list: Handle errors on empty lists more gracefully (#13138)

Since commit ed1ea24c (Fix INSERT to allow inserting to empty list,
2006-05-15) the list command allows insertion into an empty list at
index 0.  Fix rejection of insertion at non-zero (negative) indices to
present an error message instead of crashing.

While at it, fix the error message of the GET and REMOVE_AT operations
when the list is empty to not present a bogus allowed range.

Add a "RunCMake.list" test to cover failure cases on empty lists.

11 files changed, 29 insertions, 0 deletions

diff --git a/Tests/RunCMake/list/CMakeLists.txt b/Tests/RunCMake/list/CMakeLists.txt
new file mode 100644
index 0000000..e8db6b0
--- /dev/null
+++ b/Tests/RunCMake/list/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/list/EmptyGet0-result.txt b/Tests/RunCMake/list/EmptyGet0-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyGet0-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/list/EmptyGet0-stderr.txt b/Tests/RunCMake/list/EmptyGet0-stderr.txt
new file mode 100644
index 0000000..0c61b01
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyGet0-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at EmptyGet0.cmake:2 \(list\):
+  list GET given empty list
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/list/EmptyGet0.cmake b/Tests/RunCMake/list/EmptyGet0.cmake
new file mode 100644
index 0000000..4947108
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyGet0.cmake
@@ -0,0 +1,2 @@
+set(mylist "")
+list(GET mylist 0 result)
diff --git a/Tests/RunCMake/list/EmptyInsert-1-result.txt b/Tests/RunCMake/list/EmptyInsert-1-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyInsert-1-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/list/EmptyInsert-1-stderr.txt b/Tests/RunCMake/list/EmptyInsert-1-stderr.txt
new file mode 100644
index 0000000..0900ff9
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyInsert-1-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at EmptyInsert-1.cmake:2 \(list\):
+  list index: -1 out of range \(0, 0\)
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/list/EmptyInsert-1.cmake b/Tests/RunCMake/list/EmptyInsert-1.cmake
new file mode 100644
index 0000000..140da5d
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyInsert-1.cmake
@@ -0,0 +1,2 @@
+set(mylist "")
+list(INSERT mylist -1 x)
diff --git a/Tests/RunCMake/list/EmptyRemoveAt0-result.txt b/Tests/RunCMake/list/EmptyRemoveAt0-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyRemoveAt0-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/list/EmptyRemoveAt0-stderr.txt b/Tests/RunCMake/list/EmptyRemoveAt0-stderr.txt
new file mode 100644
index 0000000..b24a0ed
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyRemoveAt0-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at EmptyRemoveAt0.cmake:2 \(list\):
+  list REMOVE_AT given empty list
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/list/EmptyRemoveAt0.cmake b/Tests/RunCMake/list/EmptyRemoveAt0.cmake
new file mode 100644
index 0000000..d6a3e85
--- /dev/null
+++ b/Tests/RunCMake/list/EmptyRemoveAt0.cmake
@@ -0,0 +1,2 @@
+set(mylist "")
+list(REMOVE_AT mylist 0)
diff --git a/Tests/RunCMake/list/RunCMakeTest.cmake b/Tests/RunCMake/list/RunCMakeTest.cmake
new file mode 100644
index 0000000..555051d
--- /dev/null
+++ b/Tests/RunCMake/list/RunCMakeTest.cmake
@@ -0,0 +1,5 @@
+include(RunCMake)
+
+run_cmake(EmptyGet0)
+run_cmake(EmptyRemoveAt0)
+run_cmake(EmptyInsert-1)