mirror of
https://github.com/alexanderepstein/Bash-Snippets
synced 2018-11-08 02:59:35 +01:00
214 lines
8.7 KiB
Bash
Executable file
214 lines
8.7 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Author: Alexander Epstein https://github.com/alexanderepstein
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currentVersion="1.20.0"
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configuredClient=""
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flagCount="0"
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declare -a simpleOperations=(simplify factor derive integrate zeroes roots tangent area cos sin tan arccos arcsin arctan abs log)
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## This function determines which http get tool the system has installed and returns an error if there isnt one
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getConfiguredClient()
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{
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if command -v curl &>/dev/null; then
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configuredClient="curl"
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elif command -v wget &>/dev/null; then
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configuredClient="wget"
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elif command -v http &>/dev/null; then
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configuredClient="httpie"
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elif command -v fetch &>/dev/null; then
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configuredClient="fetch"
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else
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echo "Error: This tool reqires either curl, wget, httpie or fetch to be installed." >&2
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return 1
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fi
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}
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## Allows to call the users configured client without if statements everywhere
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httpGet()
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{
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case "$configuredClient" in
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curl) curl -A curl -s "$@" ;;
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wget) wget -qO- "$@" ;;
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httpie) http -b GET "$@" ;;
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fetch) fetch -q "$@" ;;
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esac
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}
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checkInternet()
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{
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httpGet github.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query github with a get request
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}
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update()
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{
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# Author: Alexander Epstein https://github.com/alexanderepstein
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# Update utility version 2.2.0
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# To test the tool enter in the defualt values that are in the examples for each variable
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repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
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githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
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nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
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latestVersion=$(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
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if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]]; then
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echo "Error: update utility has not been configured correctly." >&2
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exit 1
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elif [[ $latestVersion == "" ]]; then
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echo "Error: no active internet connection" >&2
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exit 1
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else
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if [[ "$latestVersion" != "$currentVersion" ]]; then
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echo "Version $latestVersion available"
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echo -n "Do you wish to update $repositoryName [Y/n]: "
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read -r answer
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if [[ "$answer" == [Yy] ]]; then
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cd ~ || { echo 'Update Failed'; exit 1; }
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if [[ -d ~/$repositoryName ]]; then rm -r -f $repositoryName || { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
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echo -n "Downloading latest version of: $repositoryName."
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git clone -q "https://github.com/$githubUserName/$repositoryName" && touch .BSnippetsHiddenFile || { echo "Failure!"; exit 1; } &
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while [ ! -f .BSnippetsHiddenFile ]; do { echo -n "."; sleep 2; };done
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rm -f .BSnippetsHiddenFile
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echo "Success!"
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cd $repositoryName || { echo 'Update Failed'; exit 1; }
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git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
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chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
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./$nameOfInstallFile "update" || exit 1
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cd ..
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rm -r -f $repositoryName || { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
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else
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exit 1
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fi
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else
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echo "$repositoryName is already the latest version"
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fi
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fi
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}
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validateExpression()
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{
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local parsedExpression # only used here
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originalEquation=$(echo $1 | sed "s/\[/\(/g" | sed "s/\]/\)/g") # accont for the fact that we have to use brackets and not parenthesis
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parsedExpression=$(echo $1 | sed "s/\[/\(/g" | sed "s/\]/\)/g" | grep -Eo "[0-9 + -- / * ^ . a-z A-Z ~ : ( ) ]*") # only grepping valid characters
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if [ "$parsedExpression" != "$originalEquation" ];then { echo "Error: Expression contains invalid characters"; return 1; }; fi # compare result to original
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return 0
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}
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encodeEquation()
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{
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equation=$(echo $originalEquation | sed "s:/:(over):g" | sed "s/~/|/g" | sed "s/-/%2D/g") # encode all the special characters
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}
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validateOperation()
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{
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operation=$(echo $1 | tr "[[:upper:]]" "[[:lower:]]") # get rid of case being an issue
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validOp="false" # lets us know if oeration is valid
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for op in "${simpleOperations[@]}"; do # go through all valid simple operations
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if [[ "$op" == "$operation" ]]; then { opType="simple"; validOp="true"; break; }; fi # if the operation matches leave the loop
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done
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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
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if [[ $operation == "roots" ]]; then operation=zeroes;fi # I gave the ability to use root or zeores but real op is zeroes
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}
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getSimpleResponse()
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{
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result=$(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
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if [[ $result == "" ]];then { echo "Error: no result was returned, did you use valid characters?"; return 1; }; fi # if result is empty sometthing went wrong...
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}
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printAnswer()
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{
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cat <<EOF
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================================
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|Operation: $operation
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|Expression: $originalEquation
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|Result: $result
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================================
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EOF
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}
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usage()
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{
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cat <<EOF
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Newton
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Description: Performs numerical calculations all the way up to symbolic math parsing.
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Usage: newton [optionalFlags] [operation] [expression] or newton [flag]
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-r Only print the result, useful for piping output elsewhere
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-u Update Bash-Snippet Tools
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-h Show the help
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-v Get the tool version
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===================================================
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|Operations Sample Expression Sample Result|
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|---------------------------------------------------|
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|Simplify [[2x^2]+7]*[4x^2] 8 x^4 + 28 x^2 |
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|Factor x^2 + 2x x (x + 2) |
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|Derive x^2+2x 2 x + 2 |
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|Integrate x^2+2x 1/3 x^3 + x^2 +C|
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|Roots/Zeroes x^2+2x 2, 0 |
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|Tangent 2~x^3 12 x + -16 | (Finding tangent line when x=2 for expression x^3)
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|Area 2:4~x^3 60 | (Finding area under curve from 2 to 4 for expression x^3)
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|Cos pi -1 |
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|Sin pi 0 |
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|Tan pi/4 1 |
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|ArcCos 1 0 |
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|ArcSin 0 0 |
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|ArcTan pi arcsin(pi) |
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|Abs -2 2 |
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|Log 2~8 3 | (Log base 2 of eight)
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===================================================
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Valid Symbols:
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+ add
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- subtract
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[ left parenthesis (you must use brackets bash has a bultin for parenthesis)
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] right parenthesis (you must use brackets bash has a bultin for parenthesis)
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* multiply
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/ divide
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^ power
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: between the range of left and right side (only for area under curve)
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~ parameter on right side (only for area, tangent line and log)
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EOF
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}
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getConfiguredClient || exit 1
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while getopts "ur:vh" opt; do
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case "$opt" in
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\?) echo "Invalid option: -$OPTARG" >&2
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exit 1
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;;
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h) usage
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exit 0
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;;
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v) echo "Version $currentVersion"
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exit 0
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;;
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u) update
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exit 0
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;;
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r) resultOnly="true" && flagCount=$((flagCount + 1 ));;
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:) echo "Option -$OPTARG requires an argument." >&2
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exit 1
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;;
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esac
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done
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if [[ $# == "0" ]]; then usage && exit 0
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elif [[ $# == "1" ]]; then
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if [[ $1 == "update" ]]; then checkInternet && update && exit 0 || exit 1
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elif [[ $1 == "help" ]]; then usage && exit 0 || exit 1
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else echo "Error: newton needs two arguments, operation and expression" && exit 1;fi
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elif [ $# -gt 3 ];then echo "Error: newton only accepts two arguments, operation and expression" && exit 1;fi
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# flagCount helps us determine what argument to pass to the functions
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# flow: validateOperation, validateExpression, encodeEquation, getResponse, print Answer/Result
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checkInternet || exit 1
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if [[ $flagCount == "0" ]];then validateOperation $1 || exit 1
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elif [[ $flagCount == "1" ]];then validateOperation $2 || exit 1; fi
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if [[ $flagCount == "0" ]];then validateExpression $2 || exit 1
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elif [[ $flagCount == "1" ]];then validateExpression $3 || exit 1; fi
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encodeEquation || exit 1
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if [[ $opType == "simple" ]];then getSimpleResponse || exit 1;fi
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if [ -z $resultOnly ];then printAnswer
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else echo $result; fi
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