Support for downloading deps via bzr.

src/rebar_deps.erl

@@ -204,6 +204,11 @@ download_source(AppDir, {git, Url, Rev}) ->
     ok = filelib:ensure_dir(AppDir),
     rebar_utils:sh(?FMT("git clone -n ~s", [Url]), [], filename:dirname(AppDir)),
     rebar_utils:sh(?FMT("git checkout ~s", [Rev]), [], AppDir);
+download_source(AppDir, {bzr, Url, Rev}) ->
+    ok = filelib:ensure_dir(AppDir),
+    rebar_utils:sh(?FMT("bzr branch -r ~s ~s ~s",
+                        [Rev, Url, filename:basename(AppDir)]), [],
+                   filename:dirname(AppDir));
 download_source(AppDir, {svn, Url, Rev}) ->
     ok = filelib:ensure_dir(AppDir),
     rebar_utils:sh(?FMT("svn checkout -r ~s ~s ~s",
@@ -215,7 +220,8 @@ download_source(AppDir, {svn, Url, Rev}) ->
 %% Source helper functions
 %% ===================================================================
 
-source_engine_avail({Name, _, _}) when Name == hg; Name == git; Name == svn ->
+source_engine_avail({Name, _, _})
+  when Name == hg; Name == git; Name == svn; Name == bzr ->
     case scm_client_vsn(Name) >= required_scm_client_vsn(Name) of
         true ->
             true;
@@ -237,12 +243,15 @@ scm_client_vsn(Path, VsnArg, VsnRegex) ->
 
 required_scm_client_vsn(hg)  -> {1, 4};
 required_scm_client_vsn(git) -> {1, 6};
+required_scm_client_vsn(bzr) -> {2, 0};
 required_scm_client_vsn(svn) -> {1, 6}.
 
 scm_client_vsn(hg) ->
     scm_client_vsn(os:find_executable(hg), " --version", "version (\\d+).(\\d+)");
 scm_client_vsn(git) ->
     scm_client_vsn(os:find_executable(git), " --version", "git version (\\d+).(\\d+)");
+scm_client_vsn(bzr) ->
+    scm_client_vsn(os:find_executable(bzr), " --version", "Bazaar \\(bzr\\) (\\d+).(\\d+)");
 scm_client_vsn(svn) ->
     scm_client_vsn(os:find_executable(svn), " --version", "svn, version (\\d+).(\\d+)");
 scm_client_vsn(_) ->