updated displaying git branch in modeline

Status-line.md

@@ -113,42 +113,34 @@ hook global WinCreate .* %{
 
 ## Git branch integration
 
-Here's another [example by lenormf](https://github.com/mawww/kakoune/issues/657) on how to add more info to the modeline, like the current git branch (status bar)
+Here's an example on how to add more info to the modeline, like the current git branch.
+```
+##
+## git-branch.kak by lenormf
+## Store the current git branch that contains the buffer
+##
+
+declare-option -docstring "name of the git branch holding the current buffer" \
+    str modeline_git_branch
+
+hook global WinCreate .* %{
+    hook window NormalIdle .* %{ evaluate-commands %sh{
+        branch=$(cd "$(dirname "${kak_buffile}")" && git rev-parse --abbrev-ref HEAD 2>/dev/null)
+        if [ -n "${branch}" ]; then
+            printf 'set window modeline_git_branch %%{%s}' "${branch}"
+        fi
+    } }
+}
+```
+The git-branch.kak file is [from lenormf here](https://github.com/lenormf/kakoune-extra/blob/master/widgets/git-branch.kak). You can use option in your modelinefmt with something like the following hook
 
 ```
-## customize the status bar
-hook global BufOpen .*/?[^*].+ %{
-    %sh{
-        function add_hook_on_idle {
-            echo "hook global NormalIdle .* %{ $@ }"
-        }
+hook global WinCreate .* %{ evaluate-commands %sh{
+    is_work_tree=$(cd "$(dirname "${kak_buffile}")" && git rev-parse --is-inside-work-tree 2>/dev/null)
+    if [ "${is_work_tree}" = 'true' ]; then
+        printf 'set-option window modelinefmt %%{%s}' " %opt{modeline_git_branch} ${kak_opt_modelinefmt}"
+    fi 
+}}
+```
 
-        tools=(
-            ## cursor coordinates in the buffer
-            "%val{cursor_line}:%val{cursor_char_column}"
-            ## filetype of the buffer detected by kak
-            "%opt{filetype}"
-            ## name of the buffer
-            "%val{bufname}"
-        )
-        fmt_line=""
-
-        ## current git branch
-        if which git 1>/dev/null; then
-            echo "decl str modeline-git-branch"
-            tools[${#tools[@]}]="%opt{modeline-git-branch}"
-            add_hook_on_idle "%sh{
-                branch=\$(cd \$(readlink -e \$(dirname \${kak_bufname})) && git rev-parse --abbrev-ref HEAD 2>/dev/null)
-                test -n \"\${branch}\" && echo \"set global modeline-git-branch '\${branch}'\"
-            }"
-        fi
-
-        for t in "${tools[@]}"; do
-            test -z "${t}" && continue
-            test -n "${fmt_line}" && fmt_line="${t} ${fmt_line}" || fmt_line="${t}"
-        done
-
-        echo set global modelinefmt "'${fmt_line}'"
-    }
-}
-```
+You can use this strategy to add many different custom modules to your modelinefmt easily.