option to get the current working directory - zsh

I'm using oh-my-zsh and wanted to write a small plugin which would executes command autoamtically when i switch directories. So for example I will have to some kind of mapping like
/Users/ed1t/Dropbox="echo Entering Dropbox Directory"
I could write a function cd() to do this but is that the efficient way of doing it?

I think you're looking for the chpwd hook function.
chpwd () {
echo "Changing directory from $OLDPWD to $PWD"
}

Related

cmder ~ alias for user home folder

Simple question :
I am using cmder and i would like to be able to define ~(or ~USERID) as my %USERPROFILE% environment variables. I edited %CMDERROOT%\config\aliases to add this line : ~=%USERPROFILE% it does work for ls command but not for cd for instance.
Is there a better way to have this unix-like user profile aliases ?
For those who would like an answer to that question, it have been addressed in the following github issue :
https://github.com/cmderdev/cmder/issues/41
Not a direct answer, but a decent work-around was mentioned in the discussion on that page:
clink, the vendor package that would handle this has a similar issue report marked as "wontfix" So, here's the workaround
I'm using an AutoHotKey script for that:
#IfWinActive ahk_class VirtualConsoleClass
::~::D:/nicolas
#IfWinActive
It replaces automatically ~ with D:/nicolas in ConEmu console (and only ConEmu console)
I have not tried it in a script executed from the command line, but it works from the command line directly, as nicolas suggests.
I don´t remember where I got it but add these lines to your profile:
function cuserprofile { Set-Location ~ }
Set-Alias ~ cuserprofile -Option AllScope
you just hit ~ (enter) and you'll send to your home directory.
PS. I'm using PowerShell in cmder, regards.

Debugging bitbake pkg_postinst_${PN}: Append to config-file installed by other recipe

I'm writing am openembedded/bitbake recipe for openembedded-classic. My recipe RDEPENDS on keyutils, and everything seems to work, except one thing:
I want to append a single line to the /etc/request-key.conf file installed by the keyutils package. So I added the following to my recipe:
pkg_postinst_${PN} () {
echo 'create ... more stuff ..' >> ${sysconfdir}/request-key.conf
}
However, the intended added line is missing in my resulting image.
My recipe inherits update-rc.d if that makes any difference.
My main question is: How do i debug this? Currently I am constructing an entire rootfs image, and then poke-around in that to see, if the changes show up. Surely there is a better way?
UPDATE:
Changed recipe to:
pkg_postinst_${PN} () {
echo 'create ... more stuff ...' >> ${D}${sysconfdir}/request-key.conf
}
But still no luck.
As far as I know, postinst runs at rootfs creation, and only at first boot if rootfs fails.
So there is a easy way to execute something only first boot. Just check for $D, like this:
pkg_postinst_stuff() {
#!/bin/sh -e
if [ x"$D" = "x" ]; then
# do something at first boot here
else
exit 1
fi
}
postinst scripts are ran at roots time, so ${sysconfdir} is /etc on your host. Use $D${sysconfdir} to write to the file inside the rootfs being generated.
OE-Classic is pretty ancient so you really should update to oe-core.
That said, Do postinst's run at first boot? I'm not sure. Also look in the recipes work directory in the temp directory and read the log and run files to see if there are any clues there.
One more thing. If foo RDEPENDS on bar that just means "when foo is installed, bar is also installed". I'm not sure it makes assertions about what is installed during the install phase, when your postinst is running.
If using $D doesn't fix the problem try editing your postinst to copy the existing file you're trying to edit somewhere else, so you can verify that it exists in the first place. Its possible that you're appending to a file that doesn't exist yet, and the the package that installs the file replaces it.

How to run Go(lang) code directly from terminal/command line?

I want to run simple go code directly from terminal/command line. For example:
go run "
package main
func main() {
println("hello")
}
"
hello
However golang allows code execution only from file. So maybe there are some ways how to emulate it? Like this:
go run file.go < echo "...."
But there should be no files after actions above.
In command-line, only a project like go-repl would compile/run a multi-line go source code without leaving any .go file behind.
An alternative: gore:
$ gore
Enter one or more lines and hit ctrl-D
func test() string {return "hello"}
println(test())
^D
---------------------------------
hello
(Other repl-like solution are listed in "Does Go provide REPL?")
Or you would need to develop a go wrapper which would internally create a source code and go run it, before deleting it.
Ubuntu has a gorun tool which works well for small scripts. It compiles scripts on the fly, caching the binaries in /tmp.
https://wiki.ubuntu.com/gorun
Although it's intended for scripting and not as a REPL, you could use it in various ways.
Although gorun has come from the Ubuntu community, it should work on any Linux distro because it uses vanilla Go source code via
$ go get launchpad.net/gorun

How to get path to the vim being executed in vimscript

For example, in directory /abc the command vim def/my.txt would edit file /abc/def/my.txt.
I want to get the path /abc in my vim plugin script, but I don't know which function can do it.
I have read related articles, like
(Please add http:// to following items if you want to access, I don't have enough reputation to post more than 2 links o(╯□╰)o ):
learnvimscriptthehardway.stevelosh.com/chapters/40.html
vim.wikia.com/wiki/Get_the_name_of_the_current_file
How to get path to the current vimscript being executed
But useless.
Thanks.
==============================
I noticed at http://vim.wikia.com/wiki/Get_the_name_of_the_current_file, it said:
:echo #% def/my.txt
I thought I found the hope.
Because I can get /abc by minus def/my.txt from full path.
But I tested above command in my vim environment, it didn't work. It just print my.txt.
I think you're looking for the :pwd command / getcwd() function.
When you edit def/my.txt from /abc, the latter is your current directory, and all files are addressed relative to it. (Unless you have something like :set autochdir.)
For dealing with file paths, the fnamemodify() function is also very helpful; e.g. to turn filespecs into absolute ones (:p argument), or to cut off head, tail, or file extension.

How to use a template in vim

This is really a newbie question - but basically, how do I enable a template for certain filetypes.
Basically, I just want the template to insert a header of sorts, that is with some functions that I find useful, and libraries loaded etc.
I interpret
:help template
the way that I should place this in my vimrc
au BufNewFile,BufRead ~/.vim/skeleton.R
Running a R script then shows that something could happen, but apparently does not:
--- Auto-Commands ---
This may be because a template consists of commands (and there are no such in skeleton.R) - and in this case I just want it to insert a text header (which skelton.R consist of).
Sorry if this question is mind boggeling stupid ;-/
The command that you've suggested is not going to work: what this will do is run no Vim command whenever you open ~/.vim/skeleton.R
A crude way of achieving what you want would be to use:
:au BufNewFile *.R r ~/.vim/skeleton.R
This will read (:r) your file whenever a new *.R file is created. You want to avoid having BufRead in the autocmd, or it will read the skeleton file into your working file every time you open the file!
There are many plugins that add a lot more control to this process. Being the author and therefore completely biased, I'd recommend this one, but there are plenty of others listed here.
Shameless plug:
They all work in a relatively similar way, but to explain my script:
You install the plugin as described on the linked page and then create some templates in ~/.vim/templates. These templates should have the same extension as the 'target' file, so if it's a template for .R files, call it something like skeleton.R. In your .vimrc, add something like this:
let g:file_template_default = {}
let g:file_template_default['R'] = 'skeleton'
Then create your new .R file (with a filename, so save it if it's new) and enter:
:LoadFileTemplate
You can also skip the .vimrc editing and just do:
:LoadFileTemplate skeleton
See the website for more details.
Assume that your skeletons are in your ~/.vim/templates/ directory, you can put this
snippet in your vimrc file.
augroup templates
au!
" read in templates files
autocmd BufNewFile *.* silent! execute '0r ~/.vim/templates/skeleton.'.expand("<afile>:e")
augroup END
Some explanation,
BufNewFile . = each time we edit a new file
silent! execute = execute silently, no error messages if failed
0r = read file and insert content at top (0) in the new file
expand(":e") = get extension of current filename
see also http://vim.wikia.com/wiki/Use_eval_to_create_dynamic_templates
*fixed missing dot in file path
Create a templates subdirectory in your ~/.vim folder
$ mkdir -p ~/.vim/templates
Create a new file in subdirectory called R.skeleton and put in the header and/or other stuff you want to automagically load upon creating a new ".R " file.
$ vim ~/.vim/templates/R.skeleton
Then, add the following to your ~/.vimrc file, which may have been suggested in a way by "guest"
autocmd BufNewFile * silent! 0r $HOME/.vim/templates/%:e.skeleton
Have a look at my github repository for some more details and other options.
It's just a trick I used to use .
It's cheap but If you ain't know nothing about vim and it's commands it's easy to handle.
make a directory like this :
~/.vim/templates/barney.cpp
and as you konw barney.cpp should be your template code .
then add a function like ForUncleBarney() to end of your .vimrc file located in ~/.vimrc
it should be like
function ForBarneyStinson()
:read ~/.vim/templates/barney.cpp
endfunction
then just use this command in vim
:call ForBarneyStinson()
then you see your template
as an example I already have two templates for .cpp files
:call ForBarney()
:call ACM()
sorry said too much,
Coding's awesome ! :)
Also take a look at https://github.com/aperezdc/vim-template.git.
I use it and have contributed some patches to it and would argue its relatively full featured.
What about using the snipmate plugin? See here
There exist many template-file expanders -- you'll also find there explanations on how to implement a rudimentary template-file expander.
For my part, I'm maintaining the fork of muTemplate. For a simple start, just drop a {ft}.template file into {rtp}/template/. If you want to use any (viml) variable or expression, just do. You can even put vim code (and now even functions) into the template-file if you wish. Several smart decisions are already implemented for C++ and vim files.

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