Lost in bits

How to enable touchpad taps in Ubuntu 17.10

2017-10-22T11:41:00.002-07:00

After installing a new version of Ubuntu 17.10 I've found that my touchpad doesn't work properly. It doesn't click when I tap.

It took for a while to figure out that a new version switched from "xorg-synaptics" to "libinput". And for some interesting reasons "libinput" doesn't have tap to click enabled by default. So long story is short, here is a recipe to enable it:

1. Add following option to touchpad section in "/usr/share/X11/xorg.conf.d/40-libinput.conf"
Option "Tapping" "true"
2. Reboot and enjoy your touchpad again.

Connect ATmega328 with HC-05 (ZS-040) Bluetooth module

2015-04-18T14:06:00.000-07:00

Parts list

ATMega328 (I use handy Arduino Nano);
HC-05 (ZS-040) Bluetooth module (EGBT-045MS);
1K Ohm and 2K Ohm resistors;

Schema

HC-05 or ZS-040 Bluetooth module is based on EGBT-045MS chip and has following pins on board:

STATE - HIGH when module is connected;
RXD - data input pin;
TXD - data output pin;
GND - ground pin;
VCC - power input pin;
EN - Unknown pin. It should be connected to pin 34 of EGBT-045MS Bluetooth module, but it seems it doesn't work in preferred way;

So I connected HC-05 (ZS-040) as schema shows:

HC-05 TXD - ATmega RXD/PD0 (no voltage divider);
HC-05 RXD - ATmega TXD/PD1 (through voltage divider 1K Ohm + 2K Ohm)
HC-05 GND - Ground
HC-05 VCC - +5V

The connection of HC-05 module is very easy. Only RXD pin requires a voltage shifting, the connection of all other pins are straightforward.

Important note: This schema assumes that HC-05 will utilize RXD/TXD pins of ATmega328, which are used for UART and uploading a firmware. It means you have to power off HC-05 module during uploading of firmware to ATmega328. It can distract during development, but it's better to use hardware UART for communication with HC-05 in regular use.

AT mode

Before we start to use HC-05 (ZS-040) in regular communication, we need to change several internal settings of module. It can be done by switching HC-05 module to AT mode. In order to enable AT mode, use following steps:

Power off HC-05 module.
Press and hold small button above EN pin.
Power on and keep pressing small button.
Small LED should start to blink slowly about once every 2 seconds.

When HC-05 is switched to AT mode it's possible to send following AT commands:

AT+NAME=BLUES\r\n - change the name of module. It helps to recognize it.
AT+PSWD=7515\r\n - change the default PIN for pairing. More security for you the final device.
AT+UART=38400,1,0\r\n - change the default UART settings (9600 Baud). More speed as needed (up to 115200 Baud).

By default HC-05 uses 38400, 1 stop bit, no parity bit for AT mode communication and it cannot be changed by user. So in order to send these commands to HC-05 module, you have to initialize ATmega328 UART with above settings. HC-05 responses with OK if command executed successfully or ERROR:(?) with error code inside braces. See link with full description of commands and errors.

Source code

Here is the source code of UART communication for ATmega328.


#include <stdlib.h>
#include <string.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/atomic.h>
#include <util/delay.h>

void uart_init(uint32_t baudrate, uint8_t double_speed) {
    uint16_t ubrr = 0;
    if (double_speed) {
        UCSR0A = _BV(U2X0);  //Enable 2x speed
        ubrr = (F_CPU / (8UL * baudrate)) - 1;
    } else {
        ubrr = (F_CPU / (16UL * baudrate)) - 1;
    }
    UBRR0H = ubrr >> 8;
    UBRR0L = ubrr;

    UCSR0C &= ~(_BV(UMSEL01) | _BV(UMSEL00)); // enable asynchronous USART
    UCSR0C &= ~(_BV(UPM01) | _BV(UPM00)); // disable parity mode
    UCSR0C &= ~_BV(USBS0); // set 1-bit stop
    UCSR0C &= ~_BV(UCSZ02); 
    UCSR0C |= _BV(UCSZ01) | _BV(UCSZ00); // set 8-bit data

    UCSR0B = _BV(RXEN0) | _BV(TXEN0);   // Enable RX and TX 
}


uint8_t uart_getchar() {
    loop_until_bit_is_set(UCSR0A, RXC0);
    return UDR0;
}

void uart_read_line(uint8_t *value, uint8_t size) {
    for (uint8_t i = 0; i < size; i++) {
        value[i] = uart_getchar();
        if (value[i] == '\r') {
            value[i] = '\0';
            break;
        }
    }
}

void uart_putchar(const uint8_t data) {
    loop_until_bit_is_set(UCSR0A, UDRE0);
    UDR0 = data;
}


void uart_print(const char *value) {
    while (*value != '\0') {
        uart_putchar(*value++);
    }
}


int main(void) 
{
    uart_init(38400, 1);
    sei();

    uart_print("AT+NAME=BLUES\r\n");
    _delay_ms(1000);

    uart_print("AT+PSWD=7515\r\n");
    _delay_ms(1000);

    uart_print("AT+UART=38400,1,0\r\n");
    _delay_ms(1000);


    char data[11];
    for (;;) {
        memset(data, 0, 11);
        uart_read_line(data, 10);
        uart_print(data)
    }
}

This code initializes HC-05 with described above settings when it switched to AT mode and makes echo output in the main loop. After first initialization, it's better to comment out or delete AT commands in source code.

How to upgrade Django 1.6 to Django 1.7

2015-03-28T21:19:00.000-07:00

Update django package:
```
pip install -U Django
```
Remove 'south' from INSTALLED_APPS.
Delete all your (numbered) migration files, but not the directory or init.py - make sure you remove the .pyc files too.
Run python manage.py makemigrations. Django should see the empty migration directories and make new initial migrations in the new format.
Run python manage.py migrate. Django will see that the tables for the initial migrations already exist and mark them as applied without running them. (Only matching table names are checked; not their full schema
it’s up to you to make sure the existing schema is up to date with your models!)
Uninstall south package:
```
pip uninstall south
```
Update requirements.txt file:
```
pip freeze > requirements.txt
```

Webfaction

I'm using a great Python hosting - Webfaction. So here is short notes how to upgrade existing deployed application to Django 1.7.

Create new application with Django 1.7
Copy project folder from old Django 1.6 application to new Django 1.7 application.
Modify httpd.conf accordingly with new folder structure.
Stop existing existing application with django 1.6.

Restart new django 1.7 application:

~/webapps/django_17/apache2/bin/restart

Remove django 1.6 from Websites-> yourdomain.com -> Contents.
Add new django 1.7 app to Websites-> yourdomain.com -> Contents.

Done. Check how it works.

PS: And don't forgot to update fabric deployment file accordingly.

How to set up and run unit tests in ClojureScript

2015-03-20T21:57:00.001-07:00

This tutorial covers initial setup of a development environment to run unit tests in ClojureScript project.

Install software

The installation process of required software depends from operation system on your computer. So please, refer to the documentation of your package manager or installer. I'm going to provide examples for Arch Linux, but I hope you will be easily tranlsate them to your operation system.

Leiningen

Leiningen is a build automation and dependency management tool for Clojure/ClojureScript projects. It can compile, build and test your Clojure and ClojureScript application. Leiningen automatically resolves library dependencies using Maven repositories.

The leiningen package is included in AUR repository in Arch Linux. So run yaourt leiningen and confirm installation of a package.

PhantomJS

PhantomJS is a scripted, headless WebKit-based browser used for automated interaction with web pages and Javascript. I'm going to setup development environment which will run unit tests inside PhantomJS. It's excellent tool for headless testing of web application.

In order to install phantomjs package in Arch Linux, run following command: sudo pacman -Syu phantomjs

Project structure

The Leiningen can generate initial skeleton of our application. Run following command: lein new cljs-unit-test. It creates following project structure:

.
└── cljs-unit-test
    ├── doc
    │   └── intro.md
    ├── LICENSE
    ├── project.clj
    ├── README.md
    ├── resources
    ├── src
    │   └── cljs_unit_test
    │       └── core.clj
    └── test
        └── cljs_unit_test
            └── core_test.clj

The current structure is Clojure-based only. And we change it to support all future cases to the following:

.
└── cljs-unit-test
    ├── doc
    │   └── intro.md
    ├── LICENSE
    ├── project.clj
    ├── README.md
    ├── resources
    │   └── private
    ├── src
    │   ├── clj
    │   │   └── cljs_unit_test
    │   └── cljs
    │       └── cljs_unit_test
    │           └── core.clj
    └── test
        └── cljs
            └── cljs_unit_test
                └── core_test.clj

As you see, we added separated folders src/clj, test/clj for Clojure and src/cljs, test/cljs for ClojureScript. Lets update project.clj file accordingly our project structure.


(defproject cljs-unit-test "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :source-paths ["src/clj" "src/cljs"]
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/clojurescript "0.0-3123"]])

We added :source-paths ["src/clj" "src/cljs"] key and [org.clojure/clojurescript "0.0-3123"] dependency to our project. Unfortunately, the leiningen cannot build ClojureScript by itself. So we need lein-cljsbuild.

lein-cljsbuild plugin

The lein-cljsbuild is a Leiningen plugin for automatically compilation of your ClojureScript code into Javascript. We need to modify our project.clj file to use lein-cljsbuild:


(defproject cljs-unit-test "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}

  :source-paths ["src/clj" "src/cljs"]

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/clojurescript "0.0-3123"]]

  :plugins [[lein-cljsbuild "1.0.5"]]

  :hooks [leiningen.cljsbuild]

  :cljsbuild {
     :builds {
              :dev
              {:source-paths ["src/cljs"]
               :compiler {
                          :output-to "resources/private/js/main.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              :test
              {:source-paths ["src/cljs" "test/cljs"]
               :compiler {
                          :output-to "resources/private/js/unit-test.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              }}
)

We enabled lein-cljsbuild plugin and set up :dev and :test builds to produce separated Javascript files, because we don't want to include into our development and production Javascript files our tests. Also we don't enable aggresive optimization for debug purpose. So we are ready to add some application specific code to our project.

Lets modify src/cljs/cljs_unit_test/core.cljs file to following:


(ns cljs-unit-test.core)

(defn sum-two-numbers
  "Returns sum of two numbers"
  [x y]
  (+ x y))

(defn set-html! [el content]
    (set! (.-innerHTML el) content))

(defn ^:export init []
    (let [element (.getElementById js/document "main")
          content (str "2 + 2 = " (sum-two-numbers 2 2))]
        (set-html! element content)
        ))

It calculates sum of two numbers and displays it inside html element. The construction ^:export prevents tagged function to be removed during aggresive optimization of Javascript code.

Lets create html file for our demo application - resources/private/main.html:

<!doctype html>
<html lang="en">
<head>
    <title>Main</title>
</head>
<body>
    <h1 id="main"></h1>
    <script src="js/main.js"></script>
    <script>cljs_unit_test.core.init();</script>
</body>
</html>

clojurescript.test package

OK. We are ready to test our "super complex" application logic. But clojure.test works only for Clojure and we need ClojureScript specific unit test framework. It's clojurescript.test package. Lets add one more package to our project.clj file:


(defproject cljs-unit-test "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}

  :source-paths ["src/clj" "src/cljs"]

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/clojurescript "0.0-3123"]
                 [com.cemerick/clojurescript.test "0.3.3"]]

  :plugins [[lein-cljsbuild "1.0.5"]
            [com.cemerick/clojurescript.test "0.3.3"]]

  :hooks [leiningen.cljsbuild]

  :cljsbuild {
     :builds {
              :dev
              {:source-paths ["src/cljs"]
               :compiler {
                          :output-to "resources/private/js/main.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              :test
              {:source-paths ["src/cljs" "test/cljs"]
               :compiler {
                          :output-to "resources/private/js/unit-test.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              }}
  )

We added [com.cemerick/clojurescript.test "0.3.3"] to our dependencies and plugins. Finally we can add our tests to test/cljs/cljs_unit_test/core_test.cljs:


(ns cljs-unit-test.core-test
    (:require-macros [cemerick.cljs.test
                      :refer (is deftest with-test run-tests testing test-var)])
    (:require [cemerick.cljs.test :as t]
              [cljs-unit-test.core :as core])
    )

(deftest test-sum-two-numbers
    (is (= (core/sum-two-numbers 2 2) 4))
    (is (= (core/sum-two-numbers 0 5) 5))
    )

Running unit tests

The last step is to configure our project to run unit tests inside PhantomJS. Modify project.clj file:


(defproject cljs-unit-test "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}

  :source-paths ["src/clj" "src/cljs"]

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/clojurescript "0.0-3123"]
                 [com.cemerick/clojurescript.test "0.3.3"]]

  :plugins [[lein-cljsbuild "1.0.5"]
            [com.cemerick/clojurescript.test "0.3.3"]]

  :hooks [leiningen.cljsbuild]

  :cljsbuild {
     :test-commands {"unit" ["phantomjs" :runner
                             "resources/private/js/unit-test.js"]}
     :builds {
              :dev
              {:source-paths ["src/cljs"]
               :compiler {
                          :output-to "resources/private/js/main.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              :test
              {:source-paths ["src/cljs" "test/cljs"]
               :compiler {
                          :output-to "resources/private/js/unit-test.js"
                          :optimizations :whitespace
                          :pretty-print true
                          }}
              }}
  )

We specified :test-commands to run phantomjs executable with "resources/private/js/unit-test.js" file as argument.

Well. Finally, we can run our unit tests: lein cljsbuild test

And you will see following result:

Compiling ClojureScript.
Running ClojureScript test: unit

Testing cljs-unit-test.core-test 

Ran 1  tests containing 2 assertions.
Testing complete: 0 failures, 0 errors.

Build an application by running: lein cljsbuild once

And open resources/private/main.html in your favourite browser to manually verify how demo application works.

Tips: In order to speed up a little bit development, run following command in separated console: lein cljsbuild auto. It automatically builds your project after saving of files.

The final source code is available in my GitHub repository.

Vimium - Hacker's browser

2015-03-05T19:18:00.001-08:00

Vimium is Google Chrome and Chromium extension, which brings Vim-like navigation to your browser. You can install it from Chrome Web Store or from a source code.

Once you have Vimium installed, you can see this list of key bindings at any time by typing ?.

Here the list of default keys:
h scroll left

j scroll down

k scroll up

l scroll right

gg scroll to top of the page

G scroll to bottom of the page

d scroll down half a page

u scroll up half a page

f open a link in the current tab

F open a link in a new tab

r reload

gs view source

yy copy the current url to the clipboard

o Open URL, bookmark, or history entry
/ enter find mode -- type your search query and hit enter to search or esc to cancel

n cycle forward to the next find match

N cycle backward to the previous find match
H go back in history

L go forward in history
J, gT go one tab left

K, gt go one tab right

t create tab

x close current tab

You may remap or unmap any of the default key bindings in the "Key mappings" section under "Advanced Options" on the options page.

See video with details:

Countries list in JSON format

2015-02-13T08:00:00.000-08:00

In my previous post I shared the list of US State, but in comments followers asked about the list of countries. So here is the list of 252 countries with ISO codes as abbreviation in JSON format:

{
"AD": "Andorra",
"AE": "United Arab Emirates",
"AF": "Afghanistan",
"AG": "Antigua and Barbuda",
"AI": "Anguilla",
"AL": "Albania",
"AM": "Armenia",
"AO": "Angola",
"AQ": "Antarctica",
"AR": "Argentina",
"AS": "American Samoa",
"AT": "Austria",
"AU": "Australia",
"AW": "Aruba",
"AX": "Aland Islands",
"AZ": "Azerbaijan",
"BA": "Bosnia and Herzegovina",
"BB": "Barbados",
"BD": "Bangladesh",
"BE": "Belgium",
"BF": "Burkina Faso",
"BG": "Bulgaria",
"BH": "Bahrain",
"BI": "Burundi",
"BJ": "Benin",
"BL": "Saint Barthelemy",
"BM": "Bermuda",
"BN": "Brunei",
"BO": "Bolivia",
"BQ": "Bonaire, Saint Eustatius and Saba ",
"BR": "Brazil",
"BS": "Bahamas",
"BT": "Bhutan",
"BV": "Bouvet Island",
"BW": "Botswana",
"BY": "Belarus",
"BZ": "Belize",
"CA": "Canada",
"CC": "Cocos Islands",
"CD": "Democratic Republic of the Congo",
"CF": "Central African Republic",
"CG": "Republic of the Congo",
"CH": "Switzerland",
"CI": "Ivory Coast",
"CK": "Cook Islands",
"CL": "Chile",
"CM": "Cameroon",
"CN": "China",
"CO": "Colombia",
"CR": "Costa Rica",
"CU": "Cuba",
"CV": "Cape Verde",
"CW": "Curacao",
"CX": "Christmas Island",
"CY": "Cyprus",
"CZ": "Czech Republic",
"DE": "Germany",
"DJ": "Djibouti",
"DK": "Denmark",
"DM": "Dominica",
"DO": "Dominican Republic",
"DZ": "Algeria",
"EC": "Ecuador",
"EE": "Estonia",
"EG": "Egypt",
"EH": "Western Sahara",
"ER": "Eritrea",
"ES": "Spain",
"ET": "Ethiopia",
"FI": "Finland",
"FJ": "Fiji",
"FK": "Falkland Islands",
"FM": "Micronesia",
"FO": "Faroe Islands",
"FR": "France",
"GA": "Gabon",
"GB": "United Kingdom",
"GD": "Grenada",
"GE": "Georgia",
"GF": "French Guiana",
"GG": "Guernsey",
"GH": "Ghana",
"GI": "Gibraltar",
"GL": "Greenland",
"GM": "Gambia",
"GN": "Guinea",
"GP": "Guadeloupe",
"GQ": "Equatorial Guinea",
"GR": "Greece",
"GS": "South Georgia and the South Sandwich Islands",
"GT": "Guatemala",
"GU": "Guam",
"GW": "Guinea-Bissau",
"GY": "Guyana",
"HK": "Hong Kong",
"HM": "Heard Island and McDonald Islands",
"HN": "Honduras",
"HR": "Croatia",
"HT": "Haiti",
"HU": "Hungary",
"ID": "Indonesia",
"IE": "Ireland",
"IL": "Israel",
"IM": "Isle of Man",
"IN": "India",
"IO": "British Indian Ocean Territory",
"IQ": "Iraq",
"IR": "Iran",
"IS": "Iceland",
"IT": "Italy",
"JE": "Jersey",
"JM": "Jamaica",
"JO": "Jordan",
"JP": "Japan",
"KE": "Kenya",
"KG": "Kyrgyzstan",
"KH": "Cambodia",
"KI": "Kiribati",
"KM": "Comoros",
"KN": "Saint Kitts and Nevis",
"KP": "North Korea",
"KR": "South Korea",
"XK": "Kosovo",
"KW": "Kuwait",
"KY": "Cayman Islands",
"KZ": "Kazakhstan",
"LA": "Laos",
"LB": "Lebanon",
"LC": "Saint Lucia",
"LI": "Liechtenstein",
"LK": "Sri Lanka",
"LR": "Liberia",
"LS": "Lesotho",
"LT": "Lithuania",
"LU": "Luxembourg",
"LV": "Latvia",
"LY": "Libya",
"MA": "Morocco",
"MC": "Monaco",
"MD": "Moldova",
"ME": "Montenegro",
"MF": "Saint Martin",
"MG": "Madagascar",
"MH": "Marshall Islands",
"MK": "Macedonia",
"ML": "Mali",
"MM": "Myanmar",
"MN": "Mongolia",
"MO": "Macao",
"MP": "Northern Mariana Islands",
"MQ": "Martinique",
"MR": "Mauritania",
"MS": "Montserrat",
"MT": "Malta",
"MU": "Mauritius",
"MV": "Maldives",
"MW": "Malawi",
"MX": "Mexico",
"MY": "Malaysia",
"MZ": "Mozambique",
"NA": "Namibia",
"NC": "New Caledonia",
"NE": "Niger",
"NF": "Norfolk Island",
"NG": "Nigeria",
"NI": "Nicaragua",
"NL": "Netherlands",
"NO": "Norway",
"NP": "Nepal",
"NR": "Nauru",
"NU": "Niue",
"NZ": "New Zealand",
"OM": "Oman",
"PA": "Panama",
"PE": "Peru",
"PF": "French Polynesia",
"PG": "Papua New Guinea",
"PH": "Philippines",
"PK": "Pakistan",
"PL": "Poland",
"PM": "Saint Pierre and Miquelon",
"PN": "Pitcairn",
"PR": "Puerto Rico",
"PS": "Palestinian Territory",
"PT": "Portugal",
"PW": "Palau",
"PY": "Paraguay",
"QA": "Qatar",
"RE": "Reunion",
"RO": "Romania",
"RS": "Serbia",
"RU": "Russia",
"RW": "Rwanda",
"SA": "Saudi Arabia",
"SB": "Solomon Islands",
"SC": "Seychelles",
"SD": "Sudan",
"SS": "South Sudan",
"SE": "Sweden",
"SG": "Singapore",
"SH": "Saint Helena",
"SI": "Slovenia",
"SJ": "Svalbard and Jan Mayen",
"SK": "Slovakia",
"SL": "Sierra Leone",
"SM": "San Marino",
"SN": "Senegal",
"SO": "Somalia",
"SR": "Suriname",
"ST": "Sao Tome and Principe",
"SV": "El Salvador",
"SX": "Sint Maarten",
"SY": "Syria",
"SZ": "Swaziland",
"TC": "Turks and Caicos Islands",
"TD": "Chad",
"TF": "French Southern Territories",
"TG": "Togo",
"TH": "Thailand",
"TJ": "Tajikistan",
"TK": "Tokelau",
"TL": "East Timor",
"TM": "Turkmenistan",
"TN": "Tunisia",
"TO": "Tonga",
"TR": "Turkey",
"TT": "Trinidad and Tobago",
"TV": "Tuvalu",
"TW": "Taiwan",
"TZ": "Tanzania",
"UA": "Ukraine",
"UG": "Uganda",
"UM": "United States Minor Outlying Islands",
"US": "United States",
"UY": "Uruguay",
"UZ": "Uzbekistan",
"VA": "Vatican",
"VC": "Saint Vincent and the Grenadines",
"VE": "Venezuela",
"VG": "British Virgin Islands",
"VI": "U.S. Virgin Islands",
"VN": "Vietnam",
"VU": "Vanuatu",
"WF": "Wallis and Futuna",
"WS": "Samoa",
"YE": "Yemen",
"YT": "Mayotte",
"ZA": "South Africa",
"ZM": "Zambia",
"ZW": "Zimbabwe",
"CS": "Serbia and Montenegro",
"AN": "Netherlands Antilles"
}

US States in JSON format

2015-02-09T22:04:00.000-08:00

I couldn't find a list of US State abbreviations and names that I could quickly use in Javascript. So I combined the list in JSON format for your convenient. You can use it as you wish.

{
    "AK": "Alaska",
    "AL": "Alabama",
    "AR": "Arkansas",
    "AZ": "Arizona",
    "CA": "California",
    "CO": "Colorado",
    "CT": "Connecticut",
    "DC": "District Of Columbia",
    "DE": "Delaware",
    "FL": "Florida",
    "GA": "Georgia",
    "HI": "Hawaii",
    "IA": "Iowa",
    "ID": "Idaho",
    "IL": "Illinois",
    "IN": "Indiana",
    "KS": "Kansas",
    "KY": "Kentucky",
    "LA": "Louisiana",
    "MA": "Massachusetts",
    "MD": "Maryland",
    "ME": "Maine",
    "MI": "Michigan",
    "MN": "Minnesota",
    "MO": "Missouri",
    "MS": "Mississippi",
    "MT": "Montana",
    "NC": "North Carolina",
    "ND": "North Dakota",
    "NE": "Nebraska",
    "NH": "New Hampshire",
    "NJ": "New Jersey",
    "NM": "New Mexico",
    "NV": "Nevada",
    "NY": "New York",
    "OH": "Ohio",
    "OK": "Oklahoma",
    "OR": "Oregon",
    "PA": "Pennsylvania",
    "RI": "Rhode Island",
    "SC": "South Carolina",
    "SD": "South Dakota",
    "TN": "Tennessee",
    "TX": "Texas",
    "UT": "Utah",
    "VA": "Virginia",
    "VT": "Vermont",
    "WA": "Washington",
    "WI": "Wisconsin",
    "WV": "West Virginia",
    "WY": "Wyoming"
}

Personal organizer with vimwiki

2015-02-09T00:08:00.000-08:00

Emacs users enjoy org-mode as super organizer of personal notes, documentation, diary, tasks list and many other things. And I wanted the same features for Vim and recently I found it. Welcome vimwiki as your personal organizer. Here is the list of features, what you can do with vimwiki plugin:

Organize notes in multiple wiki files.
Link your ideas/notes with quick wiki links.
Manage to-do lists.
Write documentation with rich formatting.
Use tables to organize data.
Memorize events in diary.
Generate HTML from wiki files.
Multiple wiki support.

Install

As usual, use following Git repository to install plugin with Pathogen:
https://github.com/vimwiki/vimwiki
Then you need to register wiki folders:

let g:vimwiki_list = [{'path': '$HOME/Documents/wiki'}]

In order to enjoy synchronization between all my devices, I shared this folder with BitTorrent Sync.
Also I put additional convenient settings into my ~/.vimrc:

let g:vimwiki_dir_link = 'index' - automatically resolve folder links as folder/index.wiki
let g:vimwiki_hl_headers = 1 - highlight headers with different colors
let g:vimwiki_hl_cb_checked = 1 - highlight completed tasks

Key bindings

<Leader>ww - Open default wiki index file.
<Leader>wt - Open default wiki index file in a new tab.
<Leader>ws - Select and open wiki index file.
<Leader>wd - Delete wiki file you are in.
<Leader>wr - Rename wiki file you are in.
<Enter> - Follow/Create wiki link
<Shift-Enter> - Split and follow/create wiki link
<Ctrl-Enter> - Vertical split and follow/create wiki link
<Backspace> - Go back to parent(previous) wiki link
<Tab> - Find next wiki link
<Shift-Tab> - Find previous wiki link

Organize notes

Any time when you need to open vimwiki you can just type <Leader>ww and vim opens index wiki file in the current buffer. See key binding to open vimwiki in a new tab or split window.
If you want to place a note to separated wiki file, then just type a name of wiki file (SomeWikiNote) or type a wiki link ([[Some wiki note]]) and hit <Enter> on it. Vimwiki automatically creates a new wiki file and opens it in the current buffer. Hit <Backspace> in order to return to previous wiki file.
Vimwiki supports all necessary markups for creating rich notes.
There are a few typefaces that gives you a bit of control over how your text should be decorated:

  *bold text*
  _italic text_
  ~~strikeout text~~
  `code (no syntax) text`
  super^script^
  sub,,script,,

Define logical sections with headers:

= Header level 1 =
== Header level 2 ==
=== Header level 3 ===
==== Header level 4 ====
===== Header level 5 =====
====== Header level 6 ======

Combine list of items with bulleted, numbered and mixed lists:

  * Bulleted list item 1
  * Bulleted list item 2
    * Bulleted list sub item 1
    * Bulleted list sub item 2
   
  # Numbered list item 1
  # Numbered list item 2
    # Numbered list sub item 1
    # Numbered list sub item 2

or definition list:

Term 1:: Definition 1
Term 2::
:: Definition 2
:: Definition 3

Collect table data with :VimwikiTable command:

 | Year | Temperature (low) | Temperature (high) |
 |------|-------------------|--------------------|
 | 1900 | -10               | 25                 |
 | 1910 | -15               | 30                 |
 | 1920 | -10               | 32                 |
 | 1930 | _N/A_             | _N/A_              |
 | 1940 | -2                | 40                 |

Store code snippets with preformatted blocks:

{{{python
def hello(world):
    for x in range(10):
        print("Hello {0} number {1}".format(world, x))

}}}
Text started with 4 or more spaces is a blockquote.
4 or more dashes at the start of the line is a 'horizontal line' (<hr />): ----
Mathematical formula are highlighted, and can be rendered in HTML using the powerful open source display engine MathJax (http://www.mathjax.org/).
You can have todo lists -- lists of items you can check/uncheck. Consider the following example:

= Toggleable list of todo items =
  * [X] Toggle list item on/off.
    * [X] Simple toggling between [ ] and [X].
    * [X] All list's subitems should be toggled on/off appropriately.
    * [X] Toggle child subitems only if current line is list item
    * [X] Parent list item should be toggled depending on it's child items.
  * [X] Make numbered list items toggleable too
  * [X] Add highlighting to list item boxes
  * [X] Add [ ] to the next created with o, O and <CR> list item.

Pressing <C-Space> on the first list item will toggle it and all of its child items. <C-Space> adjusts parents items also. It is possible to toggle several list items using visual mode.
See extensive help for markup syntax :h vimwiki-syntax .

What I read in 2014

2014-12-28T18:12:00.000-08:00

Science Fiction

Electronics, Non fiction

Make: Electronics by Charles Platt

How to Install Arch Linux on Asus Chromebox

2014-07-01T14:55:00.001-07:00

I decided to write down the instruction how to install Arch Linux on Asus Chromebox. I replaced my Raspberry Pi with Asus Chromebox as TV media box recently and such instruction will be useful in the case if I want to repeat installation.
I just want to warn - it does not create dual boot with ChromeOS and it just replaces ChromeOS with Arch Linux. I’m fine with such result, because I don’t need ChromeOS on my TV. XMBC is my choice for a TV media box.

1. Enable development mode and legacy boot

It’s an essential step to run Arch Linux live media from USB port. You can use following instructions from ChromiumOS Wiki.

2. Update firmware

The updated version of firmware contains the fix for booting from USB. Download from http://johnlewis.ie/asus-chromebox-SeaBIOS-new.bin
And run in ChromeOS shell:

sudo flashrom -w -i RW_LEGACY:asus-chromebox-SeaBIOS-new.bin

3. Set firmware boot flags

In order to enable legacy boot by default you need to set several boot flags. You need to disable firmware write protect. Please, follow the instruction from XBMC Wiki.
And run in ChromeOS shell:

sudo set_gbb_flags.sh 0x489

It enables 1 second boot wait time and legacy boot as default option. So there is no need to press CTRL-L to boot Arch Linux on each start of Chromebox.

4. Prepare Arch Linux live media

The one important tip: the latest version (May 2014) is failing to boot in x86_64 mode. So you need to get some older image. It is not a issue, you will get the latest version of packages during install with Internet connection. I got 2013 ISO image from here.
The instruction for preparing USB media is here.

5. Install Arch Linux

The Beginner’s Guide is a good start point for a novice. At the end you will get minimal Arch Linux environment. The next steps depend from your needs. Don’t forget to install SSH server to enable remote access to Chromebox.

6. Install XBMC (optional)

Install following packages to run XBMC as default Desktop Environment:

sudo pacman -S xorg-server xorg-xinit xf86-video-intel xbmc

That’s all and enjoy Arch Linux on your Asus Chromebox.

How to enable I2C (IIC) in Raspberry Pi

2014-04-07T21:03:00.000-07:00

The simple instruction for enabling I2C interface in Raspberry Pi (Rasbian).

I2C (or IIC) is a universal bidirectional bus. I2C is common standard designed to allow one device communicate with another.
The bus can connect multiple devices, each device has an unique address to distinguish them.
Raspberry Pi supports I2C, but it’s disabled by default in Rasbian.

So here is steps for configuring I2C.

Enable kernel modules for I2C

sudo echo "i2c-bcm2708" >> /etc/modules
sudo echo "i2c-dev" >> /etc/modules

Remove enabled modules from kernel black list. Open file

sudo nano /etc/modprobe.d/raspi-blacklist.conf

and comment out the lines below:

    #blacklist spi-bcm2708
    #blacklist i2c-bcm2708

.. by putting a # in front of them. Save file.

Reboot system.

sudo reboot

Install I2C tools and Python library

Install following packages from default repositories

sudo apt-get install python-smbus
sudo apt-get install i2c-tools

Check connected devices

Use following commnd for Raspberry Pi Model B:

sudo i2cdetect -y 1

And for Raspberry Pi Model A:

sudo i2cdetect -y 0

See example:

It shows that an one I2C address is in use - 0x77. So you can use it for communication with I2C device.
Now your Pi is ready to use I2C devices.

Coursera courses

2014-02-11T14:45:00.001-08:00

At the beginning of February I've been enrolled for two courses:

Algorithms, Part I (Coursera) by Kevin Wayne, Robert Sedgewick
Introduction to Guitar by Thaddeus Hogarth

The both of courses are fundamental for areas where my interest is high. Lets see how I will accomplish that, because the previous attempts were no so good for me, so many distractions didn't allow me to finish them in 2013 year. I hope I will be motivated enough for the next 6 weeks.

What I read in 2013

2014-01-04T19:25:00.000-08:00

Science Fiction

Fiction

Philosophy

Zen and the art of motorcycle maintenance by Pirsing Robert

Self improvements

Supermind by Tony Busen

Links dump for July 15, 2012

2012-07-15T05:27:00.002-07:00

Inspiration

Read the masters - Thoughts about learning complex things.

By studying the masters, not their pupils.
No Excuse List - The best plase on the web to learn anything, free.

Tools

Ack is a tool like grep, optimized for programmers.

Vim stuff

Vim Creep - Passionate essay about Vim.
Supertab - Perform all your Vim insert mode completions with Tab.
Ack for Vim - Vim plugin for Ack.

English

LinguaLeo - Enjoyable way to learn English.

Startup

Don't wast your time in crappy startup jobs.

Python development environment for Ubuntu 12.04 Precise

2012-05-05T08:09:00.000-07:00

Frankly, my upgrade for the newest release of Ubuntu 12.04 Precise broke my OS. And I didn't have any chance to recover it. So I just reinstalled Ubuntu and got fresh, but empty operation system. The last time when I did setup of Python development environment was one year ago. All my notes about this things were old and unsuitable for the latest Ubuntu release. This post is summary of my actions to setup Python development environment from scratch.
Install Python setuptools package:

sudo apt-get install python-setuptools python-pip

Install virtualenvwrapper:

sudo pip install virtualenvwrapper

Setup virtualenvwrapper:

mkdir -p ~/.virtualenvs
echo 'export WORKON_HOME=~/.virtualenvs' >> ~/.bashrc
echo 'export DJANGO_SITES_ROOT=$HOME/projects/' >> ~/.bashrc
echo 'source /usr/local/bin/virtualenvwrapper.sh' >> ~/.bashrc
source ~/.bashrc

Install Django extension for virtualenvwrapper. I have several Django projects, but if you aren't using Django, then you can skip this step:

sudo apt-get install git-core
mkdir -p ~/.virtualenvs/django-libs
cd ~/.virtualenvs/django-libs
git clone https://github.com/epicserve/django-environment.git
cd ~/.virtualenvs/django-libs/django-environment/django_env/bin/
install.py

Test virtualenvwrapper:

cd ~/projects
mkvirtualenv example
cd example && ls

Install PIL with JPEG, ZLib and FreeType support, if you aren't using PIL, then you can skip this step:

sudo apt-get install libjpeg62-dev zlib1g-dev libfreetype6-dev
cd ~/.virtualenvs/{project-name}

For 32-bit systems:

ln -s /usr/lib/i386-linux-gnu/libz.so ./lib/
ln -s /usr/lib/i386-linux-gnu/libjpeg.so ./lib/
ln -s /usr/lib/i386-linux-gnu/libfreetype.so ./lib/

For 64-bit systems:

ln -s /usr/lib/x86_64-linux-gnu/libz.so ./lib/
ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so ./lib/
ln -s /usr/lib/x86_64-linux-gnu/libfreetype.so ./lib/

pip install PIL

I'm big fan of Vim, so here is steps for Vim also:

sudo apt-get install vim.gtk

Install Pathogen plugin:

mkdir -p ~/.vim/autoload ~/.vim/bundle
curl -so ~/.vim/autoload/pathogen.vim https://raw.github.com/tpope/vim-pathogen/master/autoload/pathogen.vim

add to ~/.vimrc file:

call pathogen#infect()

Install Fugitive for Git support and Python-mode for all Python stuff in Vim:

cd ~/.vim/bundle
git clone git://github.com/tpope/vim-fugitive.git
git clone git://github.com/klen/python-mode.git

Install super-fast Command-T plugin for opening files in Vim:

cd ~/.vim/bundle
git clone git://git.wincent.com/command-t.git
cd ~/.vim/bundle/command-t
rake make

That's all folks. I will keep this post updated for a while.
And If you have any comments and suggestions, please, post them in comments. Thanks.

Онлайн курсы

2012-02-13T23:18:00.000-08:00

Стэнфордские онлайн курсы

http://www.cs101-class.org/ - Базовый курс Computer Science (базовые алгоритмы и понятия)
http://www.infotheory-class.org/ - Теория информации (алгоритмы и структуры данных для хранения, сжатия и передачи информации)
http://www.modelthinker-class.org/ - Теория моделирования (создание и управление моделями данных)
http://jan2012.ml-class.org/ - Теория машинного обучения (самообучаемые алгоритмы)
http://www.saas-class.org/ - Программное обеспечение как сервис (теория и практика построения SaaS)
http://www.hci-class.org/ - Теория взаимодействия человека с компьютером (проектирование пользовательских интерфейсов, юзабилити)
http://www.nlp-class.org/ - Обработка текста натуральных языков (лексический, семантический и синтаксический анализ текста)
http://www.game-theory-class.org/ - Теория игр (статистика, вероятности, стратегии, стохастический анализ)
http://www.pgm-class.org/ - Графическое моделирование (цепи Маркова, Байесовские сети, пересекается с Теорией машинного обучения)
http://www.crypto-class.org/ - Криптография (различные алгоритмы шифрования)
http://www.algo-class.org/ - Проектирование и анализ алгоритмов (фундаментальные понятия для проектирования алгоритмов, сортировка, поиск и т.д.)
http://www.security-class.org/ - Базовый курс компьютерной безопасности (проектирование и анализ систем безопасности для программ)
http://www.vision-class.org/ - Компьютерное видение (алгоритмы обработки изображений и видеопотока)

MIT онлайн курсы

http://mitx.mit.edu/ - Схематехника и электроника
http://courses.csail.mit.edu/6.006/spring11/notes.shtml - Введение в алгоритмы и структуры данных
http://courses.csail.mit.edu/6.851/spring12/ - Структуры данных (advanced)
http://relate.mit.edu/physicscourse - Ньютоновская механика

Другие

http://www.udacity.com/ - Computer science курсы от конкурентов Стэнфорда
http://www.cs.washington.edu/education/courses/csep501/08wi/lectures/index.html - Проектирование и создание компиляторов
http://www.khanacademy.org/ - Видео лекции по различным областям в том числе и Computer Science
http://projecteuler.net/ - различные задачи на программирование с возможностью контроля результата
http://tutsplus.com/course/30-days-to-learn-jquery/ - 30-дневный курс по jQuery
http://www.lektorium.tv/ - видео лекции от ведущих лекторов России
http://www.cognitivemedia.co.uk/ - видео лекции на различные темы с использованием когнитивных изображений

Light gray color schema for VIM

2012-01-12T08:06:00.000-08:00

I got bored with default dark desert color schema in VIM. So I decided to get some light gray color schema in Internet, but I didn't find any usable for me schema. Only "Peak Sea Color" schema was near of my wishes. And after several attempts of adopting this schema, I got the color schema which is satisfied me a lot. I made changes only for light background case. May be somebody will be interesting with this color schema. You can get this color schema from my GitHub repository - https://github.com/andreybratukhin/peakseacolor. Enjoy.

To enable the scheme, you need put the peaksea.vim in your $HOME/.vim/colors/ (or %HOME%\vimfiles\colors for Windows) and put in ~/.vimrc the following:

if !has("gui_running")
set t_Co=256
endif
set background=light

colorschema peaksea

UPDATE: I found very useful website, where you can create custom color schema for VIM - http://www.bilalquadri.com/villustrator/.

AspectJ training

2011-03-28T13:28:00.000-07:00

On previous week I held yet another training for our developers in Donetsk's office of Exadel. And I want to thank of Dmitry Chidzikov (Дмитрий Чижиков) for slides that he presented on February meet of Coffe'n'Code. I've used some of slides of Dmitry in my training's presentation. Thanks a lot.
See above my slides.
Aspect-Oriented Programming

View more presentations from Andrey Bratukhin.

Part 1 - JBoss Seam and component model

2011-02-04T04:21:00.000-08:00

Это слайды к тренингу по JBoss Seam, который я провел на этой неделе.

JBoss Seam 1 part

View more presentations from andreybratukhin.

GNU Emacs Starter Kit

2010-09-05T12:06:00.001-07:00

I have tried several text editors before - vim, Kate, notepad++ and some others. But I didn't find the editor, that had such power as Emacs. GNU Emacs is the extensible, customizable, self-documented and cross-platformed text editor. Emacs text editor are most popular with software developers, just like me. And I found some fun and cool features in this editor for me.

But Emacs is annoying for the first blush. To improve that situation I have installed Emacs Starter Kit. The main killing feature of Starter Kit is the package installer. Also you can find useful predefined key bindings and packages. All is ready out of box.

Official Site of GNU Emacs - http://www.gnu.org/software/emacs/

Instruction for installing Emacs Starter Kit - http://github.com/technomancy/emacs-starter-kit

Seattle, WA

2010-07-10T09:14:00.001-07:00

Вот я и оказался в Сиетле, штат Вашингтон, США. Из-за близкого расположения гор (Олипик, Рэйнер) и Тихого океана - погода здесь очень переменчивая. Например, утром может быть солнечно, а к обеду уже идет дождь и достаточно холодно. В апреле, мае и июне в основном держалась температура от 16 до 22 градусов Цельсия, т.е. было достаточно прохладно. Местные аборигены мне так и говорили, что лето здесь начинаеться в июле и заканчиваеться в конце сентября.

Основная достопримечательность - это, конечно, Space Needle (Космическая Иголка по-нашему). На верху этой башни находиться ресторан и смотровая площадка. В Space Needle лучше идти под вечер, перед закатом. Пока ты наслождаешься различными блюдами и напитками, то сам ресторан не стоит на месте, а крутиться вокруг оси. И если ты сидишь возле окна, то открываются изумительные виды на город и залив. Но лучше дождаться заката и увидеть ночной Сиетл с высоты птичьего полета. Дружно смотрим фотки на пикасе.

Pike Place (Market) - это убежище уличных торгащей, которые наживаются на бедных туристах. Но это место, как раз и интересно своим сборищем неординарных персонажей, которые стараються любыми способами привлечь внимание прохожих. Тут можно увидеть уличных музыкантов, фокусников, клоунов и просто попрашаек. Местные лавочники тоже стараються не отставать от этого балагана. Я сам стал свидетелем, когда турист купил рыбу и ждал около 10 минут, смотря на то, как продавцы перекидываю купленную рыбу из рук в руки и напивают песню, о том как тяжело было поймать эту рыбу в океане. Вообщем, покупка в этом месте может превратиться в небольшое представление, так что будьте готовы.

Как можно увидеть на фотографии, группа уличных музыкантов стоит возле Starbucks. Сиетл также известен тем, что именно в нем открылся первый магазин Starbucks, который в последствии превратился в супер-сеть кофейных магазинов. И теперь каждое утро американца, начинается с горячей чашки кофе Starbucks.

Продолжение следует...

Опять проблемы с Midnight Commander + zip + Ubuntu 9.10

2010-02-03T02:35:00.001-08:00

В очередной раз наткнулся в относительно новой Ubuntu 9.10 на проблему с mc и zip-архивами. mc не хотел показывать содержимое zip-архивов, но после недолгих поисков на просторах интернета была найдена таблетка и от этой болезни. Нужно просто изменить параметр в файле “/usr/share/mc/extfs/uzip” на
my $op_has_zipinfo=1;

Кстати, вышел новый стабильный релиз Midnight Commander 4.7.0.2 с множеством исправлений и улучшений. Советую поставить. Инструкция для Ubuntu - http://www.midnight-commander.org/wiki/Binaries.

Install PostgreSQL on Ubuntu 9.04/9.10

2009-10-08T03:24:00.001-07:00

Краткая пошаговая инструкция по установке PostgreSQL для Ubuntu 9.04/9.10.

Первый шаг - установка пакетов из репозитариев.
$ sudo apt-get install postgresql postgresql-client postgresql-contrib
$ sudo apt-get install pgadmin3

Изменяем пароль администратора БД по-умолчанию на что-нибудь более безопасное:
$ sudo su postgres -c psql template1
template1=# ALTER USER postgres WITH PASSWORD 'yourpasswordhere';
template1=# \q

Изменяем пароль пользователя, под которым запускается PostgreSQL:
$ sudo passwd -d postgres
$ sudo su postgres -c passwd

Устанавливаем так называемый "admin pack", который включает логирование и мониторинг для сервера:
для 9.04:
$ sudo su postgres -c psql < /usr/share/postgresql/8.3/contrib/adminpack.sql
для 9.10:
$ sudo su postgres -c psql < /usr/share/postgresql/8.4/contrib/adminpack.sql

Включаем доступ к серверу для внешних соединенний. В противном случае, вы сможете подключиться только с localhost.
Для этого открываем файл
для 9.04:
$ sudo gedit /etc/postgresql/8.3/main/postgresql.conf
для 9.10:
$ sudo gedit /etc/postgresql/8.4/main/postgresql.conf

и изменяем
#listen_addresses = 'localhost'
на
listen_addresses = '*'
а также включаем шифрование пароля
password_encryption = on

Теперь нужно описать, кто может подключаться к серверу. Для этого нужно изменить файл
для 9.04:
$ sudo gedit /etc/postgresql/8.3/main/pg_hba.conf
для 9.10:
$ sudo gedit /etc/postgresql/8.4/main/pg_hba.conf

И заключительный этап - перезапустить сервер.
для 9.04:
$ sudo /etc/init.d/postgresql-8.3 restart
для 9.10:
$ sudo /etc/init.d/postgresql-8.4 restart

ILBC кодек для Ekiga

2009-09-09T07:39:00.001-07:00

Вот хочется мне, чтобы, когда я разговаривал по Ekiga (VoIP клиент), собеседник не переспрашивал, что же я на самом деле сказал. И все потому, что дефолтные кодеки абсолютно не справляются на средних и мало пропускных каналах.

Чтобы решить проблему качества передачи голоса подключил ILBC кодек. Ниже маленькая инструкция как это сделать на Ubuntu 9.04:

1) добавить в /etc/apt/sources.list:
deb http://ppa.launchpad.net/bojo42/ekiga/ubuntu jaunty main
2) sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1901D523
3) sudo apt-get install libopal3.6.1-plugins-ilbc
4) в настройках Ekiga выбрать первым ILBC кодек.

Всё! Разговаривайте на здоровье.

Как избавиться от двойной строки приглашения в mc (Midnight Commander) [Рецепты]

2009-09-04T03:12:00.001-07:00

После установки очередного обновления для Ubuntu 9.04 я заметил очень неприятный для себя баг в mc (Midnight Commander). В командной строке выводиться дублированная строка приглашения.
Например,
0;username@computer-name:~/temp/folderusername@computer-name:~/temp/folder.

Естественно если вложенность папок начинает превышать более трех, то в командной строчке остается очень мало места для набора самой команды. И это очень и очень не удобно.

Вообщем после гугления выяснилось, что это ошибка в mc и что она уже пофикшена, но версия с фиксом еще не включена в дебианские репозитории. Таким образом у меня было три варианта: ждать, искать пропатченную версию и искать workaround solution.

Ждать не получилось. Исправленная версия находиться здесь - https://launchpad.net/~snizovtsev/+archive/ppa, но потом возникли бы проблемы с обновлением. Поэтому решил найти обходной путь.

Чтобы избавиться от двойной строки приглашения нужно закоментировать строку в .bashrc:
# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
# PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
;;
*)
;;
esac

или что правильнее создать отдельный файл ~/.mc/bashrc с нужными настройками для mc.