/
newton
executable file
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/
newton
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#!/usr/bin/env bash
# Author: Alexander Epstein https://github.com/alexanderepstein
currentVersion="1.22.1"
configuredClient=""
flagCount="0"
declare -a simpleOperations=(simplify factor derive integrate zeroes roots tangent area cos sin tan arccos arcsin arctan abs log)
## This function determines which http get tool the system has installed and returns an error if there isnt one
getConfiguredClient()
{
if command -v curl &>/dev/null; then
configuredClient="curl"
elif command -v wget &>/dev/null; then
configuredClient="wget"
elif command -v http &>/dev/null; then
configuredClient="httpie"
elif command -v fetch &>/dev/null; then
configuredClient="fetch"
else
echo "Error: This tool reqires either curl, wget, httpie or fetch to be installed." >&2
return 1
fi
}
## Allows to call the users configured client without if statements everywhere
httpGet()
{
case "$configuredClient" in
curl) curl -A curl -s "$@" ;;
wget) wget -qO- "$@" ;;
httpie) http -b GET "$@" ;;
fetch) fetch -q "$@" ;;
esac
}
checkInternet()
{
httpGet github.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query github with a get request
}
update()
{
# Author: Alexander Epstein https://github.com/alexanderepstein
# Update utility version 2.2.0
# To test the tool enter in the defualt values that are in the examples for each variable
repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
latestVersion=$(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option
if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]]; then
echo "Error: update utility has not been configured correctly." >&2
exit 1
elif [[ $latestVersion == "" ]]; then
echo "Error: no active internet connection" >&2
exit 1
else
if [[ "$latestVersion" != "$currentVersion" ]]; then
echo "Version $latestVersion available"
echo -n "Do you wish to update $repositoryName [Y/n]: "
read -r answer
if [[ "$answer" == [Yy] ]]; then
cd ~ || { echo 'Update Failed'; exit 1; }
if [[ -d ~/$repositoryName ]]; then rm -r -f $repositoryName || { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
echo -n "Downloading latest version of: $repositoryName."
git clone -q "https://github.com/$githubUserName/$repositoryName" && touch .BSnippetsHiddenFile || { echo "Failure!"; exit 1; } &
while [ ! -f .BSnippetsHiddenFile ]; do { echo -n "."; sleep 2; };done
rm -f .BSnippetsHiddenFile
echo "Success!"
cd $repositoryName || { echo 'Update Failed'; exit 1; }
git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
./$nameOfInstallFile "update" || exit 1
cd ..
rm -r -f $repositoryName || { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
else
exit 1
fi
else
echo "$repositoryName is already the latest version"
fi
fi
}
validateExpression()
{
local parsedExpression # only used here
originalEquation=$(echo $1 | sed "s/\[/\(/g" | sed "s/\]/\)/g") # accont for the fact that we have to use brackets and not parenthesis
parsedExpression=$(echo $1 | sed "s/\[/\(/g" | sed "s/\]/\)/g" | grep -Eo "[0-9 + -- / * ^ . a-z A-Z ~ : ( ) ]*") # only grepping valid characters
if [ "$parsedExpression" != "$originalEquation" ];then { echo "Error: Expression contains invalid characters"; return 1; }; fi # compare result to original
return 0
}
encodeEquation()
{
equation=$(echo $originalEquation | sed "s:/:(over):g" | sed "s/~/|/g" | sed "s/-/%2D/g") # encode all the special characters
}
validateOperation()
{
operation=$(echo $1 | tr "[[:upper:]]" "[[:lower:]]") # get rid of case being an issue
validOp="false" # lets us know if oeration is valid
for op in "${simpleOperations[@]}"; do # go through all valid simple operations
if [[ "$op" == "$operation" ]]; then { opType="simple"; validOp="true"; break; }; fi # if the operation matches leave the loop
done
if ! $validOp; then { echo "Error: invalid operation, run newton -h to get a list of valid operations"; return 1; }; fi # if not a valid operation error out
if [[ $operation == "roots" ]]; then operation=zeroes;fi # I gave the ability to use root or zeores but real op is zeroes
}
getSimpleResponse()
{
result=$(httpGet https://newton.now.sh/$operation/$equation | grep -Eo '"result":"[a-z A-Z 0-9 ( ) \^ / -- + , ]*' | sed s/'"result":"'//g | tr '"' " ") # get reponse, grab result
if [[ $result == "" ]];then { echo "Error: no result was returned, did you use valid characters?"; return 1; }; fi # if result is empty sometthing went wrong...
}
printAnswer()
{
cat <<EOF
================================
|Operation: $operation
|Expression: $originalEquation
|Result: $result
================================
EOF
}
usage()
{
cat <<EOF
Newton
Description: Performs numerical calculations all the way up to symbolic math parsing.
Usage: newton [optionalFlags] [operation] [expression] or newton [flag]
-r Only print the result, useful for piping output elsewhere
-u Update Bash-Snippet Tools
-h Show the help
-v Get the tool version
===================================================
|Operations Sample Expression Sample Result|
|---------------------------------------------------|
|Simplify [[2x^2]+7]*[4x^2] 8 x^4 + 28 x^2 |
|Factor x^2 + 2x x (x + 2) |
|Derive x^2+2x 2 x + 2 |
|Integrate x^2+2x 1/3 x^3 + x^2 +C|
|Roots/Zeroes x^2+2x 2, 0 |
|Tangent 2~x^3 12 x + -16 | (Finding tangent line when x=2 for expression x^3)
|Area 2:4~x^3 60 | (Finding area under curve from 2 to 4 for expression x^3)
|Cos pi -1 |
|Sin pi 0 |
|Tan pi/4 1 |
|ArcCos 1 0 |
|ArcSin 0 0 |
|ArcTan pi arcsin(pi) |
|Abs -2 2 |
|Log 2~8 3 | (Log base 2 of eight)
===================================================
Valid Symbols:
+ add
- subtract
[ left parenthesis (you must use brackets bash has a bultin for parenthesis)
] right parenthesis (you must use brackets bash has a bultin for parenthesis)
* multiply
/ divide
^ power
: between the range of left and right side (only for area under curve)
~ parameter on right side (only for area, tangent line and log)
EOF
}
getConfiguredClient || exit 1
while getopts "ur:vh" opt; do
case "$opt" in
\?) echo "Invalid option: -$OPTARG" >&2
exit 1
;;
h) usage
exit 0
;;
v) echo "Version $currentVersion"
exit 0
;;
u) update
exit 0
;;
r) resultOnly="true" && flagCount=$((flagCount + 1 ));;
:) echo "Option -$OPTARG requires an argument." >&2
exit 1
;;
esac
done
if [[ $# == "0" ]]; then usage && exit 0
elif [[ $# == "1" ]]; then
if [[ $1 == "update" ]]; then checkInternet && update && exit 0 || exit 1
elif [[ $1 == "help" ]]; then usage && exit 0 || exit 1
else echo "Error: newton needs two arguments, operation and expression" && exit 1;fi
elif [ $# -gt 3 ];then echo "Error: newton only accepts two arguments, operation and expression" && exit 1;fi
# flagCount helps us determine what argument to pass to the functions
# flow: validateOperation, validateExpression, encodeEquation, getResponse, print Answer/Result
checkInternet || exit 1
if [[ $flagCount == "0" ]];then validateOperation $1 || exit 1
elif [[ $flagCount == "1" ]];then validateOperation $2 || exit 1; fi
if [[ $flagCount == "0" ]];then validateExpression $2 || exit 1
elif [[ $flagCount == "1" ]];then validateExpression $3 || exit 1; fi
encodeEquation || exit 1
if [[ $opType == "simple" ]];then getSimpleResponse || exit 1;fi
if [ -z $resultOnly ];then printAnswer
else echo $result; fi