normalize uri and CCDB filename on Windows

drive letter is now always lower case

protocol/source/served/lsp/uri.d

@@ -19,7 +19,12 @@ DocumentUri uriFromFile(scope const(char)[] file)
 	if ((!isAbsolute(file) && !file.startsWith("/"))
 		|| !file.length)
 		throw new Exception(text("Tried to pass relative path '", file, "' to uriFromFile"));
-	file = file.buildNormalizedPath.replace("\\", "/");
+	file = file.buildNormalizedPath();
+	version(Windows)
+	{
+		file = file.replace("\\", "/");
+		file = driveName(file).toLower() ~ stripDrive(file);
+	}
 	assert(file.length);
 	if (file.ptr[0] != '/')
 		file = '/' ~ file; // always triple slash at start but never quad slash
@@ -34,7 +39,7 @@ unittest
 
 	version (Windows)
 	{
-
+		assertEquals(uriFromFile(`C:\Home\foo\bar.d`), `file://c%3A/Home/foo/bar.d`);
 	}
 	else
 	{
@@ -283,7 +288,7 @@ unittest
 {
 	assertEquals(uriNormalize(`b/../a.d`), `a.d`);
 	assertEquals(uriNormalize(`b/../../a.d`), `../a.d`);
-	
+
 	foreach (prefix; ["file:///", "file://", "", "/", "//"])
 	{
 		assertEquals(uriNormalize(prefix ~ `foo/bar/./a.d`), prefix ~ `foo/bar/a.d`);

workspace-d/source/workspaced/com/ccdb.d

@@ -6,6 +6,7 @@ module workspaced.com.ccdb;
 import std.exception;
 import std.json;
 import std.path;
+import std.string;
 import fs = std.file;
 
 import workspaced.api;
@@ -144,7 +145,7 @@ class ClangCompilationDatabaseComponent : ComponentWrapper
 	/// in the database.
 	CompileCommand getCompileCommand(string filename) @property
 	{
-		auto normalized = buildNormalizedPath(filename);
+		const normalized = normalizedCcdbPath(filename);
 		auto ccp = normalized in _compileCommands;
 		if (ccp)
 			return *ccp;
@@ -171,8 +172,10 @@ public class CompileCommand
 		import std.algorithm : map;
 		import std.array : array;
 
-		this.directory = enforce("directory" in json, "'directory' missing from Clang compilation database entry")
-			.str;
+		this.directory = normalizedCcdbPath(
+			enforce("directory" in json, "'directory' missing from Clang compilation database entry")
+				.str
+		);
 		this.file = enforce("file" in json, "'file' missing from Clang compilation database entry")
 			.str;
 
@@ -209,7 +212,7 @@ public class CompileCommand
 
 	string getNormalizedFilePath() const
 	{
-		return getPath(file).buildNormalizedPath();
+		return normalizedCcdbPath(getPath(file));
 	}
 
 	string getPath(string filename) const
@@ -303,6 +306,17 @@ public class CompileCommand
 	}
 }
 
+string normalizedCcdbPath(string filePath)
+{
+	const normalized = filePath.buildNormalizedPath();
+	// Let the drive be lower case on Windows (not handled by buildNormalizedPath).
+	// This is needed because commands are resolved by simple string comparison.
+	version (Windows)
+		return driveName(normalized).toLower() ~ stripDrive(normalized);
+	else
+		return normalized;
+}
+
 void feedOptions(
 	in CompileCommand cc,
 	ref HashSet!string imports,