diff --git a/lib/ulib/vcs b/lib/ulib/vcs
index 0441846..1a91bc8 100644
--- a/lib/ulib/vcs
+++ b/lib/ulib/vcs
@@ -181,11 +181,28 @@ function vcs_vcs_help() {
     uecho "uproject $1: Appeler le gestionnaire de version approprié avec les arguments donnés
 
 USAGE
-    uproject $1 [args]"
+    uproject $1 [args]
+
+note: les commandes suivantes permettent de lancer des opérations avancées:
+$(array_to_lines __VCS_GIT_ADVANCED "" "    ")"
 }
 function vcs_vcs() {
     _vcs_showhelp vcs "$@" && return
 
+    local i f t
+    for i in "${__VCS_GIT_ADVANCED_MAP[@]}"; do
+        splitpair "$i" f t
+        if [ "$1" == "$f" ]; then
+            shift
+            set -- "$t" "$@"
+            break
+        fi
+    done
+    if array_contains __VCS_GIT_ADVANCED "$1"; then
+        "$@"
+        return $?
+    fi
+
     local type
     type="$(_vcs_get_type "$(_vcs_get_dir)")" || return
     "$type" "$@"
@@ -499,6 +516,18 @@ function git_tag() {
 }
 
 # Fonctions avancées de git
+__VCS_GIT_ADVANCED_MAP=(
+    lbs:git_list_branches rbs:git_list_rbranches
+    gb:git_get_branch ib:git_is_branch
+    hr:git_has_remote tb:git_track_branch
+    ic:git_check_cleancheckout ec:git_ensure_cleancheckout
+)
+__VCS_GIT_ADVANCED=(
+    git_list_branches git_list_rbranches
+    git_get_branch git_is_branch
+    git_has_remote git_track_branch
+    git_check_cleancheckout git_ensure_cleancheckout
+)
 function git_list_branches() {
     git for-each-ref refs/heads/ --format='%(refname:short)' | csort
 }
@@ -509,7 +538,7 @@ function git_get_branch() {
     git rev-parse --abbrev-ref HEAD 2>/dev/null
 }
 function git_is_branch() {
-    [ "$(get_branch)" == "${1:-master}" ]
+    [ "$(git_get_branch)" == "${1:-master}" ]
 }
 function git_has_remote() {
     [ -n "$(git config --get remote.${1:-origin}.url)" ]
@@ -527,7 +556,7 @@ function git_check_cleancheckout() {
     [ -z "$(git status --porcelain 2>/dev/null)" ]
 }
 function git_ensure_cleancheckout() {
-    check_cleancheckout || die "Vous avez des modifications locales. Enregistrez ces modifications avant de continuer"
+    git_check_cleancheckout || die "Vous avez des modifications locales. Enregistrez ces modifications avant de continuer"
 }
 
 # fonctions pour git annex