Filling involves re-formatting text so that each line extends as far to the right as possible without any words being broken or any text extending past the fill-column.
The first section deals with general commands used to fill text, while the second section provides information on Auto-Fill mode and related commands.
Arguments: None
Key sequence: Alt+Q
Fills the current paragraph. If the current point is located between two paragraphs, the next paragraph is filled.
A prefix argument causes the current fill operation to use that value, rather than the value of fill-column.
Arguments: None
Key sequence: Alt+G
Fills the region from the current point to the mark.
A prefix argument causes the current fill operation to use that value, rather than the value of fill-column.
Default value: 70
Determines the column at which text in the current buffer is forced on to a new line when filling text.
Set Fill Column Editor Command
Arguments: None
Key sequence: Ctrl+X F
Sets the value of fill-column, for the current buffer, as the column of the current point.
A prefix argument causes fill-column to be set at the required value.
Default value: nil
Defines a string which is excluded when each line of the current buffer is re-formatted using the filling commands. For example, if the value is ";;", then these characters at the start of a line are skipped over when the text is re-formatted. This allows you to re-format (fill) Lisp comments. If the value is nil, no characters are excluded when text is filled.
If the vales is non-nil, any line that does not begin with the value is considered to begin a new paragraph. Therefore, any re-formatting of comments in Lisp code does not intrude outside the commented lines.
Set Fill Prefix Editor Command
Arguments: None
Key sequence: Ctrl+X .
Sets the fill-prefix of the current buffer to be the text from the beginning of the current line up to the current point. The fill-prefix may be set to nil by using this command with the current point at the start of a line.
Arguments: None
Key sequence: None
Centers the current line with reference to the current value of fill-column.
A prefix argument causes the current line to be centered with reference to the required width.
By default no filling of text takes place unless specified by using one of the commands described above. A result of this is that the user has to press Return at the end of each line typed to simulate filling. In Auto-Fill mode lines are broken between words at the right margin automatically as the text is being typed. Each line is broken when a space is inserted, and the text that extends past the right margin is put on the next line. The right hand margin is determined by the editor variable fill-column.
Arguments: None
Key sequence: None
Switches auto-fill mode on if it is currently off, and off if it is currently on.
With a positive prefix argument, auto-fill mode is switched on. With a negative or zero prefix argument, it is switched off. Using prefix arguments with Auto Fill Mode disregards the current state of the mode.
Auto Fill Space Editor Command
Arguments: None
Key sequence: Space
Mode: Auto-Fill
Inserts a space and breaks the line between two words if the line extends beyond the right margin. A fill prefix is automatically added at the beginning of the new line if the value of fill-prefix is non-nil.
When Space is bound to this command in Auto-Fill mode, this key no longer invokes Self Insert.
A positive prefix argument causes the required number of spaces to be inserted but no line break. A prefix argument of zero causes a line break, if necessary, but no spaces are inserted.
Auto Fill Linefeed Editor Command
Arguments: None
Key sequence: Linefeed
Mode: Auto-Fill
Inserts a Linefeed and a fill-prefix (if one exists).
Auto Fill Return Editor Command
Arguments: None
Key sequence: Return
Mode: Auto-Fill
The current line is broken, between two words if necessary, with no Space being inserted. This is equivalent to Auto Fill Space with a zero prefix argument, but followed by a newline.
auto-fill-space-indent Editor Variable
Default value: nil
When true, Auto-fill commands use Indent New Comment Line to break lines instead of New Line.
Editor User Guide (Windows version) - 01 Dec 2021 19:35:26