9diff, adiff, basediff - new commands for diffing with sources/9atom

Reference: /n/atom/patch/applied2013/basediff
Date: Thu Sep 12 17:11:49 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/man/1/9diff	Thu Jan  1 00:00:00 1970
+++ /sys/man/1/9diff	Thu Sep 12 17:11:17 2013
@@ -0,0 +1,66 @@
+.TH 9diff 1
+.SH NAME
+9diff, adiff, basediff \- diff with remote trees
+.SH SYNOPSIS
+.B 9diff
+.I file
+...
+.br
+.B adiff
+.I file
+...
+.br
+.BI t= 9fsname
+.BI b= boundname
+.B basediff
+[
+.I diff-flags
+]
+.SH DESCRIPTION
+.I Basediff
+provides a template for recursively running
+.IR diff (1)
+against
+the remote tree specified through environment variables.
+The
+.I 9fs
+(see
+.IR srv (4))
+name for the remote tree is specified with
+.BR $t ,
+and its mount point with
+.BR $b .
+If the remote is not mounted, 
+.I basediff
+will mount it.
+.I Diff
+is then run recursively with the specified flags (default
+.BR -c )
+on the specified trees against the
+corresponding remote files.
+.P
+The scripts
+.I 9diff
+and
+.I adiff
+are scripts that use
+.I basediff
+with remote trees of
+.B sources
+and
+.BR 9atom ,
+respectively.
+.SH EXAMPLES
+To diff the kernel's IP stack with sources,
+.IP
+.EX
+9diff /sys/src/9/ip
+.EE
+.SH "SEE ALSO"
+.IR diff (1),
+.IR srv (4)
+.SH BUGS
+.I Adiff
+conflicts with the
+.IR acme (1)
+program of the same name.
--- /rc/bin/basediff	Thu Jan  1 00:00:00 1970
+++ /rc/bin/basediff	Thu Sep 12 17:11:18 2013
@@ -0,0 +1,22 @@
+#!/bin/rc
+if(! test -d $b/386)
+	9fs $t
+ptflagfmt='a,b,c,e,f,m,n,r,w'
+args='...'
+if(! ifs=() eval `{aux/getflags $*}){
+	aux/usage
+	exit usage
+}
+if(~ $ptflag '')
+	ptflag = -c
+p = `{pwd | sed s:.*/sys/src/:/sys/src/:g}
+for(i){
+	if(~ $i /*)
+		diff $ptflag $b$i $i
+	if not{
+		if(test -d $i)
+			basediff $ptflag $i/*
+		if not
+			diff $ptflag $b$p/$i $i
+	}
+}
--- /rc/bin/9diff	Thu Jan  1 00:00:00 1970
+++ /rc/bin/9diff	Thu Sep 12 17:11:18 2013
@@ -0,0 +1,2 @@
+#!/bin/rc
+t=sources b=/n/$t/plan9 basediff $*
--- /rc/bin/adiff	Thu Jan  1 00:00:00 1970
+++ /rc/bin/adiff	Thu Sep 12 17:11:19 2013
@@ -0,0 +1,2 @@
+#!/bin/rc
+t=atom b=/n/$t/plan9 basediff $*