Fix bug #7870: Win installer: check for Gnumeric

Gnumeric is needed for the spreadsheet external inset template.

development/Win32/packaging/installer/include/detection.nsh

@@ -9,6 +9,7 @@ Detection of external component locations
 Function SearchExternal
   Call SearchLaTeX
   Call SearchBibTeXEditor
+  Call SearchGnumeric
 FunctionEnd
 
 #--------------------------------
@@ -111,3 +112,26 @@ Function SearchBibTeXEditor
   ${EndIf}
 
 FunctionEnd
+
+
+#--------------------------------
+# Gnumeric
+
+Function SearchGnumeric
+
+  ReadRegStr $PathGnumeric HKCU "Software\GNOME\Gnumeric" "Path"
+
+  ${IfNot} ${FileExists} "$PathGnumeric\gnumeric.exe"
+    ReadRegStr $PathGnumeric HKLM "Software\GNOME\Gnumeric" "Path"
+  ${EndIf}
+
+  ${IfNot} ${FileExists} "$PathGnumeric\gnumeric.exe"
+    ReadRegStr $0 HKLM "Software\Classes\Applications\gnumeric.exe\shell\Open\command" ""
+    ${If} $0 != ""
+      StrCpy $0 $0 -18 # remove \"gnumeric.exe" "%1"\"
+      StrCpy $PathGnumeric $0
+    ${EndIf}
+  ${EndIf}
+
+FunctionEnd
+

development/Win32/packaging/installer/include/variables.nsh

@@ -9,6 +9,7 @@ Variables that are shared between multiple files
 Var PathLaTeX
 Var PathLaTeXLocal
 Var PathBibTeXEditor
+Var PathGnumeric
 
 Var SetupLaTeX
 Var SizeLaTeX

development/Win32/packaging/installer/setup/configure.nsh

@@ -94,6 +94,9 @@ Section -Configure
   ${If} $PathBibTeXEditor != ""
     StrCpy $PathPrefix "$PathPrefix;$PathBibTeXEditor"
   ${EndIf}
+  ${If} $PathGnumeric != ""
+    StrCpy $PathPrefix "$PathPrefix;$PathGnumeric"
+  ${EndIf}
 
   FileWrite $DistFile '\path_prefix "$PathPrefix"$\r$\n'
 

status.20x

@@ -242,3 +242,6 @@ What's new
 
 - Remove a temporary log file from the user directory after reconfigure.
 
+- Windows installer now detects Gnumeric which is needed for the
+  spreadsheet external inset template (bug 7870).
+