Script to manually set the environmentVariables of all the kits in VSCode's CMake Tools' .vscode/cmake-kits.json

set_kits_env_vars.sh

#!/bin/bash

# Usage: source ./set_kits_env_vars.sh /path/to/your/environment/setup/script

# Prerequisites: jq (sudo apt-get install -y jq)

# This script sources the environment script provided by the given argument
# and sets all the "environmentVariables" fields in .vscode/cmake-kits.json accordingly.

# TODO:
# This script will be deprecated once the feature requested
# at https://github.com/vector-of-bool/vscode-cmake-tools/issues/288 is added.

# TODO:
# This script gives all the kits the same "environmentVariables" object,
# which is wrong. It should instead just do this for one kit.
# Make it so that you can provide the "name" of the one kit that should be changed.

# TODO:
# If your running this script for a toolchain kit, then you'll still need 
# to edit the resulting .vscode/cmake-kits.json file so the "toolchainFile" field
# comes after the "environmentVariables" object, so that the toolchain file can access 
# the environment variables.

source "$1"
env > .env
# Loop through the lines in .env,
# as seen at https://stackoverflow.com/questions/1521462/looping-through-the-content-of-a-file-in-bash
INPUT_JSON_FILE=".vscode/cmake-kits.json"
TMP_INDEX=1
TMP_JSON_FILE="tmp$TMP_INDEX.json"

while IFS="" read -r line || [ -n "$line" ]
do
  KEY=$(printf '%s\n' "$line" | cut -d "=" -f 1)
  VAL=$(printf '%s\n' "$line" | cut -d "=" -f 2-)
  # echo $KEY
  # echo $VAL
  
  # The first time this command runs, it uses .vscode/cmake-kits.json as the input JSON file.
  # All subsequent times it runs, it uses tmp$TMP_INDEX.json as the input file, 
  # where TMP_INDEX is incremented every loop iteration.
  # This is necessary because jq needs a new input file every time, or else the output file will be empty.
  cat "$INPUT_JSON_FILE" | jq --arg KEY "$KEY" --arg VAL "$VAL" '.[].environmentVariables[$KEY]=$VAL' -M > $TMP_JSON_FILE
  INPUT_JSON_FILE="$TMP_JSON_FILE"

  # Increment the index.
  TMP_INDEX=$((TMP_INDEX+1))
  TMP_JSON_FILE="tmp$TMP_INDEX.json"
done < .env

# Get the name of the last created tmp JSON file.
# That file will have all the "environmentVariables" fields set.
TMP_INDEX=$((TMP_INDEX-1))
TMP_JSON_FILE="tmp$TMP_INDEX.json"

# Overwrite .vscode/cmake-kits.json
mv $TMP_JSON_FILE .vscode/cmake-kits.json

# Remove all the temporary files that this script used
rm .env
rm tmp*.json