nika 0.35.4

Semantic YAML workflow engine for AI tasks - DAG execution, MCP integration, multi-provider LLM support
Documentation 
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# COMPLEX-83: Read file -> process lines -> write output
# Tests: exec file I/O, multi-step processing, temp file management
schema: nika/workflow@0.12
workflow: complex-exec-file-processing

tasks:
  # Create temp input file
  - id: create_input
    exec:
      command: "echo -e 'apple\\nbanana\\ncherry\\ndate\\nelderberry\\nfig\\ngrape' > /tmp/nika-test-83-input.txt && echo 'CREATED'"
      shell: true
    description: "Create test input file"

  # Count lines
  - id: count_lines
    depends_on: [create_input]
    exec:
      command: "wc -l < /tmp/nika-test-83-input.txt | tr -d ' '"
      shell: true
    description: "Count lines in input"

  # Sort file
  - id: sort_file
    depends_on: [create_input]
    exec:
      command: "sort /tmp/nika-test-83-input.txt"
      shell: true
    description: "Sort file contents"

  # Filter (lines > 5 chars)
  - id: filter_long
    depends_on: [create_input]
    exec:
      command: "awk 'length > 5' /tmp/nika-test-83-input.txt"
      shell: true
    description: "Filter lines longer than 5 chars"

  # Uppercase transform
  - id: uppercase_all
    depends_on: [create_input]
    exec:
      command: "tr '[:lower:]' '[:upper:]' < /tmp/nika-test-83-input.txt"
      shell: true
    description: "Uppercase all lines"

  # Combine processed outputs
  - id: combine
    depends_on: [count_lines, sort_file, filter_long, uppercase_all]
    with:
      count: $count_lines | trim
      sorted: $sort_file | trim
      filtered: $filter_long | trim
      upper: $uppercase_all | trim
    exec:
      command: "echo 'Lines: {{with.count}}' && echo 'Sorted: {{with.sorted}}' && echo 'Long: {{with.filtered}}' && echo 'Upper: {{with.upper}}'"
      shell: true
    description: "Combine all processing results"

  # Analyze
  - id: analyze
    depends_on: [combine, count_lines]
    with:
      processed: $combine | trim
      count: $count_lines | trim
    infer: "We processed {{with.count}} lines of fruit data: {{with.processed}}. Summarize the processing in one sentence."
    provider: openai
    model: gpt-4.1-mini
    max_tokens: 50
    description: "LLM summary of file processing"

  # Cleanup
  - id: cleanup
    depends_on: [analyze]
    exec: "rm -f /tmp/nika-test-83-input.txt && echo 'CLEANED'"
    description: "Remove temp files"