e10f67a827
Split from https://github.com/llvm/llvm-project/pull/133161 refactor the code to extract file helpers used in HTML generators for use in other generators for clang-doc
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "File.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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namespace clang {
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namespace doc {
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llvm::Error copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory) {
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llvm::SmallString<128> PathWrite;
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llvm::sys::path::native(OutDirectory, PathWrite);
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llvm::sys::path::append(PathWrite, llvm::sys::path::filename(FilePath));
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llvm::SmallString<128> PathRead;
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llvm::sys::path::native(FilePath, PathRead);
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std::error_code FileErr = llvm::sys::fs::copy_file(PathRead, PathWrite);
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if (FileErr) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"error creating file " +
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llvm::sys::path::filename(FilePath) +
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": " + FileErr.message() + "\n");
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}
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return llvm::Error::success();
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}
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llvm::SmallString<128> computeRelativePath(llvm::StringRef Destination,
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llvm::StringRef Origin) {
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// If Origin is empty, the relative path to the Destination is its complete
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// path.
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if (Origin.empty())
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return Destination;
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// The relative path is an empty path if both directories are the same.
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if (Destination == Origin)
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return {};
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// These iterators iterate through each of their parent directories
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llvm::sys::path::const_iterator FileI = llvm::sys::path::begin(Destination);
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llvm::sys::path::const_iterator FileE = llvm::sys::path::end(Destination);
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llvm::sys::path::const_iterator DirI = llvm::sys::path::begin(Origin);
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llvm::sys::path::const_iterator DirE = llvm::sys::path::end(Origin);
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// Advance both iterators until the paths differ. Example:
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// Destination = A/B/C/D
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// Origin = A/B/E/F
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// FileI will point to C and DirI to E. The directories behind them is the
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// directory they share (A/B).
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while (FileI != FileE && DirI != DirE && *FileI == *DirI) {
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++FileI;
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++DirI;
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}
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llvm::SmallString<128> Result; // This will hold the resulting path.
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// Result has to go up one directory for each of the remaining directories in
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// Origin
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while (DirI != DirE) {
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llvm::sys::path::append(Result, "..");
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++DirI;
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}
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// Result has to append each of the remaining directories in Destination
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while (FileI != FileE) {
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llvm::sys::path::append(Result, *FileI);
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++FileI;
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}
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return Result;
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}
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} // namespace doc
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} // namespace clang
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