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Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+*usr_12.txt*	For Vim version 9.0.  Last change: 2022 Nov 19
+
+		     VIM USER MANUAL - by Bram Moolenaar
+
+				Clever tricks
+
+
+By combining several commands you can make Vim do nearly everything.  In this
+chapter a number of useful combinations will be presented.  This uses the
+commands introduced in the previous chapters and a few more.
+
+|12.1|	Replace a word
+|12.2|	Change "Last, First" to "First Last"
+|12.3|	Sort a list
+|12.4|	Reverse line order
+|12.5|	Count words
+|12.6|	Find a man page
+|12.7|	Trim blanks
+|12.8|	Find where a word is used
+
+     Next chapter: |usr_20.txt|  Typing command-line commands quickly
+ Previous chapter: |usr_11.txt|  Recovering from a crash
+Table of contents: |usr_toc.txt|
+
+==============================================================================
+*12.1*	Replace a word
+
+The substitute command can be used to replace all occurrences of a word with
+another word: >
+
+	:%s/four/4/g
+
+The "%" range means to replace in all lines.  The "g" flag at the end causes
+all words in a line to be replaced.
+   This will not do the right thing if your file also contains "thirtyfour".
+It would be replaced with "thirty4".  To avoid this, use the "\<" item to
+match the start of a word: >
+
+	:%s/\<four/4/g
+
+Obviously, this still goes wrong on "fourteen".  Use "\>" to match the end of
+a word: >
+
+	:%s/\<four\>/4/g
+
+If you are programming, you might want to replace "four" in comments, but not
+in the code.  Since this is difficult to specify, add the "c" flag to have the
+substitute command prompt you for each replacement: >
+
+
+	:%s/\<four\>/4/gc
+
+
+REPLACING IN SEVERAL FILES
+
+Suppose you want to replace a word in more than one file.  You could edit each
+file and type the command manually.  It's a lot faster to use record and
+playback.
+   Let's assume you have a directory with C++ files, all ending in ".cpp".
+There is a function called "GetResp" that you want to rename to "GetAnswer".
+
+	vim *.cpp		Start Vim, defining the argument list to
+				contain all the C++ files.  You are now in the
+				first file.
+	qq			Start recording into the q register
+	:%s/\<GetResp\>/GetAnswer/g
+				Do the replacements in the first file.
+	:wnext			Write this file and move to the next one.
+	q			Stop recording.
+	@q			Execute the q register.  This will replay the
+				substitution and ":wnext".  You can verify
+				that this doesn't produce an error message.
+	999@q			Execute the q register on the remaining files.
+
+At the last file you will get an error message, because ":wnext" cannot move
+to the next file.  This stops the execution, and everything is done.
+
+	Note:
+	When playing back a recorded sequence, an error stops the execution.
+	Therefore, make sure you don't get an error message when recording.
+
+There is one catch: If one of the .cpp files does not contain the word
+"GetResp", you will get an error and replacing will stop.  To avoid this, add
+the "e" flag to the substitute command: >
+
+	:%s/\<GetResp\>/GetAnswer/ge
+
+The "e" flag tells ":substitute" that not finding a match is not an error.
+
+==============================================================================
+*12.2*	Change "Last, First" to "First Last"
+
+You have a list of names in this form:
+
+	Doe, John ~
+	Smith, Peter ~
+
+You want to change that to:
+
+	John Doe ~
+	Peter Smith ~
+
+This can be done with just one command: >
+
+	:%s/\([^,]*\), \(.*\)/\2 \1/
+
+Let's break this down in parts.  Obviously it starts with a substitute
+command.  The "%" is the line range, which stands for the whole file.  Thus
+the substitution is done in every line in the file.
+   The arguments for the substitute command are "/from/to/".  The slashes
+separate the "from" pattern and the "to" string.  This is what the "from"
+pattern contains:
+							\([^,]*\), \(.*\) ~
+
+	The first part between \( \) matches "Last"	\(     \)
+	    match anything but a comma			  [^,]
+	    any number of times				      *
+	matches ", " literally					 ,
+	The second part between \( \) matches "First"		   \(  \)
+	    any character					     .
+	    any number of times					      *
+
+In the "to" part we have "\2" and "\1".  These are called backreferences.
+They refer to the text matched by the "\( \)" parts in the pattern.  "\2"
+refers to the text matched by the second "\( \)", which is the "First" name.
+"\1" refers to the first "\( \)", which is the "Last" name.
+   You can use up to nine backreferences in the "to" part of a substitute
+command.  "\0" stands for the whole matched pattern.  There are a few more
+special items in a substitute command, see |sub-replace-special|.
+
+==============================================================================
+*12.3*	Sort a list
+
+In a Makefile you often have a list of files.  For example:
+
+	OBJS = \ ~
+		version.o \ ~
+		pch.o \ ~
+		getopt.o \ ~
+		util.o \ ~
+		getopt1.o \ ~
+		inp.o \ ~
+		patch.o \ ~
+		backup.o ~
+
+To sort this list, filter the text through the external sort command: >
+
+	/^OBJS
+	j
+	:.,/^$/-1!sort
+
+This goes to the first line, where "OBJS" is the first thing in the line.
+Then it goes one line down and filters the lines until the next empty line.
+You could also select the lines in Visual mode and then use "!sort".  That's
+easier to type, but more work when there are many lines.
+   The result is this:
+
+	OBJS = \ ~
+		backup.o ~
+		getopt.o \ ~
+		getopt1.o \ ~
+		inp.o \ ~
+		patch.o \ ~
+		pch.o \ ~
+		util.o \ ~
+		version.o \ ~
+
+
+Notice that a backslash at the end of each line is used to indicate the line
+continues.  After sorting, this is wrong!  The "backup.o" line that was at
+the end didn't have a backslash.  Now that it sorts to another place, it
+must have a backslash.
+   The simplest solution is to add the backslash with "A \<Esc>".  You can
+keep the backslash in the last line, if you make sure an empty line comes
+after it.  That way you don't have this problem again.
+
+==============================================================================
+*12.4*	Reverse line order
+
+The |:global| command can be combined with the |:move| command to move all the
+lines before the first line, resulting in a reversed file.  The command is: >
+
+	:global/^/move 0
+
+Abbreviated: >
+
+	:g/^/m 0
+
+The "^" regular expression matches the beginning of the line (even if the line
+is blank).  The |:move| command moves the matching line to after the imaginary
+zeroth line, so the current matching line becomes the first line of the file.
+As the |:global| command is not confused by the changing line numbering,
+|:global| proceeds to match all remaining lines of the file and puts each as
+the first.
+
+This also works on a range of lines.  First move to above the first line and
+mark it with "mt".  Then move the cursor to the last line in the range and
+type: >
+
+	:'t+1,.g/^/m 't
+
+==============================================================================
+*12.5*	Count words
+
+Sometimes you have to write a text with a maximum number of words.  Vim can
+count the words for you.
+   When the whole file is what you want to count the words in, use this
+command: >
+
+	g CTRL-G
+
+Do not type a space after the g, this is just used here to make the command
+easy to read.
+   The output looks like this:
+
+	Col 1 of 0; Line 141 of 157; Word 748 of 774; Byte 4489 of 4976 ~
+
+You can see on which word you are (748), and the total number of words in the
+file (774).
+
+When the text is only part of a file, you could move to the start of the text,
+type "g CTRL-G", move to the end of the text, type "g CTRL-G" again, and then
+use your brain to compute the difference in the word position.  That's a good
+exercise, but there is an easier way.  With Visual mode, select the text you
+want to count words in.  Then type g CTRL-G.  The result:
+
+	Selected 5 of 293 Lines; 70 of 1884 Words; 359 of 10928 Bytes ~
+
+For other ways to count words, lines and other items, see |count-items|.
+
+==============================================================================
+*12.6*	Find a man page					*find-manpage*
+
+While editing a shell script or C program, you are using a command or function
+that you want to find the man page for (this is on Unix).  Let's first use a
+simple way: Move the cursor to the word you want to find help on and press >
+
+	K
+
+Vim will run the external "man" program on the word.  If the man page is
+found, it is displayed.  This uses the normal pager to scroll through the text
+(mostly the "more" program).  When you get to the end pressing <Enter> will
+get you back into Vim.
+
+A disadvantage is that you can't see the man page and the text you are working
+on at the same time.  There is a trick to make the man page appear in a Vim
+window.  First, load the man filetype plugin: >
+
+	:runtime! ftplugin/man.vim
+
+Put this command in your vimrc file if you intend to do this often.  Now you
+can use the ":Man" command to open a window on a man page: >
+
+	:Man csh
+
+You can scroll around and the text is highlighted.  This allows you to find
+the help you were looking for.  Use CTRL-W w to jump to the window with the
+text you were working on.
+   To find a man page in a specific section, put the section number first.
+For example, to look in section 3 for "echo": >
+
+	:Man 3 echo
+
+To jump to another man page, which is in the text with the typical form
+"word(1)", press CTRL-] on it.  Further ":Man" commands will use the same
+window.
+
+To display a man page for the word under the cursor, use this: >
+
+	\K
+
+(If you redefined the <Leader>, use it instead of the backslash).
+For example, you want to know the return value of "strstr()" while editing
+this line:
+
+	if ( strstr (input, "aap") == ) ~
+
+Move the cursor to somewhere on "strstr" and type "\K".  A window will open
+to display the man page for strstr().
+
+==============================================================================
+*12.7*	Trim blanks
+
+Some people find spaces and tabs at the end of a line useless, wasteful, and
+ugly.  To remove whitespace at the end of every line, execute the following
+command: >
+
+	:%s/\s\+$//
+
+The line range "%" is used, thus this works on the whole file.  The pattern
+that the ":substitute" command matches with is "\s\+$".  This finds white
+space characters (\s), 1 or more of them (\+), before the end-of-line ($).
+Later will be explained how you write patterns like this, see |usr_27.txt|.
+   The "to" part of the substitute command is empty: "//".  Thus it replaces
+with nothing, effectively deleting the matched white space.
+
+Another wasteful use of spaces is placing them before a tab.  Often these can
+be deleted without changing the amount of white space.  But not always!
+Therefore, you can best do this manually.  Use this search command: >
+
+	/ 	
+
+You cannot see it, but there is a space before a tab in this command.  Thus
+it's "/<Space><Tab>".   Now use "x" to delete the space and check that the
+amount of white space doesn't change.  You might have to insert a tab if it
+does change.  Type "n" to find the next match.  Repeat this until no more
+matches can be found.
+
+==============================================================================
+*12.8*	Find where a word is used
+
+If you are a UNIX user, you can use a combination of Vim and the grep command
+to edit all the files that contain a given word.  This is extremely useful if
+you are working on a program and want to view or edit all the files that
+contain a specific variable.
+   For example, suppose you want to edit all the C program files that contain
+the word "frame_counter".  To do this you use the command: >
+
+	vim `grep -l frame_counter *.c`
+
+Let's look at this command in detail.  The grep command searches through a set
+of files for a given word.  Because the -l argument is specified, the command
+will only list the files containing the word and not print the matching lines.
+The word it is searching for is "frame_counter".  Actually, this can be any
+regular expression.  (Note: What grep uses for regular expressions is not
+exactly the same as what Vim uses.)
+   The entire command is enclosed in backticks (`).  This tells the UNIX shell
+to run this command and pretend that the results were typed on the command
+line.  So what happens is that the grep command is run and produces a list of
+files, these files are put on the Vim command line.  This results in Vim
+editing the file list that is the output of grep.  You can then use commands
+like ":next" and ":first" to browse through the files.
+
+
+FINDING EACH LINE
+
+The above command only finds the files in which the word is found.  You still
+have to find the word within the files.
+   Vim has a built-in command that you can use to search a set of files for a
+given string.  If you want to find all occurrences of "error_string" in all C
+program files, for example, enter the following command: >
+
+	:grep error_string *.c
+
+This causes Vim to search for the string "error_string" in all the specified
+files (*.c).  The editor will now open the first file where a match is found
+and position the cursor on the first matching line.  To go to the next
+matching line (no matter in what file it is), use the ":cnext" command.  To go
+to the previous match, use the ":cprev" command.  Use ":clist" to see all the
+matches and where they are.
+   The ":grep" command uses the external commands grep (on Unix) or findstr
+(on Windows).  You can change this by setting the option 'grepprg'.
+
+==============================================================================
+
+Next chapter: |usr_20.txt|  Typing command-line commands quickly
+
+Copyright: see |manual-copyright|  vim:tw=78:ts=8:noet:ft=help:norl: