codeecho 1.0.1

A developer tool that scans your codebase to detect and highlight echoes of duplicated or near-duplicated code, so you can refactor toward cleaner, more maintainable designs.

Prerequisites

• Python >=3.14

Installation

pip install codeecho

Usage

python -m codeecho <path> [options]

Clone detection levels

Type	Detection strategy	Example
Type-1	Exact copy-paste — identical token sequences	Two functions with the same code copied verbatim
Type-2	Structural clone — same structure, renamed identifiers / literals	Same logic with different variable names
Type-3	Near-duplicate — high Jaccard similarity on token sets	Nearly identical functions with a few extra lines

Supported languages

Language	Extensions
Python	.py
JavaScript	.js, .mjs, .cjs
TypeScript	.ts, .tsx
Java	.java
Go	.go
Gosu	.gs, .gsx

Arguments

Argument	Description
path	Root directory to scan.

Options

Option	Default	Description
--types <types>	all	Clone types to detect: comma-separated (1, 2, 3) or all.
--threshold <float>	0.8	Jaccard similarity threshold for Type-3 detection (0.0–1.0).
--output <name>	codeecho-output	Base name (without extension) for output file(s).
--output-dir <dir>	<cwd>/reports	Directory where output file(s) will be written.
--db-dir <dir>	~/.codeecho	Directory for the SQLite scratch database (codeecho.db). Session records are removed after the report is written.
--format <fmt>	both	Output format: json, html, or both.
--min-tokens <n>	10	Minimum token count for a code fragment to be included.
--exclude <pattern>	(none)	Glob pattern(s) to exclude from scanning (repeatable).
--version		Print the version and exit.
-h, --help		Show help and exit.

Examples

Scan the current directory and write both JSON and HTML reports:

python -m codeecho .

Detect only Type-1 and Type-2 clones in a src/ tree:

python -m codeecho src --types 1,2

Scan with a custom output name and directory:

python -m codeecho . --output my-scan --output-dir audit/reports

Lower the Type-3 threshold to catch more near-duplicates:

python -m codeecho . --threshold 0.6

Exclude test and vendor directories:

python -m codeecho . --exclude "*/tests/*" --exclude "*/vendor/*"

Configuration

Environment variable	Description
CODEECHO_CONFIG_DIR	Directory where logging.ini and .ignore are seeded on first run. When unset, the bundled copies inside the package are used directly.

.ignore file

On first run, a .ignore file is seeded into CODEECHO_CONFIG_DIR (or the package directory when unset). It follows gitignore syntax and is applied during file scanning to exclude paths in addition to any --exclude patterns passed on the command line. Edit this file to permanently suppress paths you never want scanned.

Development

Prerequisites

• Poetry 2.2+

Setup

poetry install

Run

poetry run python -m codeecho <path> [options]

Architecture

flowchart TD
    CLI["__main__.py\n(Click CLI)"] --> ScannerM["scanner.py\nFile discovery"]
    ScannerM --> Parser["parser.py\nTree-sitter parsing"]
    Parser --> Extractor["extractor.py\nFragment extraction\n(functions · classes · files)"]
    Extractor --> Normalizer["normalizer.py\nRegex tokeniser\nType-2 normalisation"]
    Normalizer --> Fingerprint["fingerprint.py\nSHA-256 hashing"]
    Fingerprint --> DB["db.py\nSQLite session store"]
    DB --> Detector["detector.py\nType-1 / 2 hash grouping\nType-3 Jaccard similarity"]
    Detector --> DB
    DB --> JSON["reporter/json_reporter.py\nJSON report"]
    DB --> HTML["reporter/html_reporter.py\nHTML report"]
    DB -->|delete session| Cleanup["Session cleanup"]

Loading

Format and Lint

poetry run black codeecho
poetry run pylint codeecho

Run Tests with Coverage

poetry run pytest --cov=codeecho tests --cov-report html

Changelog

License

This project is licensed under the MIT License.

Author

Ron Webb