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SQLite’s Use of Tcl (2017)
a TCL extension that has escaped into the wild. The design of SQLite was inspired by the design of TCL, both in the way it handles datatypes and in the formatting of its source code.
The mksqlite3.tcl script automatically adds the "static" keyword to internal SQLite APIs to give them file linkage, and makes other similar edits. The added TCL code is used for advanced formatting techniques, for automatically creating cross-references and cross-links, and for constructing complex displays such as the popular "rail-road" syntax diagrams for SQL. The Fossil version control system used for the SQLite source code (and written specifically for that purpose) uses Tcl/Tk to show graphical side-by-side diffs in a separate window.
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