[bug#44460] [PATCH] processes: Optionally normalize recutils output.

[John Soo]

Hi Guix,

Please let me know if there is already a way to do what I want without
this patch :). I really don't know a whole lot of recutils beyond what I
learned this morning.

I was trying to extract PIDs of the child processes of sessions from the
output of guix processes.  I ran into the following problem: the PID and
the command are on the same line.

---- Begin ----
$ guix processes
SessionPID: 4278
ClientPID: 4268
ClientCommand: /gnu/store/...
ChildProcess: 4435: /gnu/store/...
ChildProcess: 4554: /gnu/store/...
ChildProcess: 4646: guile --no-auto-compile ...
---- End ----

I ended up having to use sed to remove the trailing command for the
child process.  After reading the documentation for recutils I found out
that records can also be expressed in separate record sets that can be
joined together. 

This patch adds a --normalize flag that specifies the
recutils output be put in separate record sets for Locks, Sessions, and
ChildProcesses.  For example:

---- Begin ----
PAGER=cat ./pre-inst-env guix processes --normalize
%rec: Session
%type: PID int
%type: ClientPID int
%key: PID

PID: 4278
ClientPID: 4268
ClientCommand: /gnu/store/...

%rec: Lock
%type: Session rec Session

%rec: ChildProcess
%type: Session rec Session
%type: PID int
%key: PID

Session: 4278
PID: 4435
Command: /gnu/store/...

Session: 4278
PID: 4554
Command: /gnu/store/...

Session: 4278
PID: 4646
Command: guile --no-auto-compile ...

---- End ----

What do you think?

John

0001-processes-Optionally-normalize-recutils-output.patch
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