.bash_functions

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

# Change working directory to the top-most Finder window location
function cdf() { # short for `cdfinder`
	cd "$(osascript -e 'tell app "Finder" to POSIX path of (insertion location as alias)')";
}

# 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;

# 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";
}


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

# Run `dig` and display the most useful info
function digga() {
	dig +nocmd "$1" any +multiline +noall +answer;
}

# Create a new tmux session with a specified name
function tmuxnew() {
  tmux new -s $1
}

# Attach a tmux session
function tmuxopen() {
  tmux attach -t $1
}

# kill a tmux session
function tmuxkill() {
  tmux kill-session -t $1
}

# create a new tmux session based on the current working directory
function tmuxnew-dir(){
  tmux new -s "basename $PWD"
}

# Simple calculator
function calc() {
  local result=""
  result="$(printf "scale=10;$*\n" | bc --mathlib | tr -d '\\\n')"
  #                                               └─ default (when `--mathlib` is used) is 20

  if [[ "$result" == *.* ]]; then
    # improve the output for decimal numbers
    printf "$result" |
    sed -e 's/^\./0./'-e      ` #add "0" for cases like ".5"` \
        -e 's/^-\./-0./'-0.   ` #add "0" for cases like "-.5"`\
        -e 's/0*$//;s/\.$//';   # remove trailing zeros
  else
    printf "$result"
  fi

  printf "\n"
}

# 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')"
}

# 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;
}

# check if uri is up
function isup() {
	local uri=$1
	if curl -s --head  --request GET "$uri" | grep "200 OK" > /dev/null ; then
		notify-send --urgency=critical "$uri is down"
	else
		notify-send --urgency=low "$uri is up"
	fi
}

# Get colors in manual pages
function man() {
	env \
		LESS_TERMCAP_mb=$(printf "\e[1;31m") \
		LESS_TERMCAP_md=$(printf "\e[1;31m") \
		LESS_TERMCAP_me=$(printf "\e[0m") \
		LESS_TERMCAP_se=$(printf "\e[0m") \
		LESS_TERMCAP_so=$(printf "\e[1;44;33m") \
		LESS_TERMCAP_ue=$(printf "\e[0m") \
		LESS_TERMCAP_us=$(printf "\e[1;32m") \
		man "$@"
}

# Use feh to nicely view images
function openimage() {
	local types='*.jpg *.JPG *.png *.PNG *.gif *.GIF *.jpeg *.JPEG'
	cd $(dirname "$1")
	local file=$(basename "$1")
	feh -q $types --auto-zoom \
		--sort filename --borderless \
		--scale-down --draw-filename \
		--image-bg black \
		--start-at "$file"
}

# `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.
tre() {
	tree -aC -I '.git' --dirsfirst "$@" | less -FRNX
}

# Call from a local repo to open the repository on github/bitbucket in browser
function repo() {
  local giturl=$(git config --get remote.origin.url | sed 's/git@/\/\//g' | sed 's/.git$//' | sed 's/https://g' | sed 's/:/\//g')
  if [[ $giturl == "" ]]; then
		echo "Not a git repository or no remote.origin.url is set."
	else
		local gitbranch=$(git rev-parse --abbrev-ref HEAD)
		local giturl="http:${giturl}"
		if [[ $gitbranch != "master" ]]; then
			local giturl="${giturl}/tree/${gitbranch}"
		fi
		echo $giturl
		open $giturl
	fi
}

# search command from history
function grepH() {
  history | grep  "$1"
}

# Normalize `open` across Linux, macOS, and Windows.
# This is needed to make the `o` function (see below) cross-platform.
if [ ! $(uname -s) = 'Darwin' ]; then
	if grep -q Microsoft /proc/version; then
		# Ubuntu on Windows using the Linux subsystem
		alias open='explorer.exe';
	else
		alias open='xdg-open';
	fi
fi

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