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10.2.1 Buffer Local Minor Modes

• ‘Abbrev’ mode automatically expands text based on pre-defined abbreviation definitions. See Abbrevs.
• ‘Auto Fill’ mode inserts newlines as you type to prevent lines from becoming too long. See Filling.
• ‘Auto Save’ mode saves the buffer contents periodically to reduce the amount of work you can lose in case of a crash. See Auto Save.
• ‘Electric Quote’ mode automatically converts quotation marks. For example, it requotes text typed ‘like this’ to text ‘like this’. You can control what kind of text it operates in, and you can disable it entirely in individual buffers. See Quotation Marks.
• ‘Enriched’ mode enables editing and saving of formatted text. See Enriched Text.
• ‘Flyspell’ mode automatically highlights misspelled words. See Spelling.
• ‘Font-Lock’ mode automatically highlights certain textual units found in programs. It is enabled globally by default, but you can disable it in individual buffers. See Faces.
• ‘Display Line Numbers’ mode is a convenience wrapper around display-line-numbers, setting it using the value of display-line-numbers-type. See Display Custom.
• ‘Outline minor’ mode provides similar facilities to the major mode called ‘Outline’ mode. See Outline Mode.
• ‘Overwrite’ mode causes ordinary printing characters to replace existing text instead of shoving it to the right. For example, if point is in front of the ‘B’ in ‘FOOBAR’, then in Overwrite mode typing a G changes it to ‘FOOGAR’, instead of producing ‘FOOGBAR’ as usual. In ‘Overwrite’ mode, the command ‘C-q’ inserts the next character whatever it may be, even if it is a digit—this gives you a way to insert a character instead of replacing an existing character. The mode command, overwrite-mode, is bound to the Insert key.
• ‘Binary Overwrite’ mode is a variant of ‘Overwrite’ mode for editing binary files; it treats newlines and tabs like other characters, so that they overwrite other characters and can be overwritten by them. In ‘Binary Overwrite’ mode, digits after ‘C-q’ specify an octal character code, as usual.
• ‘Visual Line’ mode performs word wrapping, causing long lines to be wrapped at word boundaries. See Visual Line Mode.