Keep track of current column to deduce correct rule length

Maybe a better option would be to display some bright red markers and
display the full rule on a new line.

🤷

1 files changed, 20 insertions, 1 deletions

diff --git a/.bashprompt b/.bashprompt
index 6dc7e32..e384f17 100644
--- a/.bashprompt
+++ b/.bashprompt
@@ -133,10 +133,29 @@ __set-prompt ()
     BUILDING_PS1=
 }
 
+__current-column ()
+{
+    # Cf. console_codes(4) § ECMA-48 Status Report Commands
+
+    local position
+    read -sdR -p$'\E[6n' position
+
+    local pattern='\[[0-9]+;([0-9]+)'
+
+    if [[ ${position} =~ ${pattern} ]]
+    then
+        echo ${BASH_REMATCH[1]}
+    else
+        echo 0
+    fi
+}
+
 __draw-rule ()
 {
     local rule=''
-    for ((i=0; i<COLUMNS; i++))
+    local column=$(__current-column)
+
+    for ((i=column; i<=COLUMNS; i++))
     do
         rule+=—
     done