Region selection the region is essentially what is call selection in some other applications it is the text that you have selected, or, in emacs jargon, the text that you have marked the cursor not the mouse pointer defines the position of point, which is one end of the region. If you want something a little more flexible, ive written my own function it toggles commenting on the current line if theres no region, and if there is a region, it just calls toggles commenting on that region. How to comment out an entire block of text in emacs quora. A collection of ridiculously useful extensions for emacs bbatsovcrux. Emacs support is not included in the refdb sources, but available separately as an autotoolsbased package including a manual, allowing a. The main command for commenting or uncommenting each of the lines in a region is commentregion. The current settings for commentstyle always prefix the comment lines with if not the whole. To specify the text for such a command to operate on, you set the mark at one end of it, and move point to the other end. When the commentedit command is invoked, a buffer is popped up and the user edits the command as ordinary text in that buffer. Gnu emacs for windows can be downloaded from a nearby gnu mirror. This project will focus on providing unmodified, uptodate from git master and newest release, and optimized w64 binary builds. Im using standard gnu emacs, not familiar with spacemacs. Otherwise, if there is an active region, these commands use the region as. An image on your file system that you can drag to emacs.
Markdown mode is available below, and is generated from comments in the source code. First, download the latest stable version and save the file where emacs can. Unzip the zip file preserving the directory structure, and run bin\runemacs. I dont know offhand of a way to uncomment the current line without setting the region. You can set either the local value or the default value. Also, these commands have a word and region variants. For example, you can press key,99j or 99,ci to comment out 99 lines. To uncomment a commentedout region, add a numeric argument. If you dont have emacs 21, i suppose you could simply download newcomment. If the region is active and transientmarkmode is on, call commentregion unless it only consists of comments, in which case it calls uncommentregion. I dont know which version of emacs youre using, but there is will be cx c. Alternatively, you may choose to receive this work under any other license that grants the right to use, copy, modify, andor distribute the work, as long as that license imposes the restriction that derivative works have to grant the same rights and impose the same restriction.
You can narrow the buffer to the region you are interested in and then use iedit to highlight change all the visible matches. Because comments are such an important part of programming, emacs provides special commands for editing and inserting comments. When she is finished editing, cccc pops down the edit buffer and inserts the text with proper comment syntax into the. In particular i will highlight the use of emacs as a research notebook. So, in emacs lisp code, where the comment string is comment region adds a single cu n mx comment region, where n is an integer, adds or removes n for example. Else, if the current line is empty, call commentinsertcommentfunction if it is defined, otherwise insert a comment and indent it. Emacs highlights the region whenever there is one, if you enable transient mark mode. Cc md, duplicate and comment the current line or region. You can configure c mode such that when you type a at the start of a line in a multiline block comment, this closes the comment. A nerd commenter emulation, help you comment code efficiently. In each case, emacs places point after the comments starting delimiter, so that you can start typing the comment text right away. How to get emacs to automatically insert block comment. That way, they wont be evaluated when you start emacs.
I make use of the ivy package note you can use mo in an ivy window to use multiactions otherwise the default action o will apply and the only other requirement is reddio, which is a set of sh scripts to interface with the reddit api. Note that to call emacs a text editor is a bit of an understatement. The main command for commenting or uncommenting each of the lines in a region is comment region. At its core is an interpreter for emacs lisp, a dialect of the lisp programming language with extensions to support text editing. I dont know if it works asis in earlier versions of emacs, but it might be worth a shot, though upgrading emacs would be a better solution. System requirement only 64bit mswindows are supported. I recommend using it with evil though evil is optional. If a line already contains the commentstart string, m. With this approach you want to mark the relevant region first and call narrowtoregion cx n n. With prefix argument, this command adds that many comment strings. To comment a region, use commentregion which is bound to cc cc in most modes, but not python by default, for some reason. Alternatively, create a desktop shortcut to bin\runemacs. It can also do spell checking on comments with flyspell prog mode see spelling.
If you want to test the latest versions, follow the links provided below to access the current subversion. Help says it is bound to comment region defined in newcomment. Text in the region can be indented or outdented as a group using cc to indent to the. If a line already contains the comment start string, m. Some major modes have special rules for indenting different kinds of comments. But this system allows me to browse, vote and comment on reddit posts all from within emacs. The text between point and the mark is called the region. Help says it is bound to commentregion defined in newcomment. If the selected region is not commented out, it will be commented if the selected region is already commented out, it will be uncommented. Typing an asterisk in multiline comment region, at the start of a line, will trigger indent. This work is licensed to you under version 2 of the gnu general public license. Ide interface for emacs code browsing, compilation, debug. If emacs works fine with your configuration, check your. This extension facilitates moving images from point a to point b point a the source can be an image inside your browser that you can drag to emacs.
Gnu emacs is an extensible, customizable text editorand more. If you want to give this a try, remove or comment out helmmode 1 from your. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Heres a command that combines lettercase commands into one. You can comment out regions by selecting them and using mx commentregion. As mentioned in comment commands, when the mj command adds a comment to a line, it tries to place the comment between the columns specified by the bufferlocal variables commentcolumn and commentfillcolumn or if that is nil, then the value of fillcolumn, see fill commands. This tutorial is intended to introduce the text editor emacs and demonstrate some of the advanced techniques that are useful for researchers. This fixes incorrect uncommenting of code regions that contain comment lines. If you are typing a comment and wish to continue it to another line, type mj or cmj commentindent. Mx commentregion add or remove comment delimiters on all the lines in the region. It would be nice if emacs automatically choose the right command depending whether there is text selection.
Furthermore, if the configurable variable scalaindent. Code gets rewritten when refactoring to accomidate for new features or when fixing bugs. Im wondering what is the key to toggle line comment in python, because m. A major mode for gnu emacs for editing markdownformatted text files. Many emacs commands operate on an arbitrary contiguous part of the current buffer. So, in emacs lisp code, where the comment string is commentregion adds a single cu n mx commentregion, where n is an integer, adds or removes n for example. I hack python so i went and looked it up and in pythonmode it executes the region.
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