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cj/json-format-buffer, cj/yaml-format-buffer, and cj/webdev-format-buffer ran their formatters through shell-command-on-region, which goes via a shell. I moved each to call-process-region with an explicit program and argv list, so a filename or buffer content can't be word-split or read as shell syntax. The webdev path dropped its shell-quote-argument dance once the filename became a plain argv element.
Point preservation is unchanged. One deliberate improvement, and it's tested: shell-command-on-region with replace replaced the buffer with the formatter's error text on a non-zero exit. The new per-formatter helper captures output to a temp buffer, checks the exit code, replaces only on success, and otherwise raises a user-error carrying stderr — so a failed format leaves the buffer alone.
I kept a small format-region helper in each of the three modules rather than one shared helper. They have no common module to live in short of system-lib, and coupling three unrelated domain modules through it wasn't worth saving sixteen lines.
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