Source-inspector

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- Update link references of ownership from nexB to aboutcode-org

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- Update README with Pygments and Tree-Sitter example by keshav-space in https://github.com/aboutcode-org/source-inspector/issues/22
- Pin tree-sitter dependencies by keshav-space in https://github.com/aboutcode-org/source-inspector/issues/23

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- Add support to collect strings, comments and symbols from source using Pygments
- Add support to collect strings and symbols from source using tree-sitter

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Improve xgettext handlings.
- Handle empty, whitespace and special characters. https://github.com/nexB/source-inspector/issues/11
- Properly handle the multiple starting lines for a string. https://github.com/nexB/source-inspector/issues/13
- Run xgettext with UTF-8 encoding. https://github.com/nexB/source-inspector/issues/14

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Add source strings collection using xgettext.
Ignore anonymous symbols in symbols_ctags.
Fix typo in package name.
Rename symbols output to source_symbols.

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Initial release with basic source symbols collection using Universal Ctags.

Also available as ScanCode Toolkit plugin.