Setting up a cron job on Mac

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In this example, we’re setting up a job, which will run at 08:00 am daily and clean rails logs

Step 1 – create a file with what we want to run (delete_logs.sh):

#!/bin/(shell) 

cd ~/code/rails_project
/Users/username/.rbenv/shims/bundle exec rake log:clear

Setp 2 – set up the cron scheduler:

$ env EDITOR=vim crontab -e

# Add the line to run the script at 8am daily:

0 8 * * * sh ~/scripts/delete_logs.sh >/tmp/stdout.log 2>/tmp/stderr.log
Categories: Uncategorized

Phoenix and Ecto. First Steps

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Valid as of Phoenix 1.2

Show routes:
mix phoenix.routes

Generating resources:
mix phoenix.gen.html Post posts –no-model
mix phoenix.gen.json Post posts

Ecto
Types

  • :string
  • :integer
  • :map
  • :binary_id
  • :float
  • :boolean

Writing Queries
Two ways

  1. Query
    import Ecto.Query
    
    from p in context.Posts
    where p.Title.Contains("Stuff")
    select p;
    
  2. Expression
    MyApp.Post
    |> where(titlle: "Stuff")
    |> limit(1)
    

Making changes – https://hexdocs.pm/ecto/Ecto.Changeset.html
changeset = Post.changeset(post, %{title: “updated”})
Repo.update(changeset)
Repo.delete(post)

Migrations
Generate migration:
mix ecto.gen.migration [migration_name] -r [repo]

Generate schema:
mix phoenix.gen.model [Schema] [table] [fields] -r [repo]

Run/Rollback migration
mix ecto.migrate -r [repo]
mix ecto.rollback -r [repo]

Generate migration:
Does not generate schema module:
mix ecto.gen.migration [migration_name] -r [repo]

Generates both schema model and a migration:
mix phoenix.gen.model [Schema] [table] [fields] -r [repo]

To avoid specifying repo all the time:
config :my_app, ecto_repos: [MyApp.Repo]

Categories: Elixir, Phoenix, Uncategorized

Setting up Elixir with Atom on Linux

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Sublime is a pretty nice editor for working with Elixir, but I just can’t get the autocomplete plugin to work. So, giving Atom a try.

Install the following packages:

atom-elixir – https://atom.io/packages/atom-elixir
language-elixir – https://atom.io/packages/language-elixir
linter (apm install linter) – https://atom.io/packages/linter
linter-elixirc – https://atom.io/packages/linter-elixirc
script – https://atom.io/packages/script

I use script to build within Atom (shift-ctrl-b). The only issue is that it seems to use the top-level folder of your project as a base path. So, if you try to do something like Code.load_file(“file.exs”) in one of your nested directories, it’ll try to load it from the top level directory.

Addendum for Mac
brew install elixir
brew install erlang

Set elixir path for autocomplete-elixir (if using Atom):
/usr/local/bin/elixir

Categories: Uncategorized

Parsing jQuery Unobtrusive Validation Parameters

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Client-side parsing of unubtrusive jQuery validation parameters. Assuming we are setting up an unobtrusive validator named “validatorname” and want to pass “parameterfromserver” from the the server:

$.validator.unobtrusive.adapters.add('validatorname', ['parameterfromserver'], function(options) {
	options.rules['validatorname'] = {
		parameterfromserver: options.params['parameterfromserver']
	};
	options.messages['validatorname'] = options.message;
});
$.validator.addMethod('validatorname', function(value, element, parameters) {
	var hereIsOurParameter = parameters.parameterfromserver;
});
Categories: Uncategorized

One Hand Typing

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If you have to type with one hand, AutoHotkey is a free option to turn your regular keyboard into a half mirror keyboard, where each key on one side is mirrored to the other (activate it by pressing Space key first).

Here’s a script, copied from AutoHotkey forum with slight modifications:

#SingleInstance, force
; Half-QWERTY: One-handed Typing - version 3a
; http://www.autohotkey.com/forum/viewtopic.php?p=228783#228783
;
; HalfKeyboard invented by Matias Corporation between 1992 and 1996
; Originally coded in AutoHotkey by jonny in 2004
; Many thanks to Chris for helping him out with this script.
; Capslock hacks and `~ remap to '" by Watcher
; This implementation was done by mbirth in 2007
;
; version 3a script, mod by hugov:
; 2008-10-31:
; - mixed with "Capitalize letters after 1 second hold" at request of Calibran
; http://www.autohotkey.com/forum/post-228311.html#228311
; just tested very briefly so try at your own peril :-)
;

KeyIsDown = 0
UpperDelay = 300
UpperDelay *= -1

RegRead KLang, HKEY_CURRENT_USER, Keyboard Layout\Preload, 1
StringRight KLang, KLang, 4
If (!KLang)
KLang := A_Language

If (KLang = "0407") {
; 0407 DE_de QWERTZ mirror set
original := "^12345qwertasdfgyxcvb"
mirrored := "ß09876poiuzölkjh-.,mn"
} Else If (KLang = "040c" || KLang = "040C") {
; 040c FR_fr AZERTY mirror set
original := "²&é" . """" . "'(azertqsdfgwxcvb" ; split up string for better
mirrored := ")àç" . "_" . "è-poiuymlkjh!:;,n" ; human readability
} Else {
; 0409 US_us QWERTY mirror set
original := "``" . "12345qwertasdfgzxcvb" ; split up string for better
mirrored := "'" . "09876poiuy;lkjh/.,mn" ; human readability
}

; Now define all hotkeys
Loop % StrLen(original)
{
c1 := SubStr(original, A_Index, 1)
c2 := SubStr(mirrored, A_Index, 1)
Hotkey Space & %c1%, DoHotkey
Hotkey Space & %c2%, DoHotkey
Hotkey %c1%, KeyDown
Hotkey %c1% UP, KeyUP
Hotkey %c2%, KeyDown ;
Hotkey %c2% UP, KeyUP ;
}

return

; This key may help, as the space-on-up may get annoying, especially if you type fast.
Control & Space::Suspend

; Not exactly mirror but as close as we can get, Capslock enter, Tab backspace.
Space & CapsLock::Send {Enter}
Space & Tab::Send {Backspace}

; If spacebar didn't modify anything, send a real space keystroke upon release.
+Space::Send {Space}
Space::Send {Space}

; General purpose
DoHotkey:
StartTime := A_TickCount
StringRight ThisKey, A_ThisHotkey, 1
i1 := InStr(original, ThisKey)
i2 := InStr(mirrored, ThisKey)
If (i1+i2 = 0) {
MirrorKey := ThisKey
} Else If (i1 > 0) {
MirrorKey := SubStr(mirrored, i1, 1)
} Else {
MirrorKey := SubStr(original, i2, 1)
}

Modifiers := ""
If (GetKeyState("LWin") || GetKeyState("RWin")) {
Modifiers .= "#"
}
If (GetKeyState("Control")) {
Modifiers .= "^"
}
If (GetKeyState("Alt")) {
Modifiers .= "!"
}
If (GetKeyState("Shift") + GetKeyState("CapsLock", "T") = 1) {
; only add if Shift is held OR CapsLock is on (XOR) (both held down would result in value of 2)
Modifiers .= "+"
}

If (KeyIsDown < 1 or ThisKey <> LastKey)
{
KeyIsDown := True
LastKey := ThisKey
Send %Modifiers%{%MirrorKey%}
SetKeyDelay, 65535
SetTimer, ReplaceWithUpperMirror, %UpperDelay%
}

Return

MenuShowKeyboardLayout:
IfWinNotExist, HalfKeyboard - permanent keyboard layout
{
Gui, +Owner +Toolwindow +AlwaysOnTop
Gui, Add, picture, x0 y0 w310 h104, %A_ScriptDir%\halfkeyboard_help.png
Gui, Show, w310 h104 NA, HalfKeyboard - permanent keyboard layout
Menu, Tray, Check, &Show Keyboard layout
}
Else
{
Gosub, GuiClose
}
Return

GuiClose:
Menu, Tray, UnCheck, &Show Keyboard layout
Gui, Destroy
Return

MenuExit:
ExitApp
Return

KeyDown:
Key:=A_ThisHotkey
If (KeyIsDown < 1 or Key <> LastKey)
{
KeyIsDown := True
LastKey := Key
Send %Key%
SetKeyDelay, 65535
SetTimer, ReplaceWithUpper, %UpperDelay%
}
Return

KeyUp:
Key:=A_ThisHotkey
SetTimer, ReplaceWithUpper, Off
SetTimer, ReplaceWithUpperMirror, Off
KeyIsDown := False
Return

ReplaceWithUpper:
SetKeyDelay, -1
Send {Backspace}+%LastKey%
Return

ReplaceWithUpperMirror:
SetKeyDelay, -1
Send {Backspace}+%MirrorKey%
Return

Categories: Uncategorized

Exceptionless Self-Hosting Tips

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Exceptionless is an awesome open source real-time error, feature, and log reporting solution that can be self-hosted for free (they provide a very reasonable pricing plans as well). Here’re some tips on self-hosting in the Windows environment.

Use these detailed instructions to set it up. Instructions are quite good. However, there are some details not mentioned in the guide which you could find helpful for self-hosting.

Elastic Search

When setting up Elastic Search, it’s a good idea to change the default location of the data folder. It can help avoid an accidental loss of your data when updating to the next version of Elastic Search. The data path can be set in the elasticsearch.yml – “path.data” property.

Rename your cluster name – “cluster.name” property. This can help prevent someone from accidentally joining your cluster.

To directly query Elastic Search, you can install Sense chrome plugin and run queries inside Chrome.

Another useful ES GUI plugin: elasticsearch-gui
To install, run cmd from ES installation bin folder: [~/elasticsearch] $ bin/plugin –install jettro/elasticsearch-gui
To access it, go to http://yourServer:9200/_plugin/gui/index.html#/dashboard (assuming default ES port 9200)

If you want to set up backups for ES, first set the repo location in elasticsearch.yml
path.repo: [“backupLocation”]

From Chrome, Sense plugin, run the following query to create a repo for your backups:

PUT /_snapshot/exceptionless_backup
{
  "type": "fs",
   "settings": {
        "compress" : true,
        "location": "backupLocation"
    }
}

When you want to create a snapshot, run:

PUT /_snapshot/exceptionless_backup/yourShapshotName?wait_for_completion=true

To delete an old snapshot:

DELETE _snapshot/exceptionless_backup/yourShapshotName

Removing Old Data
Exceptionless provides a job which will automatically remove data over a given retention period. But if you self-host, the retention period is indefinite. If you prefer to have Exceptionless remove the old automatically, you can modify the retention period directly in the Elastic Search. Run the following ES query to set retention period to 45 days:

POST /organizations-v1/organization/YourOrganizationId/_update '{ "doc" : 
{
    "doc" : {        
 "_source": {
     "retention_days": 45
   }
    }
}

You can use Elasticsearch-gui plugin to figure out your organization Id.

Weirdness with IE 11.
For some reason IE 11 did not want to auto refresh itself. So, you could add these headers at IIS level:
Cache-Control:no-cache, no-store
Pragma:no-cache
This comes at the price of more hits to your server. But I couldn’t figure out the IE issue.

Redis
If you use Redis (recommended), this is how you specify the connection string:

<add name="RedisConnectionString" connectionString="serverName:6379" />

The important part is that there is no http in the server name

Categories: Uncategorized

Using Git with Tfs

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If you’ve been curious about Git but have to use TFS, there is a way to try Git locally while still using TFS on the server. This can give you a chance to learn about Git while still working with Tfs.

Installing
Install git (http://git-scm.com/) and git-tfs (http://git-tfs.com/). Ensure both are working properly on the command line by trying out the commands.
Setup username and email address in .gitconfig. On a Windows system, it should be in your C:\Users\{username}. See a sample .gitconfig below.

Cloning
quick-clone allows you to clone a TFS repository at a specific changeset (c12345 in the example below):
git tfs quick-clone http://tfs:8080/tfs/DefaultCollection “$/yourTfsBranch” -c12345 –workspace=C:/ws

Now, you can pull all of the history starting from c12345 above:
git tfs pull

Run the clean up command:
git gc
git tfs cleanup

You’re ready to use Git as your local source control.

When you have a new task, create a new branch:
git checkout -b yourNewBranchName
After you made your changes, add it to your local branch:
git add –patch

Before moving your code, you need to get the latest from TFS and merge it into your branch:
git checkout master
git tfs pull
git checkout yourNewBranchName
git rebase master

Or, you can replace all of the 4 commands above with:
git tfs pull -r

If you need to shelve your changes:
git tfs shelve ShelfsetName

To checkin your code to tfs:
git tfs checkintool

When you need to merge changes from TFS, run
git mergetool

After you are done merging, continue with git rebase
git rebase –continue

Visual Studio also provides options to manage your branches and checkin your code to your local branches without the need to use a command line. You would still use command line to move your code to TFS.

SourceTree is another excellent tool to manage your local Git.

Sample .gitconfig (using Visual Studio as a merge tool):

[user]
name = FirstName LastName
email = [email protected]
[core]
autocrlf = true
excludesfile = C:\\.gitignore
editor = ‘C:\\Program Files\\Sublime Text 3\\sublime_text.exe’ -w
fscache = true
preloadindex = true

tool = vs
[difftool]
prompt = false
[difftool “vs”]
cmd = \”C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\Common7\\IDE\\vsdiffmerge.exe\” \”$LOCAL\” \”$REMOTE\” //t
keepbackup = false
trustexitcode = true
[merge]
tool = vs
[mergetool]
prompt = false
[mergetool “vs”]
#cmd = ‘C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\Common7\\IDE\\vsdiffmerge.exe’ “$REMOTE” “$LOCAL” “$BASE” “$MERGED” //m
cmd = \”C:\\Program Files (x86)//Microsoft Visual Studio 12.0\\Common7\\IDE\\vsdiffmerge.exe\” \”$REMOTE\” \”$LOCAL\” \”$BASE\” \”$MERGED\” //m
keepbackup = true
trustexitcode = true

———————————

Sample .gitIgnore:
#ignore thumbnails created by windows
Thumbs.db
#Ignore files build by Visual Studio
*.obj
*.exe
*.pdb
*.user
*.aps
*.pch
*.vspscc
*_i.c
*_p.c
*.ncb
*.suo
*.tlb
*.tlh
*.bak
*.cache
*.ilk
*.log
*.dll
*.lib
*.sbr
**/bin
**/obj
*.psess
**/node_modules
.vs/

Categories: Uncategorized