merge: allow smarter tool configuration Add [merge-tool] hgrc section with: <tool>.executable = name or path (<tool>) <tool>.args = args with $local/base/other/output ($local $base $other) <tool>.priority = priority (default 0) <tool>.binary = handles binary (False) <tool>.symlink = handles symlinks (False) <tool>.checkconflict = check for conflict markers (False) <tool>.premerge = try internal simplemerge (True if not binary or symlink) Four built-in tools: internal:{merge,local,other,fail} Add [merge-patterns] section of the form: <pattern> = <tool> Priority of settings is: HGMERGE merge-patterns ui:merge merge-tools by priority hgmerge, if it can be found Changes: unsuccessful merges leave .orig files

filemerge: pull file-merging code into its own module

merge: move the bulk of simplemerge into core - keep existing simplemerge command in contrib - clean up test interface