dotfiles/includes/bash_functions.bash

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# Create a new directory and enter it
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function md() {
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mkdir -p "$@" && cd "$@"
}
# Get gzipped file size
function gz() {
echo "Original size (bytes): "
cat "$1" | wc -c
echo "Gzipped size (bytes): "
gzip -c "$1" | wc -c
}
# Test if HTTP compression (RFC 2616 + SDCH) is enabled for a given URL.
# Send a fake UA string for sites that sniff it instead of using the Accept-Encoding header. (Looking at you, ajax.googleapis.com!)
function httpcompression() {
encoding="$(curl -LIs -H 'User-Agent: Mozilla/5 Gecko' -H 'Accept-Encoding: gzip,deflate,compress,sdch' "$1" | grep '^Content-Encoding:')" && echo "$1 is encoded using ${encoding#* }" || echo "$1 is not using any encoding"
}
# Escape UTF-8 characters into their 3-byte format
function escape() {
printf "\\\x%s" $(printf "$@" | xxd -p -c1 -u)
echo # newline
}
# Decode \x{ABCD}-style Unicode escape sequences
function unidecode() {
perl -e "binmode(STDOUT, ':utf8'); print \"$@\""
echo # newline
}
# Get a characters Unicode code point
function codepoint() {
perl -e "use utf8; print sprintf('U+%04X', ord(\"$@\"))"
echo # newline
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}
# Extract archives of various types
function extract() {
if [ -f $1 ] ; then
local dir_name=${1%.*} # Filename without extension
case $1 in
*.tar.bz2) tar xjf $1 ;;
*.tar.gz) tar xzf $1 ;;
*.tar.xz) tar Jxvf $1 ;;
*.tar) tar xf $1 ;;
*.tbz2) tar xjf $1 ;;
*.tgz) tar xzf $1 ;;
*.bz2) bunzip2 $1 ;;
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*.rar) unrar x $1 $2 ;;
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*.gz) gunzip $1 ;;
*.zip) unzip -d$dir_name $1 ;;
*.Z) uncompress $1 ;;
*) echo "'$1' cannot be extracted via extract()" ;;
esac
else
echo "'$1' is not a valid file"
fi
}
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# Print nyan cat
# https://github.com/steckel/Git-Nyan-Graph/blob/master/nyan.sh
# If you want big animated version: `telnet miku.acm.uiuc.edu`
function nyan() {
e='\033'
RESET="$e[0m"
BOLD="$e[1m"
CYAN="$e[0;96m"
RED="$e[0;91m"
YELLOW="$e[0;93m"
GREEN="$e[0;92m"
echo
echo -en $RED'-_-_-_-_-_-_-_'
echo -e $RESET$BOLD',------,'$RESET
echo -en $YELLOW'_-_-_-_-_-_-_-'
echo -e $RESET$BOLD'| /\_/\\'$RESET
echo -en $GREEN'-_-_-_-_-_-_-'
echo -e $RESET$BOLD'~|__( ^ .^)'$RESET
echo -en $CYAN'-_-_-_-_-_-_-'
echo -e $RESET$BOLD'"" ""'$RESET
echo
}
# Creates an SSH key and uploads it to the given host
configure_ssh_host() {
username=$1
hostname=$2
identifier=$3
if [[ "$identifier" == "" ]] || [[ "$username" == "" ]] || [[ "$hostname" == "" ]]
then
echo "Usage: configure_ssh_host <username> <hostname> <identifier>"
else
if [ ! -f "$HOME/.ssh/$identifier.id_rsa" ]; then
ssh-keygen -f ~/.ssh/$identifier.id_rsa -C "$USER $(date +'%Y/%m%/%d %H:%M:%S')"
fi
if ! grep -Fxiq "host $identifier" "$HOME/.ssh/config"; then
echo -e "Host $identifier\n\tHostName $hostname\n\tUser $username\n\tIdentityFile ~/.ssh/$identifier.id_rsa" >> ~/.ssh/config
fi
ssh $identifier 'mkdir -p .ssh && cat >> ~/.ssh/authorized_keys' < ~/.ssh/$identifier.id_rsa.pub
tput bold; ssh -o PasswordAuthentication=no $identifier true && { tput setaf 2; echo "SSH key added."; } || { tput setaf 1; echo "Failure"; }; tput sgr0
ssh_load_autocomplete
fi
}
# Adds ~/.ssh/config to the ssh autocomplete
ssh_load_autocomplete() {
complete -W "$(awk '/^\s*Host\s*/ { sub(/^\s*Host /, ""); print; }' ~/.ssh/config)" ssh
}
ssh_load_autocomplete