Added X, Y, and Z.

Resolves #304.

README.md

@@ -220,6 +220,7 @@ A list of [known ITS machines](doc/machines.md).
    - UPTIME, Chaosnet uptime server.
    - WHAT, humorous quips to various "what" questions.
    - WHO%, list index/uname/jname/%time in sorted list.
+   - X, Y, Z, remember DDT command and re-execute it.
 
 6. A brand new host table is built from the host table source and
    installed into SYSBIN; HOSTS3 > using H3MAKE.

build/build.tcl

@@ -996,6 +996,12 @@ respond "*" ":midas sys2;ts gmsgs_sysen1;gmsgs\r"
 expect ":KILL"
 respond "*" ":link dragon;daily expire,sys2;ts gmsgs\r"
 
+# X, Y, Z
+respond "*" ":midas sys1;ts x_sysen2;x\r"
+expect ":KILL"
+respond "*" ":link sys1;ts y,sys1;ts x\r"
+respond "*" ":link sys1;ts z,sys1;ts x\r"
+
 # LOADP
 respond "*" ":midas sys2;ts loadp_sysen1;loadp\r"
 expect ":KILL"

doc/_info_/x.info

@@ -0,0 +1,8 @@
+úSi a1/10/76  THE PROGRAM X REMEMBERS A DDT COMMAND FORôgÕ]
+PREFIX A LINE OF DDT COMMANDS WITH ":X " TO EXECUTE THEM
+AND SET :X'S MEMORY.  FROM THEN ON, JUST PLAIN ":X<CR>"
+WILL RE-EXECUTE THEM.  Y AND XM ALSO EXIST, AND EACH REMEMBERS
+ITS OWN COMMAND LINE. MORE CAN BE CREATED BY LINKING TO
+SYS;TS X (FROM YOUR OWN DIRECTORY OR FROM SYS1;).
+THE MEMORY IS ONô$Ó—õˆ$ÎAø(#I™E WHOSE FIRST Nø3b “S
+_Xôé ¿Y OR _XM OR WHATEVER, AND WHOSE SECOND NAME IS YOUR UNAME.

src/sysen2/x.9

@@ -0,0 +1,83 @@
+
+;-*-MIDAS-*-
+
+TITLE X 	;REMEMBER AND RE-EXECUTE A COMMAND STRING.
+
+.INSRT RMS;MACROS >
+
+TYOC==1
+DSKC==2
+
+IFNDEF CMDBFL,CMDBFL==1000.
+
+BEG:	.SUSET [.RXUNAM,,XUNAME]
+	.SUSET [.RHSNAM,,HSNAME]
+	.SUSET [.RXJNAM,,B]
+	LSH B,-6
+	TLO B,(SIXBIT/_/)
+	.SUSET [.ROPTIO,,A]
+	TLNN A,OPTCMD
+	 JRST NOJCL
+	.BREAK 12,[5,,CMDBUF]
+	SYSCAL OPEN,[[.BAO,,DSKC] ? ['DSK,,] ? XUNAME ? B ? HSNAME]
+	 JRST NODSK
+	SKIPN CMDBUF
+	 JRST NOJCL
+	MOVE A,[440700,,CMDBUF]
+LOOP:	ILDB C,A
+	CAIN C,^C
+	 JRST NOLOOP
+	JUMPE C,NOLOOP
+	CAIE C,^M	;FIND THE CR ENDING THE JCL
+	 JRST LOOP
+	MOVEI C,^J	;AND PUT A LF AFTER IT.
+	IDPB C,A
+NOLOOP:	SETZ A,
+	SKIPE CMDBUF(A)
+	 AOJA A,.-1
+	MOVNS A
+	HRLZS A
+	HRRI A,CMDBUF
+	.IOT DSKC,A
+NOJCL:	SYSCAL OPEN,[[.BAI,,DSKC] ? ['DSK,,] ? XUNAME ? B ? HSNAME]
+	 JRST NOFILE
+	MOVE A,[-CMDBFL,,CMDBUF]
+	.IOT DSKC,A
+	SETZM (A)
+	SUBI A,1		;FLUSH CONTROL-C'S AT EOF
+	HRLI A,010700
+FLSCTC:	LDB B,A
+	CAIE B,^C
+	 JRST FLSCTX
+	MOVEI B,0
+	DPB B,A
+	ADD A,[070000,,]
+	JUMPGE A,FLSCTC
+FLSCTX:	.VALUE VALCOM
+
+NODSK:	MOVEI A,[ASCIZ/CAN'T WRITE DISK FILE/]
+	JRST NO
+
+NOFILE:	MOVEI A,[ASCIZ/CAN'T READ DISK FILE/]
+	JRST NO
+
+NO:	SYSCAL OPEN,[[.UAO,,TYOC] ? ['TTY,,]]
+	 .VALUE
+	HRLI A,440700
+NO1:	ILDB B,A
+	JUMPE B,KILL
+	.IOT TYOC,B
+	JRST NO1
+
+KILL:	DPAUSE
+	.BREAK 16,40000
+
+VALCOM:	ASCII/:KILL   /
+CMDBUF:	BLOCK CMDBFL
+	-1
+
+XUNAME:	0		;USER'S XUNAME
+HSNAME:	0		;USER'S HOME DIRECTORY.
+DEBUG:	-1		;-1 IF DEBUGGING.
+
+END BEG