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#!/usr/bin/env bash
# ./script/task.sh: Run a VSCode task from tasks.json including its dependencies.
#
# Usage: ./scripts/task.sh TASK_LABEL
#
# This script looks for .vscode/tasks.json in your workspace folder (or current directory)
# and executes the command associated with the given task label.
#
# It also handles the "dependsOn" field recursively.
#
# Requirements: jq sed
# https://jackson.dev/post/a-portable-nix-shell-shebang/
if [ -z "$INSIDE_NIX_RANDOMSTRING" ] && command -v nix &> /dev/null; then
# If the user has nix, relaunch in nix shell with dependencies added
INSIDE_NIX_RANDOMSTRING=1 nix shell \
nixpkgs#jq \
nixpkgs#gnused \
--command "$0" "$@"
exit $?
fi
required_dependencies=(jq sed)
# Check if the dependencies are installed
for cmd in "${required_dependencies[@]}"; do
if ! command -v "$cmd" &> /dev/null; then
echo "Error: '$cmd' is not installed. Please install it and try again." >&2
exit 1
fi
done
set -euo pipefail
# Use WORKSPACE_FOLDER if set; otherwise, assume current directory.
WORKSPACE_FOLDER="${WORKSPACE_FOLDER:-$(pwd)}"
TASKS_FILE="$WORKSPACE_FOLDER/.vscode/tasks.json"
if [ ! -f "$TASKS_FILE" ]; then
echo "Error: tasks.json not found at $TASKS_FILE" >&2
exit 1
fi
if [ $# -lt 1 ]; then
echo "Usage: $0 TASK_LABEL" >&2
exit 1
fi
# Remove comment lines (lines starting with //) from the tasks file to be compliant with the JSON format.
TASKS_JSON=$(sed '/^[[:space:]]*\/\//d' "$TASKS_FILE")
TASK_LABEL="$1"
shift
# run_task recursively looks up the task by label,
# runs any dependencies first, then executes its command.
run_task() {
local label="$1"
echo "Looking up task: $label"
# Get the task object from the cleaned JSON.
local task
task=$(echo "$TASKS_JSON" | jq --arg label "$label" -r '.tasks[] | select(.label == $label)')
if [ -z "$task" ]; then
echo "Error: Task with label '$label' not found in $TASKS_FILE" >&2
exit 1
fi
# If the task has dependencies, run them first.
local depends
depends=$(echo "$task" | jq -r '.dependsOn? // empty')
if [ -n "$depends" ] && [ "$depends" != "null" ]; then
# "dependsOn" can be an array or a string.
if echo "$depends" | jq -e 'if type=="array" then . else empty end' >/dev/null; then
for dep in $(echo "$depends" | jq -r '.[]'); do
run_task "$dep"
done
else
run_task "$depends"
fi
fi
# Check if the task has either a command or script.
local has_command has_script
has_command=$(echo "$task" | jq -r 'has("command")')
has_script=$(echo "$task" | jq -r 'has("script")')
if [[ "$has_command" != "true" && "$has_script" != "true" ]]; then
echo "Task '$label' has no command or script; skipping execution."
return
fi
# Determine the command to run:
local cmd=""
if echo "$task" | jq 'has("command")' | grep -q "true"; then
cmd=$(echo "$task" | jq -r '.command')
elif echo "$task" | jq 'has("script")' | grep -q "true"; then
local script
script=$(echo "$task" | jq -r '.script')
local path
path=$(echo "$task" | jq -r '.path // empty')
if [ -n "$path" ]; then
cmd="cd $path && npm run $script"
else
cmd="npm run $script"
fi
else
echo "Error: Task '$label' does not have a command or script." >&2
exit 1
fi
# Substitute ${workspaceFolder} with the actual folder path.
cmd="${cmd//\$\{workspaceFolder\}/$WORKSPACE_FOLDER}"
echo "Running task '$label': $cmd"
# Run the task in a subshell so that directory changes don't persist.
( eval "$cmd" )
}
run_task "$TASK_LABEL"
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