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Text lines are portions of the buffer delimited by newline characters, which are regarded as part of the previous line. The first text line begins at the beginning of the buffer, and the last text line ends at the end of the buffer whether or not the last character is a newline. The division of the buffer into text lines is not affected by the width of the window, by line continuation in display, or by how tabs and control characters are displayed.
This function moves point to the front of the lineth line, counting
from line 1 at beginning of the buffer. If line is less than 1, it
moves point to the beginning of the buffer. If line is greater than
the number of lines in the buffer, it moves point to the end of the
buffer—that is, the end of the last line of the buffer. This is
the only case in which goto-line does not necessarily move to the
beginning of a line.
If narrowing is in effect, then line still counts from the beginning
of the buffer, but point cannot go outside the accessible portion. So
goto-line moves point to the beginning or end of the accessible
portion, if the line number specifies an inaccessible position.
The return value of goto-line is the difference between line
and the line number of the line to which point actually was able to move (in
the full buffer, before taking account of narrowing). Thus, the value is
positive if the scan encounters the real end of the buffer before finding
the specified line. The value is zero if scan encounters the end of the
accessible portion but not the real end of the buffer.
In an interactive call, line is the numeric prefix argument if one has been provided. Otherwise line is read in the minibuffer.
This function moves point to the beginning of the current line. With an
argument count not nil or 1, it moves forward
count-1 lines and then to the beginning of the line.
This function does not move point across a field boundary (voir la section Defining and Using Fields)
unless doing so would move beyond there to a different line; therefore, if
count is nil or 1, and point starts at a field boundary, point
does not move. To ignore field boundaries, either bind
inhibit-field-text-motion to t, or use the forward-line
function instead. For instance, (forward-line 0) does the same thing
as (beginning-of-line), except that it ignores field boundaries.
If this function reaches the end of the buffer (or of the accessible portion, if narrowing is in effect), it positions point there. No error is signaled.
Return the position that (beginning-of-line count) would move
to.
This function moves point to the end of the current line. With an argument
count not nil or 1, it moves forward count-1 lines
and then to the end of the line.
This function does not move point across a field boundary (voir la section Defining and Using Fields)
unless doing so would move beyond there to a different line; therefore, if
count is nil or 1, and point starts at a field boundary, point
does not move. To ignore field boundaries, bind
inhibit-field-text-motion to t.
If this function reaches the end of the buffer (or of the accessible portion, if narrowing is in effect), it positions point there. No error is signaled.
Return the position that (end-of-line count) would move to.
This function moves point forward count lines, to the beginning of the
line. If count is negative, it moves point -count lines
backward, to the beginning of a line. If count is zero, it moves
point to the beginning of the current line. If count is nil,
that means 1.
If forward-line encounters the beginning or end of the buffer (or of
the accessible portion) before finding that many lines, it sets point
there. No error is signaled.
forward-line returns the difference between count and the
number of lines actually moved. If you attempt to move down five lines from
the beginning of a buffer that has only three lines, point stops at the end
of the last line, and the value will be 2.
In an interactive call, count is the numeric prefix argument.
This function returns the number of lines between the positions start and end in the current buffer. If start and end are equal, then it returns 0. Otherwise it returns at least 1, even if start and end are on the same line. This is because the text between them, considered in isolation, must contain at least one line unless it is empty.
Here is an example of using count-lines:
(defun current-line ()
"Return the vertical position of point…"
(+ (count-lines (window-start) (point))
(if (= (current-column) 0) 1 0)))
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This function returns the line number in the current buffer corresponding to
the buffer position pos. If pos is nil or omitted, the
current buffer position is used.
Also see the functions bolp and eolp in Examining Text Near Point.
These functions do not move point, but test whether it is already at the
beginning or end of a line.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.