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POEscaped strings in elisp
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  1. POEscaped strings in elisp
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    copied!<p>I am very new to Lisp - and Elisp especially - and I have a problem with string handling:</p> <p>I want to convert a Windows style path to a Unix style path - especially I need to convert a path I get from Visual Studio to a Cygwin path, as I want to be able to open a file from Visual Studio in Emacs (I hope to use emacsclient --eval for this):</p> <p>The Visual Studio path has the following format:</p> <pre><code>C:\Users\name\documents\visual studio 2010\projects\test </code></pre> <p>I want to change it into the appropriate Cygwin path which would be:</p> <pre><code>/cygdrive/c/Users/name/documents/visual studio 2010/projects/test </code></pre> <p>However trying the following in the scratch-buffer already fails:</p> <pre><code>(replace-regexp-in-string "\\" "\/" "C:\users\someone") (subst-char-in-string ?\ ?/ "C:\users\someone") &gt;&gt; Debugger entered--Lisp error: (error "Non-hex digit used for Unicode escape") </code></pre> <p>Is there any way to make Elisp <em>not</em> escape the backslashes in every string?</p> <p><strong>EDIT</strong>: </p> <p>Here is how I call emacs from Visual Studio via external tools:</p> <pre><code>emacsclient -d 127.0.0.1:0.0 --eval '(convert-win-to-cygwin-path $(ItemPath))' </code></pre> <p><em>$(ItemPath)</em> will be replaced with <code>C:\Users\asf</code> which I can not influence - so it will pass a String with single backslashes to emacs that I need to modify in emacs.</p> <p>Can I make emacs KNOW that it needs to make double backslashes out of the single backslashes?</p> <p><strong>EDIT 2: Solution</strong></p> <p>I changed the way I attempt to start emacs by actually calling a shell-script that will start emacs - this way I can make sure that emacs gets the right path:</p> <pre><code>#!/bin/bash export PATH="/usr/bin/:/bin/:$PATH" filename=$1 line=$2 column=$3 cyged_path=$(cygpath "$filename") echo "Cyged path: $cyged_path" emacsclient -d 127.0.0.1:0.0 -n +$line:$column "$cyged_path" </code></pre> <p>And I call it from Visual Studio with the following arguments in the external tools window:</p> <pre><code>Path: &lt;path_to_cygwin&gt;\bin\bash.exe Arguments: &lt;path_to_script&gt; $(ItemPath) $(CurLine) $(CurCol) </code></pre>
 

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