Fixed up file hash lib.

lib/file_hash.nom

@@ -1,46 +1,24 @@
 use "core"
 
-%hash_to_filename <- {}
-
-lua> ".."
-    local Hash = require("openssl.digest");
-    local function sha1(x)
-        local hash = Hash.new("sha1"):final(x);
-        local hex = hash:gsub('.', function(c) return string.format('%02x', string.byte(c)) end)
-        return hex
-    end
-    local lfs = require('lfs');
-    local function attrdir(path)
-        for filename in lfs.dir(path) do
-            if filename ~= "." and filename ~= ".." and filename:sub(1,1) ~= "." then
-                local filename = path..'/'..filename
-                local attr = lfs.attributes(filename);
-                if attr.mode == "directory" then
-                    attrdir(filename);
-                elseif filename:match(".*%.nom") then
-                    local file = io.open(filename);
-                    local hash = sha1(file:read("*a"));
-                    file:close();
-                    \%hash_to_filename[hash] = filename
-                end
-            end
-        end
-    end
-    attrdir(".");
-
-action [sha1 %]
-    lua> "return sha1(\%);"
-
 action [file with hash %hash]
-    %file <- (%hash in %hash_to_filename)
-    assume %file or barf "File with SHA1 hash \%hash not found!"
-    return %file
-
-action [hash of file %filename]
     lua> ".."
-        local f = io.open(\%filename);
-        local hash = sha1(f:read("*a"));
-        f:close();
-        return hash;
+        local Hash = require("openssl.digest")
+        for filename in io.popen('find -L . -type f -name "*.nom"'):lines() do
+            local file = io.open(filename)
+            local contents = file:read("*a")
+            file:close()
+            local hash = Hash.new("sha1"):final(contents)
+            local hex = hash:gsub('.', function(c) return string.format('%02x', string.byte(c)) end)
+            if hex == \%hash then
+                return filename
+            end
+        end
+
+action [hash %, sha1 %]
+    %hashlib <- (=lua "require('openssl.digest')")
+    %hash <- (=lua "\%hashlib.new('sha1'):final(\%)")
+    return: =lua "\%hash:gsub('.', function(c) return string.format('%02x', string.byte(c)) end)"
+
+parse [hash of file %filename] as
+    sha1: =lua "io.open(\%filename):read('*a')"
 
-parse [use file with hash %hash] as: use (file with hash %hash)