display an arrow if http_proxy is in use

README.md

@@ -45,6 +45,7 @@ different colors for each case;
 a red one if he has not;
 * the current directory in bold, shortened if it takes too much space, while
 preserving the first two directories;
+* an up arrow if an HTTP proxy is in use;
 * the name of the current branch if you are in a version control repository
 (git, mercurial or subversion), in green if everything is up to date, in red if
 there is changes, in yellow if there is pending commits to push;
@@ -95,4 +96,5 @@ what you want to see by editing the PS1 variable here.
 * Does not display the number of commits to be pushed in Mercurial repositories.
 * Subversion repository cannot display commits to be pushed, this is a
 limitation of the Subversion versionning model.
+* The proxy detection only uses the `$http_proxy` environment variable.
 

liquidprompt.bash

@@ -294,6 +294,14 @@ __host_color()
     echo -ne "${ret}${NO_COL}"
 }
 
+# put an arrow if an http proxy is set
+__proxy()
+{
+    if [[ ! -z "$http_proxy" ]] ; then
+        echo -ne "↥"
+    fi
+}
+
 # BASH function that shortens
 # a very long path for display by removing
 # the left most parts and replacing them
@@ -730,6 +738,7 @@ __set_bash_prompt()
     __HOST=$(__host_color)
     __PERM=$(__permissions_color)
      __PWD=$(__shorten_path "$PWD" $LP_PATH_LENGTH)
+    __PROXY=$(__proxy)
 
     # right of main prompt: space at left
      __GIT=$(__sl "$(__git_branch_color)")
@@ -748,12 +757,12 @@ __set_bash_prompt()
     if [[ "$EUID" -ne "0" ]]
     then
         # path in foreground color
-        PS1="${PS1}${BOLD_FG}${__PWD}${NO_COL}]"
+        PS1="${PS1}${BOLD_FG}${__PWD}${NO_COL}]${__PROXY}"
         # add VCS infos
         PS1="${PS1}${__GIT}${__HG}${__SVN}"
     else
         # path in yellow
-        PS1="${PS1}${YELLOW}${__PWD}${NO_COL}]"
+        PS1="${PS1}${YELLOW}${__PWD}${NO_COL}]${__PROXY}"
         # do not add VCS infos
     fi
     # add return code and prompt mark