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Kurmis
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Joined: 04 Jun 2010
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PostPosted: Sun Mar 12, 2017 1:56 pm    Post subject: XFCE - File type define by extension Reply with quote

I often work with Octave/Matlab files, which have extension *.m
Thunar and PCmanFM detect *.m files as "Objective C"

As i open any *.m file with gedit/geany/... default syntax Hi-Lite is treated as "Objective C"
So, i have to manually specify that opened file is Octave or Matlab code.
BTW Octave and Matlab syntax Hi-Lites can slightly differ in some editors.

How i can fix this behavior, and system wide define that extensoin *.m means Octave (at least Matlab) ?
I prefer system wide solution, not user-specific.

In file /usr/share/mime/packages/freedesktop.org.xml two file types
Code:
  <mime-type type="text/x-matlab">
  <mime-type type="text/x-objcsrc">

are associated to extension *.m
Code:
    <glob pattern="*.m"/>


Tnx in advance @ all.
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krinn
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PostPosted: Sun Mar 12, 2017 2:34 pm    Post subject: Reply with quote

you can put a header stating the code type to use highlight
/* -*- Mode: Octave; tab-width: 6 -*- */
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Kurmis
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PostPosted: Mon Mar 13, 2017 7:17 pm    Post subject: Reply with quote

krinn wrote:
you can put a header stating the code type to use highlight
/* -*- Mode: Octave; tab-width: 6 -*- */

No, i can not.
If i try to execute octave file with this line, then i gotta error.
May be for syntax Hi-Lite it helps, but with this line whole file is unusable.
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cboldt
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PostPosted: Mon Mar 13, 2017 8:07 pm    Post subject: Reply with quote

Just poking around starting with `man mimetype` ...

Interesting that the file /usr/share/mime/globs also has "text/x-objcsrc:*.m"

The /usr/share/mime/globs file has this opening admonishment to the reader ...

Code:
# This file was automatically generated by the
# update-mime-database command. DO NOT EDIT!


That assignment exists in /usr/share/mime/packages/freedesktop.org.xml which means this collision is built in to the mime definitions.

On my system, a similar assignment exists in /usr/share/doc/imagemagick-6.9.7.4/html/www/source/mime.xml in the first place (found by `grep -r text/x-objsrc /usr/*), but I have no idea if (and "if", then "how") this assignment is propagated to /usr/share/mime/globs.

So, here is what I did ...
Open /usr/share/mime/packages/freedesktop.org.xml with an editor
Comment out the assignment of *.m to Objective-C source code. The "<!--" and "-->" strings delimit the commenting out

Code:
<!--
  <mime-type type="text/x-objcsrc">
    <comment>Objective-C source code</comment>
    <sub-class-of type="text/x-csrc"/>
    <magic priority="30">
      <match value="#import" type="string" offset="0"/>
    </magic>
    <glob pattern="*.m"/>
  </mime-type>
-->


Run `update-mime-database /usr/share/mime`

Check for success with `grep \*\.m$ /usr/share/mime/*`

Let us know if that works for you ...
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Kurmis
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PostPosted: Mon Mar 13, 2017 8:59 pm    Post subject: Reply with quote

cboldt wrote:
Let us know if that works for you ...

Yes, ir works.
Code:
cp /usr/share/mime/packages/freedesktop.org.xml /usr/share/mime/packages/freedesktop.org.xml.bak00
mcedit /usr/share/mime/packages/freedesktop.org.xml

I have Objective C glob pattern changed from *.m to *.mm
Code:
diff /usr/share/mime/packages/freedesktop.org.xml /usr/share/mime/packages/freedesktop.org.xml.bak00
30896c30896
<     <glob pattern="*.mm"/>
---
>     <glob pattern="*.m"/>

Afer
Code:
update-mime-database /usr/share/mime
i have closed Thunar and pcmanFM, and opened 'em again.
Both of 'em *.m files now show as -MATLAB script/function-.

BTW, Gedit now open .m files as Octave, not Matlab.
It is OK for me.
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cboldt
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PostPosted: Mon Mar 13, 2017 9:08 pm    Post subject: Reply with quote

Thanks for the report. Turns out there are quite a few collisions in the mimetype list, including 6 instances of *.ogg, , and at least 50 extensions that have more than one entry. Maybe there is a mechanism that accounts for this, depending on the app, and I have to assume there is. Out of those collision cases, I also don't know how many reflect disparate filetypes, like the situation you were dealing with.
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cboldt
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PostPosted: Mon Mar 13, 2017 9:36 pm    Post subject: Reply with quote

I don't use geany, but found this tidbit online ...

Quote:
You can override the list of file extensions that Geany uses to detect filetypes using the user filetype_extensions.conf file.


http://geany.org/manual/dev/#filetype-extensions

The mime system clearly envision "collisions" or duplicate use of extension, as denoting more than one filetype. Thunar likely has a way to deal with these exceptional cases too, considering that different users have different default preferences, and the fact that more than one application has adopted certain extensions.
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Hu
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Posts: 13493

PostPosted: Tue Mar 14, 2017 1:43 am    Post subject: Reply with quote

Kurmis wrote:
I have Objective C glob pattern changed from *.m to *.mm
By tradition, *.mm refers to Objective-C++. This should not matter for you if you never use either Objective-C or Objective-C++. If you do use Objective-C++, then your choice may cause similar confusion between Objective-C and Objective-C++.
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Kurmis
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PostPosted: Tue Mar 14, 2017 7:43 am    Post subject: Reply with quote

Quote:
By tradition, *.mm refers to Objective-C++. This should not matter for you if you never use either Objective-C or Objective-C++. If you do use Objective-C++, then your choice may cause similar confusion between Objective-C and Objective-C++.
I do not use Objective C.
If one day i will prefer Objective C over Octave, i will know how i can set 'em as default
system wide and for geany.

How it works for gedit i found here :
http://askubuntu.com/questions/44730/can-i-set-a-default-syntax-highlighting-in-gedit
Quote:
You can at least add file extensions in the html syntax coloring scheme by editing html.lang in /usr/share/gtksourceview-2.0/language-specs/ as a super user. So say you want to add HTML syntax highlighting to cfm files, you'd change this
<property name="globs">*.html;*.htm</property>
(default html.lang) into this
<property name="globs">*.html;*.htm;*.cfm</property>

Tnx for excelent explanation.
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