Description

The first line of a block begins with `#' followed by a space and a tag, which implies the end of the preceding block.

Raw Input

Desired Output

#100
ADD some/file/path
MODIFY diff/file/path
#104
MODIFY /another/modified/file/path
DEL /a/deleted/file/path
MODIFY /one/more/file/path

100 ADD some/file/path
100 MODIFY diff/file/path
104 MODIFY /another/modified/file/path
104 DEL /a/deleted/file/path
104 MODIFY /one/more/file/path

Script and Comments

Script₁

[ 1] /^# /{
[ 2] h
[ 3] d
[ 4] }
[ 5] G
[ 6] s/^(.*)\n# (.*)/\2 \1/

Comments

The `-r' option of GNU sed must be used or you have to escape every parenthesis used in Step [6].
When the first line of a block is met, Steps [1] thru [4] are used to
- keep that line to the Hold Space via command `h' of Step [2]),
- then delete via Step [3] to start another cycle.
For the rest lines of a block:
- Command `G' of Step [5] appends the tag line from the Hold Space,
- and Step [6] does the remaining job.