Elements Script by /u/xereeto

#!/bin/bash
#######################
## Element Script by ##
## /u/xereeto. for   ##
## best results put  ##
## this script in    ##
## your PATH & name  ##
## it "element".     ##
#######################
#prints usage message if element is not found
if [ -z $1 ]; then
    #yes I could have used basename, but I didn't because fuck the system
    S0=${0##*/}
    echo "Usage: "
    echo "  \"$S0 <element name>\""
    echo "  \"$S0 -n <atomic number>\""
    echo "  \"$S0 -s <atomic symbol>\""
    exit 1
else
    S1="${1,,}"
fi
#chassive element (the chemical kind) array. warning.
element[1]="hydrogen:H"
element[2]="helium:He"
element[3]="lithium:Li"
element[4]="beryllium:Be"
element[5]="boron:B"
element[6]="carbon:C"
element[7]="nitrogen:N"
element[8]="oxygen:O"
element[9]="fluorine:F"
element[10]="neon:Ne"
element[11]="sodium:Na"
element[12]="magnesium:Mg"
element[13]="aluminium:Al"
element[14]="silicon:Si"
element[15]="phosphorus:P"
element[16]="sulfur:S"
element[17]="chlorine:Cl"
element[18]="argon:Ar"
element[19]="potassium:K"
element[20]="calcium:Ca"
element[21]="scandium:Sc"
element[22]="titanium:Ti"
element[23]="vanadium:V"
element[24]="chromium:Cr"
element[25]="manganese:Mn"
element[26]="iron:Fe"
element[27]="cobalt:Co"
element[28]="nickel:Ni"
element[29]="copper:Cu"
element[30]="zinc:Zn"
element[31]="gallium:Ga"
element[32]="germanium:Ge"
element[33]="arsenic:As"
element[34]="selenium:Se"
element[35]="bromine:Br"
element[36]="krypton:Kr"
element[37]="rubidium:Rb"
element[38]="strontium:Sr"
element[39]="yttrium:Y"
element[40]="zirconium:Zr"
element[41]="niobium:Nb"
element[42]="molybdenum:Mo"
element[43]="technetium:Tc"
element[44]="ruthenium:Ru"
element[45]="rhodium:Rh"
element[46]="palladium:Pd"
element[47]="silver:Ag"
element[48]="cadmium:Cd"
element[49]="indium:In"
element[50]="tin:Sn"
element[51]="antimony:Sb"
element[52]="tellurium:Te"
element[53]="iodine:I"
element[54]="xenon:Xe"
element[55]="caesium:Cs"
element[56]="barium:Ba"
element[57]="lanthanum:La"
element[58]="cerium:Ce"
element[59]="praseodymium:Pr"
element[60]="neodymium:Nd"
element[61]="promethium:Pm"
element[62]="samarium:Sm"
element[63]="europium:Eu"
element[64]="gadolinium:Gd"
element[65]="terbium:Tb"
element[66]="dysprosium:Dy"
element[67]="holmium:Ho"
element[68]="erbium:Er"
element[69]="thulium:Tm"
element[70]="ytterbium:Yb"
element[71]="lutetium:Lu"
element[72]="hafnium:Hf"
element[73]="tantalum:Ta"
element[74]="tungsten:W"
element[75]="rhenium:Re"
element[76]="osmium:Os"
element[77]="iridium:Ir"
element[78]="platinum:Pt"
element[79]="gold:Au"
element[80]="mercury:Hg"
element[81]="thallium:Tl"
element[82]="lead:Pb"
element[83]="bismuth:Bi"
element[84]="polonium:Po"
element[85]="astatine:At"
element[86]="radon:Rn"
element[87]="francium:Fr"
element[88]="radium:Ra"
element[89]="actinium:Ac"
element[90]="thorium:Th"
element[91]="protactinium:Pa"
element[92]="uranium:U"
element[93]="neptunium:Np"
element[94]="plutonium:Pu"
element[95]="americium:Am"
element[96]="curium:Cm"
element[97]="berkelium:Bk"
element[98]="californium:Cf"
element[99]="einsteinium:Es"
element[100]="fermium:Fm"
element[101]="mendelevium:Md"
element[102]="nobelium:No"
element[103]="lawrencium:Lr"
element[104]="rutherfordium:Rf"
element[105]="dubnium:Db"
element[106]="seaborgium:Sg"
element[107]="bohrium:Bh"
element[108]="hassium:Hs"
element[109]="meitnerium:Mt"
element[110]="darmstadtium:Ds"
element[111]="roentgenium:Rg"
element[112]="copernicium:Cn"
element[113]="ununtrium:Uut"
element[114]="flerovium:Fl"
element[115]="ununpentium:Uup"
element[116]="livermorium:Lv"
element[117]="ununseptium:Uus"
element[118]="ununoctium:Uuo"
#end of chassive array.
#processes command line options
if [ "$1" == "-n" ]; then
    if ! [[ "$2" =~ ^[0-9]+$ ]] ; then
        #if the user is an arsehole and enters a non-number
        echo -e "\e[1;31mInvalid Atomic Number - NaN\e[00m"
        exit 1
    fi
    if [ "$2" -lt "1" ]; then
        #if the user thinks there is an element with 0 protons
        echo -e "\e[1;31mInvalid Atomic Number - too low!\e[00m"
        exit 1
    elif [ "$2" -gt "118" ]; then
        #if the user thinks more elements have been discarvard
                echo -e "\e[1;31mInvalid Atomic Number - too high!\e[00m"
                exit 1
    fi
    #because of my formatting in the array, it is easy to extract the element name
    #to pass to the server later.
    S1=${element[$2]%:*}
elif [ "$1" == "-s" ]; then
    #converts to sentence case, in case the user decides that HE==He
    S2=`echo "$2" | sed 's/.*/\L&/; s/[a-z]*/\u&/g'`
    #stores the entire element array in a space-delimited variable
    elarr=`echo "${element[@]}"`
    #converts spaces to newlines so the list can be grepped, then greps for the
    #symbol the user provided
    elarr=`echo "${elarr// /$'\n'}" | grep -w "$S2"` #yes, I use backticks instead of $(). Old habits...
    if [ -z "$elarr" ]; then
        #if the user made a typo, mistake or just straight-up invented an element
        echo -e "\e[1;31mError!\e[00m Element not found!"
        exit 1
    fi
    #truncates the symbol so the name can be sent to the server
    S1=${elarr%:*} #i thought I'd comment on naming my var S1. I was trying to directly
               #modify $1, then I realized I couldn't, so instead of a long var name, S1 did fine.
fi
#now to actually download the element's info page.
bk=$(curl -L -silent www.webelements.com/$S1)
#replace bullet point tags with newlines.
bk=${bk//<li>/$'\n'}
#now to strip HTML tags
bk=$(echo "$bk" | sed "s/<[^>]\+>//g")
#from here it's just grepping for info about the element.
el_name=$(echo "$bk" | grep "Name: ")
el_name=${el_name:7} #where did 7 come from? answer: I counted the number of characters before the actual value
             #on the web page, and that amount was 7.
if [ -z "$el_name" ]; then
    #if the text "Name: " is not found on the page, that means the server 404'd.
    echo -e "\e[1;31mERROR: \e[00melement \"$S1\" not found."
    exit 1
fi
el_sym=$(echo "$bk" | grep "Symbol: ")
el_sym=${el_sym:9}
el_num=$(echo "$bk" | grep "Atomic number: ")
el_num=${el_num:16}
el_mass=$(echo "$bk" | grep "Atomic weight: ")
el_mass=${el_mass:16}
if [ "$el_num" == "3" ]; then
    #for some reason Lithium has [ ]s round its atomic mass, which is shit because only one of them
    #will show up since the mass has a decimal point. To compensate I remove the left [.
    el_mass=" ${el_mass:2}"
fi
#find where the decimal point is
el_mass_index=$(expr index "$el_mass" '.')
if [ $el_mass_index == 0 ]; then
    #yes, I could have used if [ ! ... ]. but I didn't.
    echo > /dev/null
else
    #none of that rounding bullshit here. Just straight up truncating.
    let el_mass_index=$(expr index "$el_mass" '.')+2
    el_mass=${el_mass:0:($el_mass_index)}
fi
#fixes a small problem with radioactive elements
el_mass="${el_mass/[/ [}"
el_state=$(echo "$bk" | grep "Standard state: ")
el_state=${el_state:16}
el_group=$(echo "$bk" | grep "Group in periodic table: ")
el_group=${el_group:26}
#some elements don't have a group.
if [ -z "$el_group" ]; then
    el_group="N/A"
fi
el_period=$(echo "$bk" | grep "Period in periodic table: ")
el_period=${el_period:27}
el_color=$(echo "$bk" | grep "Colour: ")
el_color=${el_color:9}
el_class=$(echo "$bk" | grep "Classification: ")
el_class=${el_class:16}
#formats the info in a nice neat table.
echo -e "\e[1;31m"
echo "$el_name"
echo -e "\e[00m"
(echo -e "\e[1;36mName%\e[00m $el_name"
echo -e "\e[1;36mSymbol %\e[00m $el_sym"
echo -e "\e[1;36mAtomic Number %\e[00m $el_num"
echo -e "\e[1;36mAtomic Mass%\e[00m$el_mass"
echo -e "\e[1;36mStandard State%\e[00m$el_state"
echo -e "\e[1;36mGroup in Periodic Table %\e[00m $el_group"
echo -e "\e[1;36mPeriod in Periodic Table%\e[00m$el_period"
echo -e "\e[1;36mColor %\e[00m $el_color"
echo -e "\e[1;36mClassification %\e[00m $el_class")| column -t -s "%"
echo #done!!
################################
##                ##
## Hope you like this script! ##
##     Made for reddit by     ##
##         /u/xereeto!        ##
##             `  ,#          ##
##            . ,#. +         ##
##            @   @,.         ##
##            '               ##
##        `#@++@#             ##
##       +;@        @;+       ##
##    @ +          # @        ##
##    .@  `;;  ;;`  #,        ##
##     #   ;,  ,;   @         ##
##     @            @         ##
##     `.  ;    ;  ,          ##
##      .;  `''`  '`          ##
##        +#,``:@'            ##
##       :+      ',           ##
##       ++      '#           ##
##       ,+      ;:           ##
##       ';      ,#           ##
##       '`       :           ##
##        .:    '`            ##
##        ,@    @,            ##
##       #  ;  +  +           ##
##       @@@@@@@@@@           ##
##                            ##
################################