.functions

.functions

# 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./'        `# add "0" for cases like ".5"` \
            -e 's/^-\./-0./'      `# add "0" for cases like "-.5"`\
            -e 's/0*$//;s/\.$//';  # remove trailing zeros
    else
        printf "$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; # OS X `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 using \`${cmd}\`…";
    "${cmd}" -v "${tmpFile}" || return 1;
    [ -f "${tmpFile}" ] && rm "${tmpFile}";
    echo "${tmpFile}.gz created successfully.";
}

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


# find shorthand
function f() {
    find . -name "$1"
}

# Start an HTTP server from a directory, optionally specifying the port
function server() {
    local port="${1:-8000}"
    open "http://localhost:${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"
}

# git log with per-commit cmd-clickable GitHub URLs (iTerm)
function gf() {
  local remote="$(git remote -v | awk '/^origin.*\(push\)$/ {print $2}')"
  [[ "$remote" ]] || return
  local user_repo="$(echo "$remote" | perl -pe 's/.*://;s/\.git$//')"
  git log $* --name-status --color | awk "$(cat <<AWK
    /^.*commit [0-9a-f]{40}/ {sha=substr(\$2,1,7)}
    /^[MA]\t/ {printf "%s\thttps://github.com/$user_repo/blob/%s/%s\n", \$1, sha, \$2; next}
    /.*/ {print \$0}
AWK
  )" | less -F
}


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


# 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"
}

# Syntax-highlight JSON strings or files
function json() {
    if [ -p /dev/stdin ]; then
        # piping, e.g. `echo '{"foo":42}' | json`
        python -mjson.tool | pygmentize -l javascript
    else
        # e.g. `json '{"foo":42}'`
        python -mjson.tool <<< "$*" | pygmentize -l javascript
    fi
}

# take this repo and copy it to somewhere else minus the .git stuff.
function gitexport(){
    mkdir -p "$1"
    git archive master | tar -x -C "$1"
}



# get gzipped size
function gz() {
    echo "orig size    (bytes): "
    cat "$1" | wc -c
    echo "gzipped size (bytes): "
    gzip -c "$1" | wc -c
}


# Extract archives - use: extract <file>
# Based on http://dotfiles.org/~pseup/.bashrc
function extract() {
    if [ -f "$1" ] ; then
        local filename=$(basename "$1")
        local foldername="${filename%%.*}"
        local fullpath=`perl -e 'use Cwd "abs_path";print abs_path(shift)' "$1"`
        local didfolderexist=false
        if [ -d "$foldername" ]; then
            didfolderexist=true
            read -p "$foldername already exists, do you want to overwrite it? (y/n) " -n 1
            echo
            if [[ $REPLY =~ ^[Nn]$ ]]; then
                return
            fi
        fi
        mkdir -p "$foldername" && cd "$foldername"
        case $1 in
            *.tar.bz2) tar xjf "$fullpath" ;;
            *.tar.gz) tar xzf "$fullpath" ;;
            *.tar.xz) tar Jxvf "$fullpath" ;;
            *.tar.Z) tar xzf "$fullpath" ;;
            *.tar) tar xf "$fullpath" ;;
            *.taz) tar xzf "$fullpath" ;;
            *.tb2) tar xjf "$fullpath" ;;
            *.tbz) tar xjf "$fullpath" ;;
            *.tbz2) tar xjf "$fullpath" ;;
            *.tgz) tar xzf "$fullpath" ;;
            *.txz) tar Jxvf "$fullpath" ;;
            *.zip) unzip "$fullpath" ;;
            *) echo "'$1' cannot be extracted via extract()" && cd .. && ! $didfolderexist && rm -r "$foldername" ;;
        esac
    else
        echo "'$1' is not a valid file"
    fi
}


# 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
}