AWS Credentials autocomplete setup.

.bashrc

# Append this to your ~/.bashrc or ~/.bash_profile

# Switch to a specified AWS profile globally
function aws_switch_profile() {
  local profile=${1:-"default"}
  export AWS_PROFILE="$profile"
}

# Setup autocomplete for the above command
setup_aws_profile_complete (){
  local credentialsjson=$(<path-to-your-project>/build/index.js -f ~/.aws/credentials)
  local keynames=$(echo "$credentialsjson" | jq -r 'keys[]')
  complete -W "$keynames" aws_switch_profile
}
setup_aws_profile_complete

README.md

aws_switch_profile

Sets up autocomplete for switching based on your ~/.aws/credentials file.

Instructions

Note: you'll need jq installed, brew install jq should do it.

1. Create a new typescript project, and copy the parse-credential-file.ts file into it

npm init --y && npm i yargs typescript && npm i -D @types/node @types/yargs && npx tsc --init

2. Compile the ts file using ncc eg.

npx @vercel/ncc build parse-credential-file.ts -o build/

(The reason Im using ncc is that it allows you to move the compiled JS file into another directory without having to worry about dependencies - max portability!)

3. Update the bashrc script above with the build path (line 11)

4. Source your bash_profile/bashrc, eg. source ~/.bash_profile to pick up your changes

5. Try it out! Type aws_switch_profile <TAB> in a shell.

parse-credential-file.ts

#!/usr/bin/env node
import yargs from 'yargs/yargs'
import { existsSync, readFileSync } from 'fs'
import { resolve } from 'path'
// @ts-expect-error
import { hideBin } from 'yargs/helpers'

const { file }: any = yargs(hideBin(process.argv))
  .usage('Usage: $0 -f [file]')
  .demandOption(['f'])
  .alias('f', 'file')
  .describe('f', 'File to parse')
  .argv

const parseCredentialFile = (ini: string) => {
  let section: string
  const out = Object.create(null)
  const re = /^\[([^\]]+)\]\s*$|^([a-z_]+)\s*=\s*(.+?)\s*$/
  const lines = ini.split(/\r?\n/)

  lines.forEach(line => {
    const match = line.match(re)
    if (!match) return
    if (match[1]) {
      section = match[1]
      // eslint-disable-next-line no-eq-null, eqeqeq
      if (out[section] == null) out[section] = Object.create(null)
    } else if (section) {
      out[section][match[2]] = match[3]
    }
  })

  return out
}

try {
  const filePath = resolve(__dirname, file);
  if (!existsSync(filePath)) {
    throw new Error(`File ${filePath} does not exist`)
  }
  const fileAsString = readFileSync(filePath, 'utf-8');
  console.log(JSON.stringify(parseCredentialFile(fileAsString), null, 2));
} catch (error) {
  console.error(error)
}