TeX, Metafont, and MetaPost all (by default) stop and ask for user intervention at an error. If the user responds with e or E, the program invokes an editor.
Specifying `--with-editor=cmd' to configure sets the
default editor command string to cmd. The environment
variables/configuration values TEXEDIT, MFEDIT, and
MPEDIT (respectively) override this. If `--with-editor' is
not specified, the default is vi +%d %s.
In this string, `%d' is replaced by the line number of the error, and `%s' is replaced by the name of the current input file.
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