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hpost: support custom headers (thanks julienxx)

hget supports adding custom headers with -r;
it makes sense for hpost to do the same, both
because custom headers are more likely necessary
with POSTs, and for consistency.

--- a/rc/bin/hpost

+++ b/rc/bin/hpost

@@ -1,12 +1,15 @@

 #!/bin/rc

 rfork e

 url=()

+headers=()

+action=()

+method=()

 at=()	# text fields

 af=()	# file fields

 l=()

 fn usage {

-	echo 'usage: hpost [ -l ] [ -[gpm] action ] [ -u ] url [ field:value | field@file ... ]' >[1=2]

+	echo 'usage: hpost [ -l ] [ -[gpm] action ] [ -r ] header [ -u ] url [ field:value | field@file ... ]' >[1=2]

 	exit usage

 }

@@ -14,6 +17,7 @@

 	switch($1){

 	case -l;	l=($l $1)

 	case -u;	shift; url=$1

+	case -r;	shift; headers=($headers -r $1)

 	case -g;	shift; action=$1; method=mget

 	case -p;	shift; action=$1; method=mpost

 	case -m;	shift; action=$1; method=multi

@@ -94,8 +98,9 @@

 	menc $"f | $hget -r 'Content-Type: multipart/form-data; boundary='$"f -b $url -P $action

 }

+

 if(! ~ $action ''){

-	hget=(hget $l)

+	hget=(hget $headers $l)

 	$method

 	exit

 }

--- a/sys/man/1/hget

+++ b/sys/man/1/hget

@@ -38,6 +38,9 @@

 .B -m

 .I action

 ] [

+.B -r

+.I header

+] [

 .B -u

 ]

 .I url

@@ -119,6 +122,9 @@

 .B -r

 sends an arbitrary HTTP

 .IR header .

+The

+.B -r

+flag can be repeated to send multiple headers.

 .PP

 Option

 .B -m