCamelCaseObjectName = new LongNameObject(); After doing align-regex on "=", that would become: var str = new String('aString'); var index = 0; var longCamelCaseObjectName = new LongNameObject(); Now, you may have your own thoughts on stylistic (ab)use of white space and alignment, etc., but that's just an example (I'm actually trying to align a different kind of mess entirely). Can anyone tell me off-hand if there's an easy key-combo-shortcut for this in Eclipse? Or even a moderately-tricky one?

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  • How do I provide arguments to an application launcher in kde?

    - by bobdobbs
    So I can create launchers in a quicklaunch thing on the kde desktop. The launchers are easy to create, and work most of the time. What I haven't figured out, is how to pass arguments to the applications that I want to launch. I want to launch the firefox profile manager and I also want to add a launcher for an emacsclient frame. For emacsclient, I've tried these: emacsclient -c "emacsclient -c" 'emacsclient -c' None of them work. When I click the launcher, the tiny emacs logo appears attached to the mouse pointer, and stays there for at least a couple of minutes, but no new frame opens. So, how can I actually open an emacsclient frame, or any other application with an argument from quicklaunch?

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  • emacsclient -eval "(insert \"something\")" is not working for me

    - by manu
    I recently upgraded to Ubuntu 10.04 which comes with Emacs 23. I need Jabref to push citations to Emacs. However, despite I installed the Jabref plugin to push citations through emacsclient, it's not working. I did my testing, and read some of the Emacs Lisp Intro. Some commands do work, for instance if I type (in the console): emacsclient --eval "(switch-to-buffer \"*sratch*\")" the emacs windows switches to that buffer. However if I issue an insert command: emacsclient --eval "(insert \"do you see me?\")" no text is inserted in the current buffer. Does Emacs 23 changed something about insert?

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  • About the fix for the interference between Company mode and Yasnippet

    - by janoChen
    Emacs wiki says: Company does interfere with Yasnippet’s native behaviour. Here’s a quick fix: http://gist.github.com/265010 The code is the following: (define-key company-active-map "\t" 'company-yasnippet-or-completion) (defun company-yasnippet-or-completion () (interactive) (if (yas/expansion-at-point) (progn (company-abort) (yas/expand)) (company-complete-common))) (defun yas/expansion-at-point () "Tested with v0.6.1. Extracted from `yas/expand-1'" (first (yas/current-key))) I placed that code in my .emacs and the following message appeared: Warning (initialization): An error occurred while loading `c:/Documents and Settings/Alex.AUTOINSTALL.001/Application Data/.emacs.elc': Symbol's value as variable is void: company-active-map To ensure normal operation, you should investigate and remove the cause of the error in your initialization file. Start Emacs with the `--debug-init' option to view a complete error backtrace. Do I have to place the fix code inside a YASnippet's .el file? or in my .emacs (which throws me an error)?

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  • get ubuntu terminal to send an escape sequence (control+shift+up)

    - by user62046
    This problem starts when I use emacs ( with -nw option). Let me first explain it. I tried to define hotkey (for emacs) as following (global-set-key [(control shift up)] 'other-window) but it doesn't work (no error, just doesn't work), neither does (global-set-key [(control shift down)] 'other-window) But (global-set-key [(control shift right)] 'other-window) and (global-set-key [(control shift left)] 'other-window) work! But because the last two key combinations are used by emacs (as default), I don't wanna change them for other functions. So how could I make control-shift-up and control-shift-down work? I have googled "(control shift up)", it seems that control-shift-up is used by other people, (but not very few results). In the Stack Overflow forum, Gille answered me as following: Ctrl+Shift+Up does send a signal to your computer, but your terminal emulator is apparently not transmitting any escape sequence for it. So your problem is in two parts. First you must get your terminal emulator to send an escape sequence, which depends on your terminal emulator, and is Super User material, or Unix.SE if you're using a unix system. Then you need to declare the escape sequence in Emacs, and my answer explains that part So I come here for this question: How do I get my terminal (I use ubuntu 10.04, and the built-in terminal) to send an escape sequence for Control+Shift+Up Control+Shift+down

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  • Semantic Grid System, Media Query issue

    - by Andy
    I'm using the Semantic Grid System to build a responsive site. However, something isn't quite right with the media queries that should obviously kick in once it hits a particular screen size. I'll reference what i mean with their example on the website : if I view this on my iPhone for example, given that it is supposed to adjust to a single column structure on a mobile device, it still throws out the web version of the page. That is true for both Safari and Chrome on my iPhone. However, if I use the RWD bookmarklet to check it's appearance at different resolutions it appears as expected for the mobile resolution. Also, ironically, if I resize the page in Safari on my desktop it also adjusts accordingly once I get down to the approriate screen size, but not in Firefox. The media query that it uses once it hits 720px is @media screen and (max-width: 720px) { #maincolumn, #sidebar { .column(12); margin-bottom: 1em; } } and I might be wide of the mark here but I think that must be the issue. But given that this is directly from the semantic.gs website I'm not inclined to question their own code. Any idea what the problem might be?

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  • Tools for modelling data and workflows using structured text files

    - by Alexey
    Consider a case when I want to try some idea of an application. But I want to avoid investing a lot of effort in coding UI/work flows/database schema etc before I see that it's going to be useful to me (as example of potential user). My idea is stay lightweight and put all the data in text files. So the components could be following: Domain objects are represented by text files or their fragments Domain objects are grouped by their type using directories Structure the files using some both human- and machine-friendly format, e.g. YAML Use some smart text editor (e.g. vim, emacs, rubymine) to edit and navigate those files Use color schemes and macros/custom commands of the text editor to effectively manipulate those files Use scripts (or a lightweight web framework like Sinatra) to try some business logic ideas on top of the data model The question is: Are there tools or toolkits that support or can be adopted to this approach? Also any ideas, links to articles/other knowledge sources are very welcome. And more specific question: What is the simplest way to index and update index of files with YAML files?

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  • Low-res emacs24 icon in application switcher 12.10

    - by MTS
    I recently upgraded to Quantal, and also switched up to emacs24 from 23. Everything is great, except for one thing: the icon in the Application Switcher for emacs24 is a horrible, low-resolution eyesore. Compare the two side-by-side: I've seen a couple of questions addressing issues like this, but they're not quite the same. This one says that it is happening with all icons, but that's clearly not the case here. And this one seems more relevant, but it is talking about Gnome, not Unity. In the comments to the one answer for the second question, it says to look at the icons in /usr/share/icons to see if they are low-resolution, and if so to replace them with better ones. There's a ton of emacs icons, in fact. They are in various subfolders of /usr/share/icons/hicolor and they are in sizes ranging from 16x16 to 128x128, and also there are scaleable .svg versions of the icons too. I noticed that there are no 192x192 or 256x256 versions. But it seems like that shouldn't matter, since emacs23 also didn't have icons in those sizes. Any help would be much appreciated!

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  • Featureful commercial text editors?

    - by wrp
    I'm willing to buy tools if they add genuine value over a FOSS equivalent. One thing I wouldn't mind having is an editor with the power of Emacs, but made more user-friendly. There seem to be several commercial editors out there, but I can't find much discussion of them online. Maybe it's because the kind of people who use commercial software don't have time to do much blogging. ;-) If you have used any, what was your evaluation? I'd especially like to hear how you would compare them to Emacs. I'm thinking of editors like VEDIT, Boxer, Crisp, UltraEdit, SlickEdit, etc. To get things started, I tried EditPad Pro because I needed something on a Win98SE box. I was attracted by its powerful support for regexps, but I didn't use it for long. One annoyance was that find-in-files was only available in a separate product you had to buy. The main problem, though, was stability. It sometimes hung and I lost a few files because it corrupted them while editing. After a couple weeks, I found that I was avoiding using it, so I just uninstalled. Edit: Ah...I need to remove some ambiguity. With reference to Emacs, "power" often means its potential for customization. This malleability comes from having an architecture in which most of the functionality is written in a scripting language that runs on a compiled core. Emacs (with elisp) is by far the most widely known such system among home users, but there have been other heavily used editors such as Freemacs (MINT), JED (S-Lang), XEDIT (Rexx), ADAM (TPU), and SlickEdit (Slick-C). In this case, by "power" I'm not referring to extensibility but to realized features. There are three main areas which I think a commercial text editor might be an improvement over Emacs: Stability The only apps I regularly use on Linux that give me flaky behavior are Emacs, Gedit, and Geany. On Windows, I like the look and features of Notepad++, but I find it extremely unstable, especially if I try to use the plugins. Whatever I happen to be doing, I'm using some text editor practically all day long. If I could switch to an editor that never gave me problems, it would definitely lower my stress level. Tools When I started using Emacs, I searched the manual cover to cover to gleam ideas for clever, useful things I could do with it. I'd like to see lots of useful features for editing code, based on detailed knowledge of what the system can do and the accumulated feedback of users. Polish The rule of threes goes that if you develop something for yourself, it's three times harder to make it usable in-house, and three times harder again to make it a viable product for sale. It's understandable, but free software development doesn't seem to benefit from much usability testing. BTW, texteditors.org is a fantastic resource for researching text editors.

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