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-*usr_50.txt* For Vim version 8.2. Last change: 2022 May 13
+*usr_50.txt* For Vim version 8.2. Last change: 2022 Jun 03
VIM USER MANUAL - by Bram Moolenaar
Advanced Vim script writing
-TODO - this chapter is to be written
-
-|50.1| Writing stuff
+|50.1| Line continuation
+|50.2| Restoring the view
Next chapter: |usr_51.txt| Create a plugin
Previous chapter: |usr_45.txt| Select your language (local)
Table of contents: |usr_toc.txt|
==============================================================================
-*50.1* Writing stuff
+*50.1* Line continuation
-TODO
+In legacy Vim script line contination is done by preceding a contination line
+with a backslash: >
+ let mylist = [
+ \ 'one',
+ \ 'two',
+ \ ]
+
+This requires the 'cpo' option to exclude the "C" flag. Normally this is done
+by putting this at the start of the script: >
+ let s:save_cpo = &cpo
+ set cpo&vim
+
+And restore the option at the end of the script: >
+ let &cpo = s:save_cpo
+ unlet s:save_cpo
+
+A few more details can be found here: |line-continuation|.
+
+In |Vim9| script the backslash can still be used, but in most places it is not
+needed: >
+ var mylist = [
+ 'one',
+ 'two',
+ ]
+
+Also, the 'cpo' option does not need to be changed. See
+|vim9-line-continuation| for details.
+
+==============================================================================
+*50.2* Restoring the view
+
+Sometimes you want to make a change and go back to where the cursor was.
+Restoring the relative position would also be nice, so that the same line
+appears at the top of the window.
+
+This example yanks the current line, puts it above the first line in the file
+and then restores the view: >
+
+ map ,p ma"aYHmbgg"aP`bzt`a
+
+What this does: >
+ ma"aYHmbgg"aP`bzt`a
+< ma set mark a at cursor position
+ "aY yank current line into register a
+ Hmb go to top line in window and set mark b there
+ gg go to first line in file
+ "aP put the yanked line above it
+ `b go back to top line in display
+ zt position the text in the window as before
+ `a go back to saved cursor position
+
==============================================================================