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Factor out our manual std::filesystem::path.replace_extension replacement into its own function

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Rangi42
2025-07-28 13:11:47 -04:00
parent f7eb986313
commit 53949761a7
1 changed files with 33 additions and 29 deletions
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62
src/gfx/main.cpp
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@@ -717,6 +717,29 @@ static void verboseOutputConfig() {
fputs("Ready.\n", stderr);
}
// Manual implementation of std::filesystem::path.replace_extension().
// macOS <10.15 did not support std::filesystem::path.
static void replaceExtension(std::string &path, char const *extension) {
constexpr std::string_view chars =
// Both must start with a dot!
#if defined(_MSC_VER) || defined(__MINGW32__)
"./\\"sv;
#else
"./"sv;
#endif
size_t len = path.npos;
if (size_t i = path.find_last_of(chars); i != path.npos && path[i] == '.') {
// We found the last dot, but check if it's part of a stem
// (There must be a non-path separator character before it)
if (i != 0 && chars.find(path[i - 1], 1) == chars.npos) {
// We can replace the extension
len = i;
}
}
path.assign(path, 0, len);
path.append(extension);
}
int main(int argc, char *argv[]) {
struct AtFileStackEntry {
int parentInd; // Saved offset into parent argv
@@ -794,36 +817,17 @@ int main(int argc, char *argv[]) {
}
auto autoOutPath = [](bool autoOptEnabled, std::string &path, char const *extension) {
if (autoOptEnabled) {
std::string &image = localOptions.groupOutputs ? options.output : options.input;
if (image.empty()) {
usage.printAndExit(
"No %s specified",
localOptions.groupOutputs ? "output tile data file" : "input image"
);
}
// Manual implementation of std::filesystem::path.replace_extension().
constexpr std::string_view chars =
// Both must start with a dot!
#if defined(_MSC_VER) || defined(__MINGW32__)
"./\\"sv;
#else
"./"sv;
#endif
size_t len = image.npos;
size_t i = image.find_last_of(chars);
if (i != image.npos && image[i] == '.') {
// We found the last dot, but check if it's part of a stem
// (There must be a non-path separator character before it)
if (i != 0 && chars.find(image[i - 1], 1) == chars.npos) {
// We can replace the extension
len = i;
}
}
path.assign(image, 0, len);
path.append(extension);
if (!autoOptEnabled) {
return;
}
path = localOptions.groupOutputs ? options.output : options.input;
if (path.empty()) {
usage.printAndExit(
"No %s specified",
localOptions.groupOutputs ? "output tile data file" : "input image"
);
}
replaceExtension(path, extension);
};
autoOutPath(localOptions.autoAttrmap, options.attrmap, ".attrmap");
autoOutPath(localOptions.autoTilemap, options.tilemap, ".tilemap");