Yargs appears to fall mostly in the When All we had was Callbacks camp. I’ve noticed the ongoing challenges/evolution of single threaded asynchronous programming means there’s a few distinct styles out there I’m coming up on the one year anniversary of NodeJS being my primary programming language, and I’m starting to get a better feel for how folks organize their programs and libraries.
NODEJS COMMAND LINE ARGUMENTS PLUS
It’s also been around for six plus years and is still receiving updates. Yargs provides mature argument and option parsing for command line programs (both -foo and -b style options) and features for defining individual sub-commands (think programs like git sub-command). The pile of one-off command line scripts I’ve written for my current weekend projecting finally reached the critical mass where they needed some organizing, which led me to discover the yargs project. That Efficiency of Programming Languages Image Trying to Understand Mastodon's Federation Quick dispatches from the life of a working programmer.Īccessing Docker Desktop's Virtual Machineįive Reasons Your PHP Application is Hard to Containerize for Production Grab a copy and start working with Magento instead of against it. Whether you’re just starting out or you’re a seasoned pro, Commerce Bug will save you and your team hours everyday. The must have debugging extension for anyone using Magento. Yargs and Command Line Argument Processing in NodeJS astorm That Efficiency of Programming Languages ImageĬopyright © Alan Storm 1975 – 2023 All Rights Reserved.Trying to Understand Mastodon’s Federation.Running Go Programs in Docker Scratch Containers.Five Reasons Your PHP Application is Hard to Containerize for Production.Accessing Docker Desktop’s Virtual Machine.Then the object returned by parseArgs() contains a property. We can get access to the tokens if we set config.tokens to true. Phase 2: It assembles the tokens into the object that is returned via the result property.However, if an option has a value then the token stores both option name and option value and therefore contains the data of two args elements. Phase 1: It parses args into an Array of tokens: These tokens are mostly the elements of args annotated with type information: Is it an option? Is it a positional? Etc.ParseArgs() processes the args Array in two phases: This is how parseArgs() handles quoted values:Ĭonst options = ) 16.4 parseArgs tokens ', '%USERNAME%' ] 16.3.4.2 How parseArgs() handles quoted values > node args.mjs 'backtick`' '\t\n' '%USERNAME%'
NODEJS COMMAND LINE ARGUMENTS WINDOWS
In Windows PowerShell, we can quote with single quotes, variable names are not interpolated inside quotes and single quotes can’t be escaped: > node args.mjs "say `"hi`"" "\t\n" "%USERNAME%" >node args.mjs -s "two words" -s 'two words' >node args.mjs -str='two words' -str="two words" Quoted option values in the Windows Command shell: >node args.mjs -str 'two words' -str "two words" >node args.mjs 'back slash\' '\t\n' '%USERNAME%' In the Windows Command shell single quotes are not special in any way: >node args.mjs "say \"hi\"" "\t\n" "%USERNAME%" args.mjs -str="two words" -str='two words' args.mjs -str "two words" -str 'two words' The following interaction demonstrates option values that are doube-quoted and single-quoted: %. Single quotes: all content is passed on verbatim and we can’t escape quotes: %.
On Unix, these are the differences between double quotes and single quotes:ĭouble quotes: we can escape quotes with backslashes (which are otherwise passed on verbatim) and variables are interpolated: %.
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