How can I insert a line before each multiline range block and indent the blocks in gnu sed on windows? The files contain many code blocks of various length starting and ending with ```. Answers to many similar questions using a single line pattern don't use ranges. There are two similar questions: Insert line below text range with sed and sed: Appending after a block.
This code indents all code blocks as required:
sed '/```/,/```$/ s/\(.*\)/ \1/' test.md
I don't understand how to insert the === line before each code block but I understand grouping with {} is required to process the block after inserting the line. The questions above seem more complex requiring a buffer but this file should be able to be processed sequentially without a buffer.
I expect something like this attempt should work with the newline detail before the group:
sed '/```/,/```$/ {s/\(.*\)/ \1/}' test.md
test.md
a
b
```
c
d
e
```
f
g
Required
a
b
===
```
c
d
e
```
f
g
With GNU sed:
$ cat file
1
```
2
```
3
```
4
```
5
$ sed '/^```$/{ s/^/===\n /; :a; n; s/^/ /; /^ ```$/b; ba; }' file
1
===
```
2
```
3
===
```
4
```
5
(The cool sedsed can show how it works in details.)
With awk:
$ awk '/^```/ { if (!f) { print "===" } f++ } f { print " " $0 } f==2 { f=0; next } !f' file
1
===
```
2
```
3
===
```
4
```
5