A minor annoyance of running "rails console" inside Emacs

If you run "rails console" from within Emacs, you might have been annoyed by the output that contains control characters whenever you run a query. Like the one given below:

1.9.3-p125 :001 > BlogPost.all
^[[1m^[[36mBlogPost Load (0.2ms)^[[0m  ^[[1mSELECT "blog_posts".* FROM "blog_posts" ^[[0m
I could not find a satisfactory solution for this anywhere. So I came up with the following solution that works fine for me.


What this code does is to make use of "term" instead of "shell" to run the rails console. In term-mode you have better support for rendering these control chars. To make navigation and kill/yank easier, it switches to line-mode. The default mode is char-mode. You can switch between line-mode and char-mode using C-c C-j and C-c C-k respectively. Hope that helps.

Comments

Unknown said…
Hello, Thanks for your post. This is useful. I have one more question. When I have line numbers enabled in Emacs, the line output from rails console wraps funny, because you get one of 2 characters for a line wrapping to the next and then a new line. Is there a way to amend this script so it disables line numbers only for the terminal? I already have

(global-linum-mode)

Set in my config for all other files.

Thank you,

Isaac
12/05/2013 08:26:00 PM
Post a Comment

Popular posts from this blog

The mysterious ORA-03111 error

Recently one of the applications that I developed started throwing exceptions, that had the following message: SQL state [72000]; error code [1013]; ORA-03111: break received on communication channel When I googled around, I couldn't come across anything useful. Sadly enough most of the sites just showed the documentation for that error, without any explanation from anyone experiencing that issues. So here you go, with the best possible explanation that I could come up with. My application sets two things on the connection that is throwing this exception: It sets the fetchSize to be 2500 rows It sets the query timeout to be 10 seconds The database server and the application are separated over a long latency network (actually there is a NetEm box that emulates the long latency between these two boxes) which has a latency characteristic of 50+/-5 milliseconds. This is the whole setup. It is important to understand how the timeout is handled by the Oracle client (in my case JDBC clien...
Read more

Note on allocationSize parameter of @SequenceGenerator while using JPA

I ran into what I thought as an issue while I was using the sequence ID generation strategy in JPA. The JPA provider I am using is Hibernate. I think sharing my experience will save someone some time. To use a sequence (For e.g. Oracle sequence) to generate values and assign them to the ID field of your persistence object, you will following something like this: @Id @Column(name = "ITEM_ID") @GeneratedValue(strategy = GenerationType.SEQUENCE, generator="ItemIdSeqGenerator") @SequenceGenerator(name="ItemIdSeqGenerator", sequenceName="ITEM_ID_SEQ", allocationSize=1) private long itemId; This means the following things: The @Id annotation says that the field itemId is a primary key. The @Column annotation says that the corresponding column in the database is ITEM_ID. The @GeneratedValue says that the value that needs to be populated in the itemId should be generated, while that object is persisted. The strategy to generate the value is to...
Read more

xVM's vboxmanage.exe command

You can view and edit the configuration of your guest OSs using the vboxmanage command. To view the list of guest OSs you have, give the following command: C:\Program Files\Sun\xVM VirtualBox>VBoxManage.exe list vms VirtualBox Command Line Management Interface Version 2.2.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved. "MySolaris" {dc6dc85f-5583-4a1b-bf3e-969941a2cd91} "Ubuntu" {eb973bbf-d86e-4579-85eb-6ea2cd12bf95} "Debian" {3e784597-89d8-4f17-90cb-63e866c651a3} "openSUSE" {6862884e-60e1-4c65-8aab-b57ec38a3922} "Debian-Lenny" {4b561432-abac-4a27-a501-b42af956b96b} To view the specific guest, you can use the UUID of the guest. For e.g. C:\Program Files\Sun\xVM VirtualBox>VBoxManage.exe showvminfo eb973bbf-d86e-4579-85eb-6ea2cd12bf95 VirtualBox Command Line Management Interface Version 2.2.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved. Name: Ubuntu Guest OS: Ubuntu UUID: eb973bb...
Read more