From dd4c8c216df2c6aea90f7e39e324d4cd6f42efc9 Mon Sep 17 00:00:00 2001
From: Carl Gay <carlgay@gmail.com>
Date: Thu, 2 Jan 2025 17:40:08 -0500
Subject: [PATCH] deft build: better error when no library specified

---
 sources/commands/build.dylan | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sources/commands/build.dylan b/sources/commands/build.dylan
index 5f40521..11dd87c 100644
--- a/sources/commands/build.dylan
+++ b/sources/commands/build.dylan
@@ -51,8 +51,13 @@ define method execute-subcommand
   if (empty?(library-names))
     library-names
       := list(ws/workspace-default-library-name(ws)
-                | error("No libraries found in workspace and no"
-                          " default libraries configured."));
+                | if (all?)
+                    error("No libraries found in workspace and no"
+                            " default libraries configured.");
+                  else
+                    error("Please specify a library to build, use --all,"
+                            " or configure a default library.");
+                  end);
   end;
   for (name in library-names)
     // Let the shell locate dylan-compiler...