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#include "packages.h"
#include "common/io.h"
#include "common/processing.h"
#include "common/strutil.h"
static bool isValidNixPkg(FFstrbuf* pkg) {
if (!ffPathExists(pkg->chars, FF_PATHTYPE_DIRECTORY)) {
return false;
}
ffStrbufSubstrAfterLastC(pkg, '/');
if (
ffStrbufStartsWithS(pkg, "nixos-system-nixos-") ||
ffStrbufEndsWithS(pkg, "-doc") ||
ffStrbufEndsWithS(pkg, "-man") ||
ffStrbufEndsWithS(pkg, "-info") ||
ffStrbufEndsWithS(pkg, "-dev") ||
ffStrbufEndsWithS(pkg, "-bin")) {
return false;
}
enum { START,
DIGIT,
DOT,
MATCH } state = START;
for (uint32_t i = 0; i < pkg->length; i++) {
char c = pkg->chars[i];
switch (state) {
case START:
if (ffCharIsDigit(c)) {
state = DIGIT;
}
break;
case DIGIT:
if (ffCharIsDigit(c)) {
continue;
}
if (c == '.') {
state = DOT;
} else {
state = START;
}
break;
case DOT:
if (ffCharIsDigit(c)) {
state = MATCH;
} else {
state = START;
}
break;
case MATCH:
break;
}
}
return state == MATCH;
}
static bool checkNixCache(FFstrbuf* cacheDir, FFstrbuf* hash, uint32_t* count) {
if (!ffPathExists(cacheDir->chars, FF_PATHTYPE_FILE)) {
return false;
}
FF_STRBUF_AUTO_DESTROY cacheContent = ffStrbufCreate();
if (!ffReadFileBuffer(cacheDir->chars, &cacheContent)) {
return false;
}
// Format: <hash>\n<count>
uint32_t split = ffStrbufFirstIndexC(&cacheContent, '\n');
if (split == cacheContent.length) {
return false;
}
ffStrbufSetNS(hash, split, cacheContent.chars);
*count = (uint32_t) atoi(cacheContent.chars + split + 1);
return true;
}
static bool writeNixCache(FFstrbuf* cacheDir, FFstrbuf* hash, uint32_t count) {
FF_STRBUF_AUTO_DESTROY cacheContent = ffStrbufCreateCopy(hash);
ffStrbufAppendF(&cacheContent, "\n%u", count);
return ffWriteFileBuffer(cacheDir->chars, &cacheContent);
}
static uint32_t getNixPackagesImpl(char* path) {
// Nix detection is kinda slow, so we only do it if the dir exists
if (!ffPathExists(path, FF_PATHTYPE_DIRECTORY)) {
return 0;
}
FF_STRBUF_AUTO_DESTROY cacheDir = ffStrbufCreateCopy(&instance.state.platform.cacheDir);
ffStrbufEnsureEndsWithC(&cacheDir, '/');
ffStrbufAppendS(&cacheDir, "fastfetch/packages/nix");
ffStrbufAppendS(&cacheDir, path);
// Check the hash first to determine if we need to recompute the count
FF_STRBUF_AUTO_DESTROY hash = ffStrbufCreateA(64);
FF_STRBUF_AUTO_DESTROY cacheHash = ffStrbufCreateA(64);
uint32_t count = 0;
ffProcessAppendStdOut(&hash, (char* const[]) { "nix-store", "--query", "--hash", path, NULL });
if (checkNixCache(&cacheDir, &cacheHash, &count) && ffStrbufEqual(&hash, &cacheHash)) {
return count;
}
// Cache is invalid, recompute the count
count = 0;
// Implementation based on bash script from here:
// https://github.com/fastfetch-cli/fastfetch/issues/195#issuecomment-1191748222
FF_STRBUF_AUTO_DESTROY output = ffStrbufCreateA(1024);
ffProcessAppendStdOut(&output, (char* const[]) { "nix-store", "--query", "--requisites", path, NULL });
uint32_t lineLength = 0;
for (uint32_t i = 0; i < output.length; i++) {
if (output.chars[i] != '\n') {
lineLength++;
continue;
}
output.chars[i] = '\0';
FFstrbuf line = {
.allocated = 0,
.length = lineLength,
.chars = output.chars + i - lineLength
};
if (isValidNixPkg(&line)) {
count++;
}
lineLength = 0;
}
writeNixCache(&cacheDir, &hash, count);
return count;
}
uint32_t ffPackagesGetNix(FFstrbuf* baseDir, const char* dirname) {
uint32_t baseDirLength = baseDir->length;
ffStrbufAppendS(baseDir, dirname);
uint32_t num_elements = getNixPackagesImpl(baseDir->chars);
ffStrbufSubstrBefore(baseDir, baseDirLength);
return num_elements;
}
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