cell: A terminal-based spreadsheet editor with Vim keybindings.

In the developer ecosystem, terminal-based tools are prized for their efficiency and low overhead. Cell enters this space by offering a deceptively complex capability: a functional, formula-aware spreadsheet editor. It moves beyond simple text manipulation, providing a structured environment where data integrity and computational logic are primary concerns. The standout feature of Cell is its deeply integrated user experience. By adopting Vim keybindings—from motion commands (h/j/k/l) to visual block selection and normal/insert modes—it achieves a minimal learning curve for developers already fluent in modal editing. This commitment to the terminal paradigm means that power users can manipulate grids and formulas without ever leaving their shell, which is a significant productivity win over GUI applications that force context switching. Technically, the architecture is sound, separating the core data model and formula engine (`cell-sheet-core`) from the terminal rendering layer (`cell-sheet-tui`). This modular design is crucial, indicating that the formula logic can be unit-tested and potentially ported to different frontends. Formula support is respectable, including standard functions like `SUM`, `AVERAGE`, and even nested `IF` statements, adhering to Excel-compatible syntax. The management of file formats is also thoughtful; while exporting standard CSV/TSV flattens formulas to computed values (a necessary limitation), the native `.cell` format is designed specifically to retain this computational state, which is key for maintaining data fidelity across sessions. Cell is not just a terminal spreadsheet; it's a data analysis utility built for the shell. Its ability to accept files directly from the command line (`cell data.csv`) and execute complex operations like sorting or saving structured data in a non-volatile format elevates it beyond a mere 'spreadsheet killer' into a genuine developer productivity tool. It suggests a future where local data processing and small-scale data modeling can happen entirely within the command line ecosystem, without needing to spawn an external GUI process.