65 lines
1.9 KiB
D
65 lines
1.9 KiB
D
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/**
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* Helper for hashing the content of source files to determine if we need to
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* re-compile certain sources.
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*/
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module hash;
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import std.stdio;
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import std.file;
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import std.string;
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import std.digest.md;
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import std.base64;
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const HASH_FILE = "bin/hash.txt";
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/**
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* Determines if the content of the source file at the given path matches
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* the hash we have for it (if possible).
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* Params:
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* sourcePath = The path to the source file.
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* Returns: True if we have a hash for the source file, and it matches the
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* current hash of the file contents. False if we don't have a hash or it
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* doesn't match.
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*/
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bool contentMatchesHash(string sourcePath) {
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if (!exists(sourcePath) || !isFile(sourcePath)) return false;
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string[string] hashes = readHashes();
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if (sourcePath !in hashes) return false;
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ubyte[16] rawHash = md5Of(readText(sourcePath));
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ubyte[] savedHash = Base64.decode(hashes[sourcePath]);
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return rawHash == savedHash;
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}
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/**
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* Saves the hash of the given source path to the hash file.
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* Params:
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* sourcePath = The source path of the file to save.
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*/
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void saveHash(string sourcePath) {
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if (!exists(sourcePath) || !isFile(sourcePath)) return;
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ubyte[16] rawHash = md5Of(readText(sourcePath));
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string hash = Base64.encode(rawHash);
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string[string] hashes = readHashes();
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hashes[sourcePath] = hash;
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saveHashes(hashes);
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}
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private string[string] readHashes() {
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string[string] hashes;
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if (!exists(HASH_FILE)) return hashes;
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auto file = File(HASH_FILE, "r");
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foreach (string line; lines(file)) {
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string[] parts = split(line, ":");
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string sourcePath = parts[0].strip;
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string hashBase64 = parts[1].strip;
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hashes[sourcePath] = hashBase64;
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}
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return hashes;
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}
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private void saveHashes(string[string] hashes) {
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auto file = File(HASH_FILE, "w");
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foreach (string sourcePath, string hash; hashes) {
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file.writefln!"%s:%s"(sourcePath, hash);
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}
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}
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