--- a/src/com/tmate/hgkit/ll/LocalHgRepo.java	Wed Dec 22 04:00:44 2010 +0100
+++ b/src/com/tmate/hgkit/ll/LocalHgRepo.java	Thu Dec 23 01:31:40 2010 +0100
@@ -3,17 +3,22 @@
  */
 package com.tmate.hgkit.ll;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStreamReader;
 import java.lang.ref.SoftReference;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.TreeSet;
 
 /**
  * @author artem
  */
 public class LocalHgRepo extends HgRepository {
 
-	private File repoDir;
+	private File repoDir; // .hg folder
 	private final String repoLocation;
 
 	public LocalHgRepo(String repositoryPath) {
@@ -26,6 +31,7 @@
 		setInvalid(false);
 		repoDir = repositoryRoot;
 		repoLocation = repositoryRoot.getParentFile().getCanonicalPath();
+		parseRequires();
 	}
 
 	@Override
@@ -57,19 +63,136 @@
 	@Override
 	public HgDataFile getFileNode(String path) {
 		String nPath = normalize(path);
-		String storagePath = toStoragePath(nPath);
+		String storagePath = toStoragePath(nPath, true);
 		RevlogStream content = resolve(storagePath);
 		// XXX no content when no file? or HgDataFile.exists() to detect that? How about files that were removed in previous releases?
 		return new HgDataFile(this, nPath, content);
 	}
+
+	private boolean revlogv1;
+	private boolean store;
+	private boolean fncache;
+	private boolean dotencode;
 	
+	
+	private void parseRequires() {
+		File requiresFile = new File(repoDir, "requires");
+		if (!requiresFile.exists()) {
+			return;
+		}
+		try {
+			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(requiresFile)));
+			String line;
+			while ((line = br.readLine()) != null) {
+				revlogv1 |= "revlogv1".equals(line);
+				store |= "store".equals(line);
+				fncache |= "fncache".equals(line);
+				dotencode |= "dotencode".equals(line);
+			}
+		} catch (IOException ex) {
+			ex.printStackTrace(); // FIXME log
+		}
+	}
+
 	// FIXME much more to be done, see store.py:_hybridencode
-	private static String toStoragePath(String path) {
-		// XXX works for lowercase names only
-		return "store/data/" + path.replace('\\', '/') + ".i";
+	// @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
+	protected String toStoragePath(String path, boolean data) {
+		path = normalize(path);
+		final String STR_STORE = "store/";
+		final String STR_DATA = "data/";
+		final String STR_DH = "dh/";
+		if (!data) {
+			return this.store ? STR_STORE + path : path;
+		}
+		path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
+		StringBuilder sb = new StringBuilder(path.length() << 1);
+		if (store || fncache) {
+			// encodefilename
+			final String reservedChars = "\\:*?\"<>|";
+			// in fact, \\ is unlikely to match, ever - we've replaced all of them already, above. Just regards to store.py 
+			int x;
+			char[] hexByte = new char[2];
+			for (int i = 0; i < path.length(); i++) {
+				final char ch = path.charAt(i);
+				if (ch >= 'a' && ch <= 'z') {
+					sb.append(ch); // POIRAE
+				} else if (ch >= 'A' && ch <= 'Z') {
+					sb.append('_');
+					sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20? 
+				} else if ( (x = reservedChars.indexOf(ch)) != -1) {
+					sb.append('~');
+					sb.append(toHexByte(reservedChars.charAt(x), hexByte));
+				} else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
+					sb.append('~');
+					sb.append(toHexByte(ch, hexByte));
+				} else if (ch == '_') {
+					// note, encoding from store.py:_buildencodefun and :_build_lower_encodefun
+					// differ in the way they process '_' (latter doesn't escape it)
+					sb.append('_');
+					sb.append('_');
+				} else {
+					sb.append(ch);
+				}
+			}
+			// auxencode
+			if (fncache) {
+				x = 0; // last segment start
+				final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
+				windowsReservedFilenames.addAll(Arrays.asList("con prn aux nul com1 com2 com3 com4 com5 com6 com7 com8 com9 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9".split(" "))); 
+				do {
+					int i = sb.indexOf("/", x);
+					if (i == -1) {
+						i = sb.length();
+					}
+					// windows reserved filenames are at least of length 3 
+					if (i - x >= 3) {
+						boolean found = false;
+						if (i-x == 3) {
+							found = windowsReservedFilenames.contains(sb.subSequence(x, i));
+						} else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
+							found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
+						} else if (i-x > 4 && sb.charAt(x+4) == '.') {
+							found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
+						}
+						if (found) {
+							sb.setCharAt(x, '~');
+							sb.insert(x+1, toHexByte(sb.charAt(x+2), hexByte));
+							i += 2;
+						}
+					}
+					if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
+						sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
+						sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
+						i += 2;
+					}
+					x = i+1;
+				} while (x < sb.length());
+			}
+		}
+		final int MAX_PATH_LEN_IN_HGSTORE = 120;
+		if (fncache && (sb.length() + STR_DATA.length() > MAX_PATH_LEN_IN_HGSTORE)) {
+			throw HgRepository.notImplemented(); // FIXME digest and fncache use
+		}
+		if (this.store) {
+			sb.insert(0, STR_STORE + STR_DATA);
+		}
+		sb.append(".i");
+		return sb.toString();
+	}
+
+	private static char[] toHexByte(int ch, char[] buf) {
+		assert buf.length > 1;
+		final String hexDigits = "0123456789abcdef";
+		buf[0] = hexDigits.charAt((ch & 0x00F0) >> 4);
+		buf[1] = hexDigits.charAt(ch & 0x0F);
+		return buf;
 	}
 
 	private static String normalize(String path) {
-		return path.replace('\\', '/');
+		path = path.replace('\\', '/').replace("//", "/");
+		if (path.startsWith("/")) {
+			path = path.substring(1);
+		}
+		return path;
 	}
 }