ltend: Fail more nicely when land unit isn't on tender

Land units not on the tender are silently ignored.  This may leave the
player guessing why the command did nothing.  Reporting them all would
be annoying; I just changed tend to report only explicitly named ones.
Make ltend behave the same.

This does add a related annoyance: ltend can complain "not on ship"
when tending explicitly selected land units from multiple ships.
Tolerable.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

src/lib/commands/lten.c

@@ -32,6 +32,7 @@
  *     Thomas Ruschak
  *     Ken Stevens, 1995
  *     Steve McClure, 1998
+ *     Markus Armbruster, 2004-2017
  */
 
 #include <config.h>
@@ -99,9 +100,12 @@ ltend(void)
 	while (nxtitem(&targets, &target)) {
 	    if (!player->owner)
 		continue;
-
+	    if (target.lnd_ship != tender.shp_uid) {
-	    if (target.lnd_ship != tender.shp_uid)
+		if (targets.sel == NS_LIST)
+		    pr("%s is not on %s!\n",
+		       prland(&target), prship(&tender));
 		continue;
+	    }
 	    ontarget = target.lnd_item[ip->i_uid];
 	    if (ontarget == 0 && amt < 0) {
 		pr("No %s on %s\n", ip->i_name, prland(&target));

tests/load-tend/05-ltend-1

@@ -32,7 +32,6 @@ ltend f 200 1 n
 ltend f 200 1 26
 | not on ship
 ltend f 200 1 0
-| usability: does nothing silently
 |
 || from ship to land
 | something the ship can't hold

tests/load-tend/journal.log

@@ -2512,6 +2512,7 @@
     Play#1 output Play#1 6 0 372
     Play#1 input ltend f 200 1 0
     Play#1 command ltend
+    Play#1 output Play#1 1 linf light infantry #0 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 0 total food transferred off of cs   cargo ship (#200)
     Play#1 output Play#1 6 0 371
     Play#1 input ltend i 200/201 1 350/352
@@ -2521,7 +2522,9 @@
     Play#1 output Play#1 6 0 370
     Play#1 input ltend c 200/201 1 350/352
     Play#1 command ltend
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 0 total civilians transferred off of cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 0 total civilians transferred off of cs   cargo ship (#201)
     Play#1 output Play#1 6 0 369
     Play#1 input ltend h 200/201 1 350/352
@@ -2536,11 +2539,15 @@
     Play#1 command ltend
     Play#1 output Play#1 1 cs   cargo ship (#200) out of shells
     Play#1 output Play#1 1 7 total shells transferred off of cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
+    Play#1 output Play#1 1 sup  supply #351 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 5 total shells transferred off of cs   cargo ship (#201)
     Play#1 output Play#1 6 0 366
     Play#1 input ltend g 200/201 21 350/352
     Play#1 command ltend
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 10 total guns transferred off of cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 10 total guns transferred off of cs   cargo ship (#201)
     Play#1 output Play#1 6 0 365
     Play#1 input ltend i 200/201 -1 350/352
@@ -2551,25 +2558,34 @@
     Play#1 input ltend c 200/201 -1 350/352
     Play#1 command ltend
     Play#1 output Play#1 1 No civilians on sup  supply #350
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 0 total civilians transferred to cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 No civilians on sup  supply #352
     Play#1 output Play#1 1 0 total civilians transferred to cs   cargo ship (#201)
     Play#1 output Play#1 6 0 363
     Play#1 input ltend l 200/201 -1 350/352
     Play#1 command ltend
     Play#1 output Play#1 1 No light products on sup  supply #350
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 0 total light products transferred to cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 No light products on sup  supply #352
     Play#1 output Play#1 1 0 total light products transferred to cs   cargo ship (#201)
     Play#1 output Play#1 6 0 362
     Play#1 input ltend s 200/201 -20 351/352
     Play#1 command ltend
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 2 total shells transferred to cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #351 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 5 total shells transferred to cs   cargo ship (#201)
     Play#1 output Play#1 6 0 361
     Play#1 input ltend m 200/201 -25 350/351/352
     Play#1 command ltend
+    Play#1 output Play#1 1 sup  supply #352 is not on cs   cargo ship (#200)!
     Play#1 output Play#1 1 30 total military transferred to cs   cargo ship (#200)
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
+    Play#1 output Play#1 1 sup  supply #351 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 25 total military transferred to cs   cargo ship (#201)
     Play#1 output Play#1 6 0 360
     Play#1 input ltend
@@ -2602,6 +2618,7 @@
     Play#1 input -1
     Play#1 output Play#1 4 Units to be tended?
     Play#1 input 350
+    Play#1 output Play#1 1 sup  supply #350 is not on cs   cargo ship (#201)!
     Play#1 output Play#1 1 0 total food transferred to cs   cargo ship (#201)
     Play#1 output Play#1 6 0 359
     Play#1 input ctld
@@ -2624,6 +2641,7 @@
     Play#0 output Play#0 6 0 640
     Play#0 input ltend m 160 1 310
     Play#0 command ltend
+    Play#0 output Play#0 1 cav  cavalry #310 is not on cs   cargo ship (#160)!
     Play#0 output Play#0 1 0 total military transferred off of cs   cargo ship (#160)
     Play#0 output Play#0 6 0 639
     Play#0 input ltend m 200 1 350