ExternalData: Add support for custom download scripts

Add support for a special URL template to map the fetch operation
to a project-specified .cmake script insead of using file(DOWNLOAD).

Extend the Module.ExternalData test to cover the behavior.
Extend the RunCMake.ExternalData test to cover error cases.

13 files changed, 61 insertions, 0 deletions

diff --git a/Tests/RunCMake/ExternalData/BadCustom1-result.txt b/Tests/RunCMake/ExternalData/BadCustom1-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom1-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalData/BadCustom1-stderr.txt b/Tests/RunCMake/ExternalData/BadCustom1-stderr.txt
new file mode 100644
index 0000000..5d2986d
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom1-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
+  Bad ExternalDataCustomScript key '0BadKey' in URL template:
+
+   ExternalDataCustomScript://0BadKey/%\(algo\)/%\(hash\)
+
+  The key must be a valid C identifier.
+Call Stack \(most recent call first\):
+  BadCustom1.cmake:[0-9]+ \(ExternalData_Add_Target\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalData/BadCustom1.cmake b/Tests/RunCMake/ExternalData/BadCustom1.cmake
new file mode 100644
index 0000000..ec94fc1
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom1.cmake
@@ -0,0 +1,5 @@
+include(ExternalData)
+set(ExternalData_URL_TEMPLATES
+  "ExternalDataCustomScript://0BadKey/%(algo)/%(hash)"
+  )
+ExternalData_Add_Target(Data)
diff --git a/Tests/RunCMake/ExternalData/BadCustom2-result.txt b/Tests/RunCMake/ExternalData/BadCustom2-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom2-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalData/BadCustom2-stderr.txt b/Tests/RunCMake/ExternalData/BadCustom2-stderr.txt
new file mode 100644
index 0000000..4d59ca9
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom2-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
+  Bad ExternalDataCustomScript key '' in URL template:
+
+   ExternalDataCustomScript:///%\(algo\)/%\(hash\)
+
+  The key must be a valid C identifier.
+Call Stack \(most recent call first\):
+  BadCustom2.cmake:[0-9]+ \(ExternalData_Add_Target\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalData/BadCustom2.cmake b/Tests/RunCMake/ExternalData/BadCustom2.cmake
new file mode 100644
index 0000000..1ed7646
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom2.cmake
@@ -0,0 +1,5 @@
+include(ExternalData)
+set(ExternalData_URL_TEMPLATES
+  "ExternalDataCustomScript:///%(algo)/%(hash)"
+  )
+ExternalData_Add_Target(Data)
diff --git a/Tests/RunCMake/ExternalData/BadCustom3-result.txt b/Tests/RunCMake/ExternalData/BadCustom3-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom3-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalData/BadCustom3-stderr.txt b/Tests/RunCMake/ExternalData/BadCustom3-stderr.txt
new file mode 100644
index 0000000..460814b
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom3-stderr.txt
@@ -0,0 +1,7 @@
+^CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
+  No ExternalData_CUSTOM_SCRIPT_MissingKey is set for URL template:
+
+   ExternalDataCustomScript://MissingKey/%\(algo\)/%\(hash\)
+Call Stack \(most recent call first\):
+  BadCustom3.cmake:[0-9]+ \(ExternalData_Add_Target\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalData/BadCustom3.cmake b/Tests/RunCMake/ExternalData/BadCustom3.cmake
new file mode 100644
index 0000000..b4f2fb8
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom3.cmake
@@ -0,0 +1,5 @@
+include(ExternalData)
+set(ExternalData_URL_TEMPLATES
+  "ExternalDataCustomScript://MissingKey/%(algo)/%(hash)"
+  )
+ExternalData_Add_Target(Data)
diff --git a/Tests/RunCMake/ExternalData/BadCustom4-result.txt b/Tests/RunCMake/ExternalData/BadCustom4-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom4-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/ExternalData/BadCustom4-stderr.txt b/Tests/RunCMake/ExternalData/BadCustom4-stderr.txt
new file mode 100644
index 0000000..b83bcee
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom4-stderr.txt
@@ -0,0 +1,7 @@
+^CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
+  No ExternalData_CUSTOM_SCRIPT_RelPathKey is not set to a full path:
+
+   RelPathScript.cmake
+Call Stack \(most recent call first\):
+  BadCustom4.cmake:[0-9]+ \(ExternalData_Add_Target\)
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/ExternalData/BadCustom4.cmake b/Tests/RunCMake/ExternalData/BadCustom4.cmake
new file mode 100644
index 0000000..0cc5521
--- /dev/null
+++ b/Tests/RunCMake/ExternalData/BadCustom4.cmake
@@ -0,0 +1,6 @@
+include(ExternalData)
+set(ExternalData_URL_TEMPLATES
+  "ExternalDataCustomScript://RelPathKey/%(algo)/%(hash)"
+  )
+set(ExternalData_CUSTOM_SCRIPT_RelPathKey "RelPathScript.cmake")
+ExternalData_Add_Target(Data)
diff --git a/Tests/RunCMake/ExternalData/RunCMakeTest.cmake b/Tests/RunCMake/ExternalData/RunCMakeTest.cmake
index 04e3d59..7afd289 100644
--- a/Tests/RunCMake/ExternalData/RunCMakeTest.cmake
+++ b/Tests/RunCMake/ExternalData/RunCMakeTest.cmake
@@ -1,5 +1,9 @@
 include(RunCMake)
 
+run_cmake(BadCustom1)
+run_cmake(BadCustom2)
+run_cmake(BadCustom3)
+run_cmake(BadCustom4)
 run_cmake(BadHashAlgo1)
 run_cmake(BadOption1)
 run_cmake(BadOption2)