The thing is I have printed something in the terminal, but when I accidentally resize the terminal, the printed contents at the bottom of my terminal disappear. Why is that? Is there anyway to recover these printed messages since the program runs a long time each time.
When you resize a terminal window, the terminal has to paint or repaint part of the window. If you lost text at the bottom of the window, that sounds as if you shrank the window when using one of the terminals which leave the upper-left corner of the window in a fixed position, while adjusting the rest of the window. Offhand, that could be rxvt, putty, konsole. xterm (which is configurable) defaults to the other direction.
If the window shrinks, then the location of the "bottom" row of text should be moved up (to match user's expectations). But there is a complication: GNU screen will besides redrawing the window, attempt to wrap long lines so that they fit the new margins. Developers for a few terminals have imitated that in the past few years, and you may notice some bug reports when that new feature does not work well.
For instance, if you shrank the window vertically, but changed its width, then a miscalculation of the wrapped lines could cause text to vanish. Then again, resizing it again might get the text back into view. But if that does not work, then it's gone.
Related
In the Alternate Screen Buffer mode in XTerm-like terminal emulators, when the cursor is on the last row and the terminal window is resized so that it has less rows, all text in the terminal is shifted upwards.
Can anyone point me to what is going on here? I can't find any related escape sequences to turn this behavior off, or any way to intercept SIGWINCH to move the cursor before the shift happens. It seems like it may be related to scrolling to keep the cursor on the screen.
I'd really like the screen display to not change, even if the cursor is no longer on screen after a resize.
I'm not using ncurses or other libraries, just escape sequences and system calls.
I can't get emacs to scroll horizontally!
To replicate the problem:
Open the *scratch* buffer.
Write a long line.
Make the long line exceed the window width with M-xtoggle-truncate-lines. The left hand text (column 0) will now be off the left of the window.
Try M-xscroll-left or its shortcut C-x < to scroll left.
Type y to enable the disabled commands.
NOTHING HAPPENS!
I also tried C-a to go to the beginning of the line.
I also tried M-xtoggle-horizontal-scroll-bar but got the error message "Horizontal scroll bars aren't implemented yet".
There seems to be no way to scroll horizontally!
I need this because I have many wide CSV files to read.
I'm using the latest prelude on emacs 24.5 on Windows 10.
I filed an issue on the prelude project in case it is a genuine bug and could be fixed there.
You seem not to understand how horizontal scrolling works. It's not intuitive, that's why the command is disabled by default.
When I press C-x< at the end of the long line, the line disappears to the left. When I press C-x> there, nothing happens.
Pressing C-x< at the beginning of the long line, though, shows the second part of the long line.
Consider using visual-line-mode or even the csv-mode instead.
There is new a feature in Emacs 26. You can customize mwheel-tilt-scroll-p and use mouse to scroll.
M-x customize group RET mouse
Then set mwheel-tilt-scroll-p to t
No need to handroll it yourself. This is provided out of the box in emacs 27, and it probably was available for longer:
This feature is off by default; the variable mouse-wheel-tilt-scroll turns it on, if you customize it to a non-nil value.
(setq mouse-wheel-tilt-scroll t)
Sounds like xemacs have horizontal scroll in a 'natural' way.
As far as I can see it there is a [Options] button in the menubar, when clicking on it there is a [Frame Appearance] sub menu and there, there are 2 button []scrollbars, [] Truncate Lines
When these 2 buttons are checked in, long line are truncated and scrolling is smooth.
May be xemacs is non standard though.
I use it, I find it easy to cut/paste even rectangular areas, selection is faster and more precise to me that what I could achieve with keyboard meta-ctrl-shift stroke alone.
Cheers
Phi
I
I use OSX and prefer a dark BG and light text in my terminal. A problem is that the mouse pointer is almost invisible. Its the I shaped pointer, its black with an extremely faint white glow. I often can't see where the pointer is.
If the terminal does not have focus and I'm hovering the mouse pointer over the terminal window I can see it fine. But once the terminal has focus the pointer practically disappears.
Please note, I'm asking about the mouse pointer not the terminal keyboard cursor, which is easily customisable.
Holding down the alt key on Mac OSX changes the cursor to a black cross that has a white border which makes it far easier to spot than the default text bar.
A better term to look for is "mouse pointer". Here are some places where it has been discussed:
Change default mouse cursor on OSX Mavericks
Can I make the mouse hairpin in the terminal more visible?
Terminal app mouse-pointer invisible
More than one solution is suggested, including add-ons (which you may or may not find useful).
Following the links in Thomas Dickey's answer, I saw many references to iTerm2.
While this won't be the solution for everyone, it's definitely worth a try - GPL2, easy to install and configure.
Out of the box, no contrast issues with the text cursor or mouse pointer against a black background. I just adjusted font size and switched on window borders.
I have gnuscreen on with multiple "tabs" open. Emacs is on tab 0.
When I tab to a different screen and return to Emacs, the lines do not wrap properly anymore. They blend into each other. If I have a vertical split open in Emacs, the two views blend into each other as if the bar in the middle fails to constrain the line wraps.
How do I prevent this? This is in Terminal.app and the only solution I've found is to force a redraw by dragging the corner slightly. That's not a good long term solution.
I've got emacs in front of me.
I've run a find-grep, and it's got many hits, which are displayed in a window. The file names are displayed in green as hyperlinks.
I make that the only window, with C-x 1.
If I click on a file name, the window splits vertically, and the file with the found text is displayed in the other window.
If I click on further filenames, then the new file replaces the old file, which is what I want to happen.
So far, so good...
However if I resize the windows, then emacs will periodically (when I click) split one of the two windows again, rendering the display difficult to read. It will then cycle opening new files between the two new windows. Occasionally it will open more windows and make the situation worse. If I close any of these new windows they just get reopened again.
In fact sometimes this perverse behaviour happens even if I don't resize anything. It just seems to happen more often if I do.
I would like emacs to stop buggering around and just have one find-grep window and one 'display' window, and always replace the display window with the new file. I would also like to be able to set these windows to the sizes that seem most convenient.
Is there any way to achieve this?
Or can anyone point me to an essay on how the whole (replace the contents of this window/replace the contents of a different window/create another window by splitting) thing works, so I can go and hack it sane.
Short fix:
Try doing this
(setq split-height-threshold nil
split-width-threshold nil)
This will prevent Emacs from splitting windows automatically (horizontally or vertically). This might be undesirable in other situations, but this should do the job. Try it for a week or so and see if it disrupts your flow.
Also, I found that if the point was in one of the windows, and I clicked on a link, the file opened up in the next window (if any).
So, if you want to make the file open in the right window (when you have more than one window), you can ensure that the point is in the window before the window you want.
Longer answer:
OK. I was able to reproduce the problem. The thing is the window showing the files is pretty big (wide or tall) because you resized it and Emacs sees that the width or height is greater than the respective threshold and splits it likewise. So, we have to either make the threshold higher or disallow the behaviour completely.
And, just to answer the last few questions:
To get current window - (selected-window)
To get next window - (next-window)
To select a window - (select-window foo-window)
To get the buffer of the current window - (current-buffer)
To get the buffer of some window - (window-buffer foo-window)
To set a buffer for a window - (set-window-buffer foo-window bar-buffer)
I'm sure you can hack together decent window/buffer management functions using these functions.
You can use C-h f to get more details on each of these functions.
Also check out the Elisp manual - http://www.chemie.fu-berlin.de/chemnet/use/info/elisp/elisp_26.html