colorized path in PS1

Question

I'm trying to display path in colors but I have problem with this.

I have some constant path - in variable MyPath. I want to create colorized path in PS1 but if pwd showing different path then my (but including MyPath) then the rest I want to print in different color (with slash in different color).

I wrote some code but I don't know hot to apply this to PS1.

It should be something like this :

[ root@192.168.1.199:/ -> /media/user/folder/ ]
# : cd /var/www/html
[ root@192.168.1.199:/ -> /var/www/html/ ] (blue slash and green dir names)
# : cd applications
[ root@192.168.1.199:/ -> /var/www/html/applications/ ] (blue slash and green dir names but last 2 slashes in green color and last dir "application" in red color)
# : cd tmp
[ root@192.168.1.199:/ -> /var/www/html/applications/tmp/ ] (blue slash and green dir names but last 3 slashes in green color and 2 last dirs "application" and "tmp" in red color)

And I got stuck - I don't know how to do this.

My code :

#!/bin/bash
MyPath="/var/www/html"
MyPathLength=$( echo ${MyPath} | wc -m)
CurrentPath="/var/www/html/functions/design"
slashColor="\[$(tput setaf 6)\]/\[$(tput sgr0)\]"
dirColor="\[$(tput setaf 2)\]"
path="";
FinalPath="";

for w in $(echo ${CurrentPath} | tr "/" " "); 
do 
  path="${path}/${w}";
  pathLength=$( echo ${path} | wc -m)

  if [ "${pathLength}" == "${MyPathLength}" ];
  then 
       FinalPath="${FinalPath}\[$(tput setaf 6)\]/\[$(tput sgr0)\]\[$(tput setaf 2)\]$w\[$(tput sgr0)\]\[$(tput setaf 6)\]/\[$(tput sgr0)\]";
  elif [ "${pathLength}" -lt "${MyPathLength}" ];
       then
            FinalPath="${FinalPath}\[$(tput setaf 6)\]/\[$(tput sgr0)\]\[$(tput setaf 2)\]$w\[$(tput sgr0)\]";
       elif [ "${pathLength}" -gt "${MyPathLength}" ];
            then
                 FinalPath="${FinalPath}\[$(tput setaf 1)\]$w\[$(tput sgr0)\]\[$(tput setaf 2)\]/\[$(tput sgr0)\]";
            fi;
done

echo "PS1=\"${FinalPath}\"" > /home/bashrc_split
cd "/";
(
 bash --rcfile /home/bashrc_split # I want to open new shell with new PS1
)

Any help?

Answer 1

I'd put something similar to the followig code in .bashrc without requiring other files to be in open&write each time you press the enter key

SEP=("/" "/")
SEP_COLOR=("\e[0;34m" "\e[0;32m")     #colors for: (FIXED - DEFAULT) SEPARATOR STRING
DIR_COLOR=("\e[0;32m" "\e[0;31m")     #colors for: (FIXED - DEFAULT) DIR NAMES
CLOSE_COLOR="\e[0m"

FIXED_DIR=" /var/www/html"
FIXED_DIR=$(realpath ${FIXED_DIR})
FIXED_DIR_ARRAY=()

DIR=${FIXED_DIR}
while [[ "$DIR" != "/" ]]; do
    B=$(basename  -z $DIR)
    DIR=$(dirname -z $DIR) 
    FIXED_DIR_ARRAY+=($B)
done

set_PS1 (){
    local DIR=$PWD
    local CUR_DIR_ARRAY=()

while : ; do
    local B=$(basename  -z $DIR)
    local DIR=$(dirname -z $DIR) 
    CUR_DIR_ARRAY+=($B)
    [[ "$DIR" == "/" ]] && break
done
local SELECTOR=0
local STR=""

local i=1 
while [[ "$i" -le "${#CUR_DIR_ARRAY[@]}" ]] ; do 
    if [ -n $SELECTOR ] &&
       [ $i -gt ${#FIXED_DIR_ARRAY[@]} ] ||
       [ "${CUR_DIR_ARRAY[-$i]}" != "${FIXED_DIR_ARRAY[-$i]}" ];
    then
        SELECTOR=1
    fi  
    local x=$(($SELECTOR%2));
    STR+="${SEP_COLOR[$x]}${SEP[$x]}"
    [[ "${CUR_DIR_ARRAY[-$i]}" != "${SEP[$x]}" ]] &&  STR+="${DIR_COLOR[$x]}${CUR_DIR_ARRAY[-$i]}"
    STR+="${CLOSE_COLOR}"
    ((i++))
done
    printf "${STR}"

}

PS1="[ \u@\h:/ -> \[\$(set_PS1)\] ] "

Answer 2

For now it's work good but it must be rewriten. When somebody go to /var/www/html/next_dir/ then next_dir is green and var www and html are red :)

subshell.sh :

cd "/var/www/html";
(
  bash --rcfile /home/username/bashrc_mount;
)

bashrc_mount :

#!/bin/bash
function UpdatePath()
{
    MyPath="$1";
    MyPathLength=$( echo ${MyPath} | wc -m);
    CurrentPath="`pwd`";

    if [ $( echo ${CurrentPath} | grep "${MyPath}" | wc -l) == "0" ];
    then 
         $(cd ${MyPath}"/"); # this doesn't work in subshell - I don't know why... :(
    fi;

    path="";
    FinalPath="";

    for w in $(echo ${CurrentPath} | tr "/" " "); 
    do 
        path="${path}/${w}";
        pathLength=$( echo ${path} | wc -m);

     if [ "${pathLength}" == "${MyPathLength}" ];
     then 
          FinalPath="${FinalPath}$(tput setaf 3)/$(tput sgr0)$(tput setaf 1)$w$(tput sgr0)$(tput setaf 4)/$(tput sgr0)";
     elif [ "${pathLength}" -lt "${MyPathLength}" ];
          then
               FinalPath="${FinalPath}$(tput setaf 3)/$(tput sgr0)$(tput setaf 1)$w$(tput sgr0)";
          elif [ "${pathLength}" -gt "${MyPathLength}" ];
               then
                    FinalPath="${FinalPath}$(tput setaf 2)$w$(tput sgr0)$(tput setaf 4)/$(tput sgr0)";
               fi;
    done
    if [ "${CurrentPath}" == "/" ];
    then 
             FinalPath="$(tput setaf 3)/$(tput sgr0)";
    fi;

    echo "${FinalPath}";
}

DIR="$(pwd)";
PS1="$(tput setaf 4)$(tput bold)[ $(tput setaf 6)\u$(tput setaf 4)@$(tput setaf 1)${address}$(tput setaf 4):$(tput setaf 6)${mountFrom} $(tput setaf 4)]\n\[\$(UpdatePath \$(echo -en \$DIR) \${montTo} )\] \n$(tput setaf 6)\\$ $(tput setaf 7): $(tput sgr0)$(tput sgr0)";

Now I have problem with changing directory

When subshell is started in /var/www/html and somebody will go up (like /var/www) then it should move him to /var/www/html. the same when will do "cd /". For now it doesn't work but after this I'll rewrite code :)