vim 向后搜索并在匹配的模式之前替换

Question

I'm enjoying vim, and its powerful search and replace command. However, I need to perform a complex research and substitute, like this one:

1) find the first occurrence of "field.h" and delete the line 2) from the deleted line search backwards up to a line containing "foo.h" (this search has to be case insensitive), and put a new line just before it containing "include 'io.h'"

3) repeat this operation for every occurrance of "field.h" in the file

Now, I know how to delete all the lines in a file matching a pattern, and how to insert a new line before a pattern, but I don't knonw how to all of this combined.

For point 1 above, I would do :g/field.h/d , while for point 2 something like :g/"foo.h"/s/#include "io.h"\\r&/g should work...

As an example, the starting file could be:

"foo.h"

lines of text, they can be also empty lines
#include "field.h"
other text

and the resulting file should be:

#include "io.h"
"foo.h"

lines of text, they can be also empty lines
other text

Some can help me? Thanks

Answer 1

:g/\c"field.h"/d | ?"foo.h"?norm! O#include "io.h"

should work. Transforms

"foo.h"

lines of text, they can be also empty lines
#include "field.h"
other text

"foo.h"

#include "FIELD.h"

into

#include "io.h"
"foo.h"

lines of text, they can be also empty lines
other text

#include "io.h"
"foo.h"

Breaking it down:

• :g/\\c"foo.h"/ : for all lines matching "foo.h" ( \\c for case-insentivity)
• d : delete
• | : chain with another command
• ?"foo.h"? : backward search for the previous "foo.h"
• norm! : run the following input as in normal mode ( ! to remove all mappings, you might not need/want this)
• O : Enter insert mode on the line above (do not use a - modifier to the search, it would fail to go above the first line)
• #include "io.h" : write #include "io.h"