log_pipeline — extended multi-file DCli sample

> Attribution. The tom_d4rt project is an extended clone of the original > d4rt project by Moustapha Kodjo Amadou, initially published in 2025. The > complete interpreter is based on his idea.

A file-processing pipeline written as a multi-file D4rt CLI script. It synthesises a few sample .log files in a temp directory, then runs a parse → filter → aggregate pipeline over them and emits both a coloured console summary and a written report file.

It is the command-line analog of the Flutter "extended sample" apps — a real multi-file program with a staged data-flow design, value types, and the DCli filesystem bridges doing the I/O.

Files

File	Role
main.dart	Entry point — fixture generation + pipeline wiring
models.dart	LogEntry value type + line parser (tryParse)
stages.dart	ParseStage, FilterStage, AggregateStage
report.dart	Report value type + plain-text and coloured renderers

What it exercises

• Staged, cross-file data flow — three single-responsibility stages

composed from main.dart via relative imports. - Filesystem bridges — createTempDir, find, read, cat, exists, deleteDir, and the String.write path extension. - Robust parsing — malformed lines are skipped via a nullable LogEntry.tryParse. - Colour output — per-level ASCII bars rendered with red, yellow, green, grey from DCli.

Running

# Aggregate every level
dcli main.dart

# Keep only the listed levels (case-insensitive)
dcli main.dart ERROR WARN
dcli main.dart INFO

# Plain Dart works too (it is ordinary Dart source)
dart run main.dart ERROR

Positional arguments are the log levels to keep; with no arguments the pipeline aggregates all levels.