frslint

Linter for FreeSWITCH XML configuration files. Checks code style, finds common errors, and can auto-fix most issues. Able to run debug mode to follow the evalution steps in your freeswitch to follow where what is happen in your configuration.

About

This project is a hobby project. As I am tasked with maintaining some freeswitch systems and the freeswitch ecosystem was lacking any static analysis / debugging tools. It is not perfect, the code has its faults, not every case is covered yet, but I would like to continue improving this over time. Feel free to submit wishes / bug reports, so this tool can grow into something bigger.

Installation

pip install frslint

Or install from source:

git clone https://github.com/zimmer-yan/frslint
cd frslint
pip install -e .

Usage

Lint (code style)

Check for style issues:

frslint lint /etc/freeswitch/freeswitch.xml

Auto-fix what can be fixed:

frslint lint /etc/freeswitch/freeswitch.xml --fix

Options:

--fix                 Auto-fix fixable issues
--indent-size N       Expected indent size (default: 2)
--max-line-length N   Max line length (default: 120)
--max-blank-lines N   Max consecutive blank lines (default: 2)
--allow-tabs          Allow tabs instead of spaces
-f, --format json     Output json formatted
-v, --verbose         Verbose output

Analyze (static analysis)

Check for errors like undefined variables, invalid regex, etc:

frslint analyze /etc/freeswitch/freeswitch.xml

Options:

-f, --format json     Output json formatted
-v, --verbose         Verbose output

Debug

Trace dialplan execution for a given destination number:

frslint debug /etc/freeswitch/freeswitch.xml 1234
frslint debug /etc/freeswitch/freeswitch.xml 1234 -c public

Options:

-n, --network-addr      Network address of the caller
-c, --context-name      Name of the context to run (default: public)
-v, --verbose           Verbose output

What it checks

Lint:

• Trailing whitespace
• Tabs vs spaces
• Indentation depth
• Consecutive blank lines
• Missing newline at EOF
• Line length
• Mixed line endings (CRLF/LF)

Analyze:

• Undefined channel variables
• Invalid regex patterns
• Missing required attributes
• Unknown applications

Exit codes

• 0 - No issues found
• 1 - Issues found (or unfixed issues when using --fix)