forked from lix-project/lix
a562d544d8
I.e. do what git does. I'm too lazy to keep the builtin help text up to date :-) Also add ‘--help’ to various commands that lacked it (e.g. nix-collect-garbage).
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
#include "hash.hh"
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#include "shared.hh"
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#include <iostream>
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using namespace nix;
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void printHelp()
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{
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showManPage("nix-hash");
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}
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void run(Strings args)
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{
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HashType ht = htMD5;
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bool flat = false;
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bool base32 = false;
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bool truncate = false;
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enum { opHash, opTo32, opTo16 } op = opHash;
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Strings ss;
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for (Strings::iterator i = args.begin();
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i != args.end(); i++)
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{
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if (*i == "--flat") flat = true;
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else if (*i == "--base32") base32 = true;
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else if (*i == "--truncate") truncate = true;
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else if (*i == "--type") {
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++i;
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if (i == args.end()) throw UsageError("`--type' requires an argument");
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ht = parseHashType(*i);
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if (ht == htUnknown)
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throw UsageError(format("unknown hash type `%1%'") % *i);
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}
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else if (*i == "--to-base16") op = opTo16;
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else if (*i == "--to-base32") op = opTo32;
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else ss.push_back(*i);
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}
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if (op == opHash) {
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foreach (Strings::iterator, i, ss) {
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Hash h = flat ? hashFile(ht, *i) : hashPath(ht, *i).first;
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if (truncate && h.hashSize > 20) h = compressHash(h, 20);
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std::cout << format("%1%\n") %
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(base32 ? printHash32(h) : printHash(h));
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}
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}
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else {
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foreach (Strings::iterator, i, ss) {
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Hash h = parseHash16or32(ht, *i);
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std::cout << format("%1%\n") %
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(op == opTo16 ? printHash(h) : printHash32(h));
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}
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}
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}
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string programId = "nix-hash";
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