hotfiles/.functions

#!/usr/bin/env bash

function calc() {

    local result=""

    #                       ┌─ default (when --mathlib is used) is 20
    result="$( printf "scale=10;%s\n" "$*" | bc --mathlib | tr -d "\\\n" )"
    #                         remove the tailing "\" and "\n" ─┘
    #                         (large numbers are printed on multiple lines)

    if [[ "$result" == *.* ]]; then

        # Improve the output for decimal numbers.

        printf "%s" "$result" |
        sed -e "s/^\./0./"          # Add "0" for cases like ".5".` \
            -e "s/^-\./-0./"        # Add "0" for cases like "-.5".`\
            -e "s/0*$//;s/\.$//"    # Remove tailing zeros.

    else
        printf "%s" "$result"
    fi

    printf "\n"

}

# Create a new directory and enter it
function mkd() {
	mkdir -p "$@" && cd "$_";
}

# Create a .tar.gz archive, using `zopfli`, `pigz` or `gzip` for compression
function targz() {
	local tmpFile="${@%/}.tar";
	tar -cvf "${tmpFile}" --exclude=".DS_Store" "${@}" || return 1;

	size=$(
		stat -f"%z" "${tmpFile}" 2> /dev/null; # macOS `stat`
		stat -c"%s" "${tmpFile}" 2> /dev/null;  # GNU `stat`
	);

	local cmd="";
	if (( size < 52428800 )) && hash zopfli 2> /dev/null; then
		# the .tar file is smaller than 50 MB and Zopfli is available; use it
		cmd="zopfli";
	else
		if hash pigz 2> /dev/null; then
			cmd="pigz";
		else
			cmd="gzip";
		fi;
	fi;

	echo "Compressing .tar ($((size / 1000)) kB) using \`${cmd}\`…";
	"${cmd}" -v "${tmpFile}" || return 1;
	[ -f "${tmpFile}" ] && rm "${tmpFile}";

	zippedSize=$(
		stat -f"%z" "${tmpFile}.gz" 2> /dev/null; # macOS `stat`
		stat -c"%s" "${tmpFile}.gz" 2> /dev/null; # GNU `stat`
	);

	echo "${tmpFile}.gz ($((zippedSize / 1000)) kB) created successfully.";
}

# Determine size of a file or total size of a directory
function fs() {
	if du -b /dev/null > /dev/null 2>&1; then
		local arg=-sbh;
	else
		local arg=-sh;
	fi
	if [[ -n "$@" ]]; then
		du $arg -- "$@";
	else
		du $arg .[^.]* ./*;
	fi;
}

# Use Git’s colored diff when available
hash git &>/dev/null;
if [ $? -eq 0 ]; then
	function diff() {
		git diff --no-index --color-words "$@";
	}
fi;

# Create a data URL from a file
function dataurl() {
	local mimeType=$(file -b --mime-type "$1");
	if [[ $mimeType == text/* ]]; then
		mimeType="${mimeType};charset=utf-8";
	fi
	echo "data:${mimeType};base64,$(openssl base64 -in "$1" | tr -d '\n')";
}

# Create a git.io short URL
function gitio() {
	if [ -z "${1}" -o -z "${2}" ]; then
		echo "Usage: \`gitio slug url\`";
		return 1;
	fi;
	curl -i https://git.io/ -F "url=${2}" -F "code=${1}";
}

# Start an HTTP server from a directory, optionally specifying the port
#function server() {
#	local port="${1:-8000}";
#	sleep 1 && open "http://localhost:${port}/" &
	# Set the default Content-Type to `text/plain` instead of `application/octet-stream`
	# And serve everything as UTF-8 (although not technically correct, this doesn’t break anything for binary files)
#	python -c $'import SimpleHTTPServer;\nmap = SimpleHTTPServer.SimpleHTTPRequestHandler.extensions_map;\nmap[""] = "text/plain";\nfor key, value in map.items():\n\tmap[key] = value + ";charset=UTF-8";\nSimpleHTTPServer.test();' "$port";
#}

# Start a PHP server from a directory, optionally specifying the port
# (Requires PHP 5.4.0+.)
function phpserver() {
	local port="${1:-4000}";
	local ip=$(ipconfig getifaddr en0);
	sleep 1 && open "http://${ip}:${port}/" &
	php -S "${ip}:${port}";
}

# Compare original and gzipped file size
function gz() {
	local origsize=$(wc -c < "$1");
	local gzipsize=$(gzip -c "$1" | wc -c);
	local ratio=$(LC_ALL="en_US" echo "$gzipsize * 100 / $origsize" | bc -l);
	printf "orig: %d bytes\n" "$origsize";
	LC_ALL="en_US" printf "gzip: %d bytes (%2.2f%%)\n" "$gzipsize" "$ratio";
}

# Syntax-highlight JSON strings or files
# Usage: `json '{"foo":42}'` or `echo '{"foo":42}' | json`
function json() {
	if [ -t 0 ]; then # argument
		python -mjson.tool <<< "$*" | pygmentize -l javascript;
	else # pipe
		python -mjson.tool | pygmentize -l javascript;
	fi;
}

# Run `dig` and display the most useful info
function digga() {
  if alias colourify >/dev/null 2>&1
		then
		 shopt -s expand_aliases
     colourify dig +nocmd "$1" any +multiline +noall +answer;
    else
     dig +nocmd "$1" any +multiline +noall +answer;
	fi
}

# UTF-8-encode a string of Unicode symbols
function escape() {
	printf "\\\x%s" $(printf "$@" | xxd -p -c1 -u);
	# print a newline unless we’re piping the output to another program
	if [ -t 1 ]; then
		echo ""; # newline
	fi;
}

# Decode \x{ABCD}-style Unicode escape sequences
function unidecode() {
	perl -e "binmode(STDOUT, ':utf8'); print \"$@\"";
	# print a newline unless we’re piping the output to another program
	if [ -t 1 ]; then
		echo ""; # newline
	fi;
}

# Get a character’s Unicode code point
function codepoint() {
	perl -e "use utf8; print sprintf('U+%04X', ord(\"$@\"))";
	# print a newline unless we’re piping the output to another program
	if [ -t 1 ]; then
		echo ""; # newline
	fi;
}

# Show all the names (CNs and SANs) listed in the SSL certificate
# for a given domain
function getcertnames() {
	if [ -z "${1}" ]; then
		echo "ERROR: No domain specified.";
		return 1;
	fi;

	local domain="${1}";
	echo "Testing ${domain}…";
	echo ""; # newline

	local tmp=$(echo -e "GET / HTTP/1.0\nEOT" \
		| openssl s_client -connect "${domain}:443" -servername "${domain}" 2>&1);

	if [[ "${tmp}" = *"-----BEGIN CERTIFICATE-----"* ]]; then
		local certText=$(echo "${tmp}" \
			| openssl x509 -text -certopt "no_aux, no_header, no_issuer, no_pubkey, \
			no_serial, no_sigdump, no_signame, no_validity, no_version");
		echo "Common Name:";
		echo ""; # newline
		echo "${certText}" | grep "Subject:" | sed -e "s/^.*CN=//" | sed -e "s/\/emailAddress=.*//";
		echo ""; # newline
		echo "Subject Alternative Name(s):";
		echo ""; # newline
		echo "${certText}" | grep -A 1 "Subject Alternative Name:" \
			| sed -e "2s/DNS://g" -e "s/ //g" | tr "," "\n" | tail -n +2;
		return 0;
	else
		echo "ERROR: Certificate not found.";
		return 1;
	fi;
}

# `v` with no arguments opens the current directory in Vim, otherwise opens the
# given location
function v() {
	if [ $# -eq 0 ]; then
		vim .;
	else
		vim "$@";
	fi;
}

# `tre` is a shorthand for `tree` with hidden files and color enabled, ignoring
# the `.git` directory, listing directories first. The output gets piped into
# `less` with options to preserve color and line numbers, unless the output is
# small enough for one screen.
function tre() {
	tree -aC -I '.git|node_modules|bower_components' --dirsfirst "$@" | less -FRNX;
}

# Copy w/ progress
cp_p () {
  rsync -WavP --human-readable --progress "$1" "$2"
}

# transfer.sh from https://gist.github.com/nl5887/a511f172d3fb3cd0e42d
transfer() {
    if [ $# -eq 0 ];
    then
        echo "No arguments specified. Usage:\necho transfer /tmp/test.md\ncat /tmp/test.md | transfer test.md"
        return 1
    fi

    tmpfile=$( mktemp -t transferXXX )

    file=$1

    if tty -s;
    then
        basefile=$(basename "$file" | sed -e 's/[^a-zA-Z0-9._-]/-/g')

        if [ ! -e $file ];
        then
            echo "File $file doesn't exists."
            return 1
        fi

        if [ -d $file ];
        then
            # zip directory and transfer
            zipfile=$( mktemp -t transferXXX.zip )
            cd $(dirname $file) && zip -r -q - $(basename $file) >> $zipfile
            curl --progress-bar --upload-file "$zipfile" "https://transfer.sh/$basefile.zip" >> $tmpfile
            rm -f $zipfile
        else
            # transfer file
            curl --progress-bar --upload-file "$file" "https://transfer.sh/$basefile" >> $tmpfile
        fi
    else
        # transfer pipe
        curl --progress-bar --upload-file "-" "https://transfer.sh/$file" >> $tmpfile
    fi

    cat $tmpfile
    rm -f $tmpfile
}

# movie goodies
# animated gifs from any video
# from alex sexton   gist.github.com/SlexAxton/4989674
gifify() {
  if [[ -n "$1" ]]; then
    if [[ $2 == '--good' ]]; then
      ffmpeg -i $1 -r 10 -vcodec png out-static-%05d.png
      time convert -verbose +dither -layers Optimize -resize 900x900\> out-static*.png  GIF:- | gifsicle --colors 128 --delay=5 --loop --optimize=3 --multifile - > $1.gif
      rm out-static*.png
    else
      ffmpeg -i $1 -s 600x400 -pix_fmt rgb24 -r 10 -f gif - | gifsicle --optimize=3 --delay=3 > $1.gif
    fi
  else
    echo "proper usage: gifify <input_movie.mov>. You DO need to include extension."
  fi
}

# turn that video into webm.
# brew reinstall ffmpeg --with-libvpx
webmify(){
	ffmpeg -i $1 -vcodec libvpx -acodec libvorbis -isync -copyts -aq 80 -threads 3 -qmax 30 -y $2 $1.webm
 }

ffconcat(){
	if [ -e "$1" ]; then
		echo "Error: First argument is the output file and it should _not_ exist ($1)"
	else
	  ffmpeg -f concat -safe 0 -i <(printf "file '$PWD/%s'\n" "${@:2}") -c copy "$1"
	fi
}

# weather forecast
#
weather(){
	if [ -z "$1" ]; then
		curl -4 -A Curl wttr.in
	else
		curl -4 -A Curl wttr.in/`urlencode "$*"`
	fi
}


# For cleaning up aur helper cache
paccompare(){
installed_packages=($(pacman -Q | cut -d' ' -f1))

current_dir_contents=(*)

is_package() {
    local dir="$1"
    for package in "${installed_packages[@]}"; do
        if [[ "$dir" == "$package" ]]; then
            return 0
        fi
    done
    return 1
}

for dir in "${current_dir_contents[@]}"; do
    if [[ -d "$dir" ]] && ! is_package "$dir"; then
        echo "$dir"
    fi
done
}