Why didn't the .rb execute? - terminal

I'm quite new to coding and terminal. Does anybody know what the problem is below with my last command line? I'm still working on all other files from 01 to 04, and they execute normally but not the 05. I couldn't put any other new command lines after that either.
Thank you for checking on it for me. Any help is appreciated! :)
hienthu#Hiens-MacBook-Air Webdev % cd algorithmic_strategies_exercise
hienthu#Hiens-MacBook-Air algorithmic_strategies_exercise % ls
01_swapper.rb 04_peak_finder.rb
02_is_sorted.rb 05_compress_str.rb
03_bubble_sort.rb algorithmic_strategies_exercise.zip
hienthu#Hiens-MacBook-Air algorithmic_strategies_exercise % ruby 05_compress_str.rb

Related

shell cd command in Ruby

Im trying to execute shell commands using ruby, but i cant change directory to PATH with blank spaces.
variable = %x[cd #{ENV["HOME"]}/Virtual\\ VMs/]
This is not working.
Thank you
To be absolutely safe:
path = File.join [ENV["HOME"], 'Virtual VMs']
variable = %x[cd '#{path}']
Please note, that cd has empty output, so to make sure it works one probably wants to do smth like:
path = File.join [ENV["HOME"], 'Virtual VMs']
variable = %x[cd '#{path}' && ls -la]
#⇒ "total 32\ndrwxr-xr-x ....."
What is ist supposed to do? You try to chdir into a directory, but then don't do anything in it. Your variable will be empty in any case. Aside from the fact that it is pointless to do, you can not reliably execute a cd by itself in this way, because it is not an executable file. You can see this if you just execute %x[cd]. You will get an Errno::ENOENT exception.
Maybe you should first describe in a broader context, what you want to achieve with your code. Where would you like to change the working directory? Within the Ruby process - in which case you have to use Dir.chdir - or in the child process - in which case you have to execute some command after the cd.

IDL READFITS() syntax error

I'm trying to use the READFITS() function on IDL 8.3 on Mac 10.9.3
My input on the IDL promt:
readfits('image.fits',h, /EXTEN, /SILENT)
Result:
readfits('image.fits',h, /EXTEN, /SILENT)
^
% Syntax error.
*note: the '^' is below '/EXTEN'
Maybe it will help, so here is a link to the IDL help page on using READFITS() --> http://www.exelisvis.com/docs/readfits.html
I tried using the brackets like they show on that help page, but it still didn't work, so I'm stuck now. Didn't know if anyone here has experience reading .fits files in IDL.
ok, so it turns out the readfits procedure isn't included in IDL's original library, so I just had to download AstroLib (contains lots of useful astronomy procedures - including Readfits). The original syntax then worked.
I'm using IDL 8.2.2 on OS X 10.9.4.
Try keeping it simple first. Do these work?
readfits('image.fits')
readfits('image.fits', header)
Next try this:
readfits('image.fits', header, EXTEN_NO=0)
I suspect you really want extension number 0, not 1. See (e.g.) http://www.stsci.edu/documents/dhb/web/c02_datafiles.fm2.html.

How to set processing_root in rp5rc

I'm attempting to install ruby processing. I followed this tutorial:
https://github.com/jashkenas/ruby-processing/wiki/Getting-Started
After I rake ( before I install jruby ), all of the tests fail. I get the following result before every print out and not sure how to fix it.
WARNING: you need to set PROCESSING_ROOT in ~/.rp5rc
Following the tipp by Oscar here is an easy Copy & Paste solution for Mac Users:
echo PROCESSING_ROOT: "/Applications/Processing.app/Contents/Java" > ~/.rp5rc
The instructions on the wiki have been updated since you asked this question.
As is now suggested, you can use this gist to create your .rp5rc file. Create a new sketch in Processing using the contents of SetProcessingRoot.pde in the gist, and it will suggest the correct PROCESSING_ROOT value for your system and create the file. Note that you'll have to delete the default text ("enter your processing root here") and enter the suggested (or another) path.
Or, if you know the correct PROCESSING_ROOT path for your system, do the following:
echo PROCESSING_ROOT: \"correct_path\" > ~/.rp5rc

bash: wrong behavior in for... loop together with a test statement

I am trying to test if certain files, called up in a list of textfiles, are in a certain directory. Every once in a while (and I am quite certain I use the same statements every time) I get an error, complaining that the echo command cannot be found.
The textfiles I have in my directory /audio/playlists/ are named according to their date on which they are supposed to be used: 20130715.txt for example for today:
me#computer:/some/dir# ls /audio/playlists/
20130715.txt 20130802.txt 20130820.txt 20130907.txt 20130925.txt
20130716.txt 20130803.txt 20130821.txt 20130908.txt 20130926.txt
(...)
me#computer:/some/dir# cat /audio/playlists/20130715.txt
#A Comment line goes here
00:00:00 141-751.mp3
00:03:35 141-704.mp3
00:06:42 140-417.mp3
00:10:46 139-808.mp3
00:15:13 136-126.mp3
00:20:26 071-007.mp3
(...)
23:42:22 136-088.mp3
23:46:15 128-466.mp3
23:50:15 129-592.mp3
23:54:29 129-397.mp3
So much for the facts. The following statement, which lets me test if all files called upon in all of the textfiles in the given directory are actually a file in the directory /audio/mp3/, produces an error:
me#computer:/some/dir# for i in $(cat /audio/playlists/*.txt|cut -c 10-16|sort|uniq); do [ -f "/audio/mp3s/$i.mp3" ] || echo $i; done
 echo: command not found
me#computer:/some/dir#
I would guess bash wants to complain about the "A Comment"-line (actually " line ") not being a file, but why would that cause echo not to be found? Again, mostly this works, but every so often I get this error. Any help is greatly appreciated.
That space before echo isn't U+0020, it's U+00A0. And indeed, the command " echo" doesn't exist.

Vim slow with ruby syntax highlighting

I've been using vim over ssh to work for a week or two now and all has been going great. Today I decided to add in some syntax highlighting, autocomplete, and some other general plugins. Set up vundle and went to work.
My current .vimrc can be found at https://github.com/scottopell/dotfiles/blob/master/.vimrc
I have cloned my vimrc and vim files onto my local ubuntu desktop and vim runs exactly as expected, no slowness on any files that I can find. Same plugins and same vimrc and no slowness on ruby files.
update
I can reproduce this issue with the following .vimrc
syntax on
and an empty ~/.vim folder.
However, vim on this vps is very slow with ruby/haml files. Much moreso ruby files. When I open any ruby file, startup takes about 2 seconds (timed with --startuptime). With a comparable length haml file, its about .5 seconds. This slowness isn't just on startup either, moving around and editing the file are both painfully slow.
Haml/erb(they are basically the same)
268.818 000.005: before starting main loop
848.871 580.053: first screen update
Ruby
199.613 000.004: before starting main loop
2937.859 2738.246: first screen update
Without syntax highlighting on the same ruby file as above
149.047 000.004: before starting main loop
152.912 003.865: first screen update
I have tried using mosh(http://mosh.mit.edu) and it doesn't help. not really relevant anymore
As you can see in my .vimrc file, I have tried a few different solutions to this problem.
I have tried running with all plugins disabled (I moved them all from ~/vim/bundle/PLUGINNAME to ~/vim/bundle/disabled/PLUGINNAME, is this correct?), set ruby path, set foldlevel to manual, disabled my colorscheme, nothing helps. see edit3
I can post the full startupttime log for any file if that will help.
I have tested a few other languages(php, c, python, vimL) and none experience any slowdown.
EDIT: Just to clarify, I am running an ssh session with ssh user#server then once inside the server I am doing vim file.rb.
EDIT2: I just tried accessing the server directly and the slowness persists without ssh, I have updated to reflect that this isn't a problem with ssh.
EDIT3: I can reproduce the issue with a .vimrc file that contains the single line syntax on with an empty ~/.vim folder
EDIT4 I uninstalled my compiled version of vim and any versions that I may have installed through apt, manually removed all vim stuff from my system, and I can run vim with vim -u NONE /path/to/file.rb then do :syn on and the issue will be there. The file in question is a rails controller, but like I've said, I can recreate it to some degree with most any file, but rails controllers see to be the worst.
The solution to this problem turned out to be the regex engine that vim uses.
The speculation on #vim on freenode is that the ruby syntax files use something that is slower on the new regex engine.
Any version older than and including Vim 7.3.969 has the old regex engine.
Add in set re=1 to your vimrc to force the old regex engine on any version newer (and don't forget to reload the file you're currently editing with :e).
Thanks to Houl, Dolio and dmedvinsky from #vim for help figuring it out.
I haven't had a chance to try the absolute latest version, there was a commit last night that may help with this issue. I will update this if I get the chance to try the bleeding edge version again.
You should set this tw options in your vimrc:
set ttyfast
set lazyredraw
If this is not solving your problem try to start vim without your vimrc to be sure that none of your current settings are screwing it up.
vim -u NONE
Two things that will drastically help speed up Ruby syntax highlighting are disabling cursor line and relative number for Ruby (if you use those).
I have the following in my .vimrc:
" Ruby is an oddball in the family, use special spacing/rules
if v:version >= 703
" Note: Relative number is quite slow with Ruby, so is cursorline
autocmd FileType ruby setlocal ts=2 sts=2 sw=2 norelativenumber nocursorline
else
autocmd FileType ruby setlocal ts=2 sts=2 sw=2
endif
I'm using vim 7.4.52 and none of these solutions worked for me.
According to this github comment on the issue (https://github.com/vim/vim/issues/282#issuecomment-169837021), foldmethod=syntax is responsible for the slowness.
Adding this to my .vimrc finally fixed it!
augroup ft_rb
au!
" fix the SLOOOW syntax highlighting
au FileType ruby setlocal re=1 foldmethod=manual
augroup END
Try setting your ruby path explicitly in your vimrc:
let g:ruby_path="/usr/bin/ruby"
see UPDATE at the bottom.
this may be helpful as a workaround -
i am using vim version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jan 2 2014 19:40:46)
Included patches: 1-52
it is the stock version from
Linux Mint 17.1 Rebecca.
the php.vim syntax file is not version'd that i can see, but it sez last edit'd 28 aug 13.
it isn't a ruby project, but when editing a large php class file (
$ php -w test.inc | wc
2 2410 19220
) i note significant delays near the top of the class, but not above or below the class, and, notably, not toward the bottom of the class. as i attempt to insert new text near the bottom of the class, delay is minimal and seems to be proportional to the line number inside the class. "minimal" means almost instantly, "significant" means 1 to 1.5 seconds per character.
the file is approx 1800 lines with approx 500 lines of legit php and 1300 lines of comments and doc. the class begins at approx line 30 and ends at approx line 1700. it is conceded it's a bit large, but well documented :-\
if i insert
class dummy { }
in front of the original "class originalName {",
there is no delay anywhere in the file. this unsightly kluge permits vim/gvim to regain its responsiveness and could be considered a workaround. note no linefeed between the two, just
class dummy { } class originalName {
it can even be comment'd out:
/*class dummy {}*/class originalName {
additional info:
during this test, the plugins directory was moved.
with "set syntax=off", the problem completely disappears. this is NOT a fix.
setting the regular expression engine with
set regexpengine=1 (or any other number)
does not appreciably change the results.
based on these results, i would suspect the regular expression engine as well. my point is that diddling a bit with the syntax in ruby files may lead to a workaround.
UPDATE:
i have found that the issue is "caused" by setting php_folding to 1 (enabled). the vimrc i THOUGHT i was using was not, but at least some of the mystery is solved due to that mistake. a simple vimrc like this will induce the problem (for me, as least):
:syntax enable
:let php_folding = 1
this means my issue is totally unrelated to the ruby issue, but there may be a similar thing going on with the ruby.vim file. maybe not.
apologies for the deflection.
I tried most of these solutions but what ended up working for me the best was removing any plugins associated with airline.

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