Use global PLATFORM. Add dynamic .nanorc support. Fix git prompt.

.bashrc

@@ -121,6 +121,32 @@ __prompt_user_colour() {
   return "$RET"
 }
 
+__nanorc_prompt_command() {
+  hash nano >/dev/null 2>&1 && {
+    # shellcheck disable=SC2155
+    local NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"
+
+    # Darwin specifc .nanorc version.
+    [[ "$PLATFORM" == "Darwin" ]] && NANO_VER="darwin"
+
+    if [[ -f "$HOME/.nanorc-$NANO_VER" ]]; then
+      if (( NANO_VER <= 4 )); then
+        ( cd "$HOME" && ln -sf ".nanorc-$NANO_VER" ".nanorc" )
+      else
+        # shellcheck disable=SC2139
+        alias nano="nano -f \"$HOME/.nanorc-$NANO_VER\""
+      fi
+    else
+      if (( NANO_VER <= 4 )); then
+        [[ -L "$HOME/.nanorc" ]] && rm -f "$HOME/.nanorc"
+      else
+        unalias nano
+      fi
+      printf "\\033[1;31;40m%s\\033[0;39m\\n" "No .nanorc for version '$NANO_VER'." >&2
+    fi
+  }
+}
+
 __find_ssh_agent_sock() {
   # Find an *active* ssh agent socket.
   # Returns: 0 = Found an active socket.
@@ -145,13 +171,10 @@ __read_ssh_agents() {
   # Read all the known ssh agent sockets into an array.
   # Returns: 0 = Processed and read the agents file without issue.
   #          1 = Error processing/reading the agents file.
-  local ERR FD I PLATFORM SOCK
+  local ERR FD I SOCK
 
   [[ ! -e "$HOME/.ssh/agents" ]] && touch "$HOME/.ssh/agents"
 
-  # Determine the platform being logged into.
-  PLATFORM="$(uname -s)"
-
   # Lock the ~/.ssh/agents file.
   if [[ "$PLATFORM" == "Linux" ]]; then
     # Linux has 'flock', thankfully.
@@ -235,9 +258,6 @@ __write_ssh_agents() {
     (( $? <= 1 )) && SOCKS+=("${SSH_AUTH_SOCKS[$I]}")
   done
 
-  # Determine the platform being logged into.
-  PLATFORM="$(uname -s)"
-
   # Lock the ~/.ssh/agents file.
   if [[ "$PLATFORM" == "Linux" ]]; then
     # Make sure SSH_AUTH_SOCKS has the most up to date data.
@@ -361,7 +381,7 @@ HISTTIMEFORMAT="%d/%m/%y %H:%M:%S  "
 history -r
 
 # The commands to execute before the prompt is displayed.
-PROMPT_COMMAND="__ssh_agent_prompt_command"
+PROMPT_COMMAND="__nanorc_prompt_command; __ssh_agent_prompt_command"
 
 # Git prompt options.
 GIT_PROMPT_SHOW_TYPE=1
@@ -380,12 +400,12 @@ if (( BASH_VERSINFO[0] >= 4 )); then
   # Trim the path in the prompt.
   PROMPT_DIRTRIM=2
   # Coloured username + host + directory:
-  PS1='[\[$(tput bold)$(tput setaf "$(__prompt_user_colour)")\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\w\[$(tput sgr0)\]$(__prompt_git_status "\[\033[0;35;40m\] (%s)\[\033[0;37;40m\]") ->'
+  PS1='[\[$(tput bold)$(tput setaf "$(__prompt_user_colour)")\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\w\[$(tput sgr0)\]$(__prompt_git_status "\[\\033[0;35;40m\] (%s)\[\\033[0;37;40m\]") ->'
 else
   # Set the prompts.
   # Coloured username + host + directory:
   # shellcheck disable=SC2154
-  PS1='[\[$(tput bold)$(tput setaf "$(__prompt_user_colour)")\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '\''{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}'\'')\[$(tput sgr0)\]$(__prompt_git_status "\[\033[0;35;40m\] (%s)\[\033[0;37;40m\]") ->'
+  PS1='[\[$(tput bold)$(tput setaf "$(__prompt_user_colour)")\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '\''{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}'\'')\[$(tput sgr0)\]$(__prompt_git_status "\[\\033[0;35;40m\] (%s)\[\\033[0;37;40m\]") ->'
 fi
 
 # Set the debugger prompt.
@@ -434,22 +454,6 @@ PLATFORM="$(uname -s)"
 # Platform specific set up.
 if [[ "$PLATFORM" = "Linux" ]]; then
   # Linux specific functions.
-  hash nano >/dev/null 2>&1 && nano() {
-    # shellcheck disable=SC2155
-    local NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"
-    if [[ -f "$HOME/.nanorc-$NANO_VER" ]]; then
-      if (( NANO_VER <= 4 )); then
-        ( cd "$HOME" && ln -sf ".nanorc-$NANO_VER" ".nanorc" )
-        command nano "$@"
-        rm -f "$HOME/.nanorc"
-      else
-        command nano -f "$HOME/.nanorc-$NANO_VER" "$@"
-      fi
-    else
-      printf "%s: %s\\n" "${FUNCNAME[0]}" "no .nanorc for version '$NANO_VER'" >&2
-      return 1
-    fi
-  }
   hash ps grep >/dev/null 2>&1 && psgrep() {
     if [[ -n "$1" ]]; then
       # shellcheck disable=SC2009
@@ -473,18 +477,6 @@ if [[ "$PLATFORM" = "Linux" ]]; then
   hash pinfo >/dev/null 2>&1 && alias info='pinfo'
   hash ping >/dev/null 2>&1 && alias ping='ping -b'
 elif [[ "$PLATFORM" = "Darwin" ]]; then
-  # Darwin specific functions.
-  hash nano >/dev/null 2>&1 && nano() {
-    if [[ -f "$HOME/.nanorc-darwin" ]]; then
-      ( cd "$HOME" && ln -sf ".nanorc-darwin" ".nanorc" )
-      command nano "$@"
-      rm -f "$HOME/.nanorc"
-    else
-      printf "%s: %s\\n" "${FUNCNAME[0]}" "no .nanorc-darwin found" >&2
-      return 1
-    fi
-  }
-
   # Darwin specific aliases.
   hash df >/dev/null 2>&1 && alias df='df -P'
   hash ls >/dev/null 2>&1 && alias ls='ls -bFG'
@@ -492,4 +484,3 @@ elif [[ "$PLATFORM" = "Darwin" ]]; then
 else
   echo "${BASH_SOURCE##*/}: unsupported platform: $PLATFORM" >&2
 fi
-unset PLATFORM