Clean up .bashrc.

.bashrc

@@ -21,20 +21,16 @@ __prompt_git_status() {
   #   GIT_PROMPT_SHOW_STASH=1			Show a $ if there is a stash in this repository (superceeded by above).
   # Displays:					The printf formatted git prompt based upon $1 and the environment vaiables above, for example:
   #							S:branch_name >5 *
-  # Returns:					Exit code of the command line before entering this function.
-  # shellcheck disable=SC2155
-  local RET="$?" BRANCH COUNT GIT_PROMPT GIT_PROMPT_MARKER_SET GIT_REPO_INFO PWD=$(pwd -P)
+  # Returns:					0 = Produced a prompt successfully.
+  #						1 = An error occured.
+  local BRANCH COUNT GIT_PROMPT GIT_PROMPT_MARKER_SET GIT_REPO_INFO IFS=
 
-  # Bail out if there's no format argument given.
-  (( $# !=  1 )) && return "$RET"
+  # Bail out if there's no format argument given, or it doesn't contain %s
+  (( $# !=  1 )) || [[ "$1" != *%s* ]] && return 1
 
   # Get some repository information.
   # shellcheck disable=SC2207
-  IFS=$'\n' GIT_REPO_INFO=( $( git rev-parse --is-bare-repository --is-shallow-repository --is-inside-git-dir --is-inside-work-tree 2>/dev/null) )
-  ERR="$?"
-
-  # Do nothing if there's an error.
-  (( ERR >= 1 )) && return "$RET"
+  GIT_REPO_INFO=( $( git rev-parse --is-bare-repository --is-shallow-repository --is-inside-git-dir --is-inside-work-tree 2>/dev/null) ) || return 1
 
   # Generate the prompt.
   if [[ "${GIT_REPO_INFO[2]}" == "true" ]]; then
@@ -140,13 +136,11 @@ __prompt_git_status() {
   # shellcheck disable=SC2059
   printf -- "$1" "$GIT_PROMPT"
 
-  # Return the original error code.
-  return "$RET"
+  return 0
 }
 
 __prompt_user_colour() {
   # Determine the colour of the username in the prompt.
-  local RET="$?"
 
   if [[ "$LOGNAME" == "root" ]]; then
     printf "%s" "1;31m"		# Bright Red.
@@ -156,7 +150,7 @@ __prompt_user_colour() {
     printf "%s" "1;36m"		# Bright Cyan.
   fi
 
-  return "$RET"
+  return 0
 }
 
 __git_prompt_command() {
@@ -165,20 +159,24 @@ __git_prompt_command() {
   #   GIT_DISABLE_PROMPT_PREFETCH=1	Disable automatic 'prefetch' of upstream refs.
   #					This can also be disabled on a per repository basis using:
   #						git config --add --local --bool script.DisablePromptPrefetch true
-  # Returns:					Exit code of the command line before entering this function.
-  local RET="$?"
+  # Returns:				0 = Tasks completed successfully.
+  #					1 = An error occured.
 
   # Run prefetch tasks if inside a work directory.
   [[ -z "$GIT_DISABLE_PROMPT_PREFETCH" ]] && [[ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" == "true" ]] && \
       [[ "$(git config --get --local --bool script.DisablePromptPrefetch 2>/dev/null)" != "true" ]] && {
-    git maintenance run --task=prefetch 2>/dev/null || printf "\\033[1;31m%s\\033[39m\\n" "Git maintenance 'prefetch' task failed." >&2
+    git maintenance run --task=prefetch 2>/dev/null || {
+      printf "\\033[1;31m%s\\033[39m\\n" "Git maintenance 'prefetch' task failed." >&2
+      return 1
+    }
   }
 
-  return "$RET"
+  return 0
 }
 
 __nanorc_prompt_command() {
   # Dynamically handle .nanorc file versions.
+
   hash nano >/dev/null 2>&1 && {
     # shellcheck disable=SC2155
     local NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"
@@ -202,6 +200,8 @@ __nanorc_prompt_command() {
       printf "\\033[1;31m%s\\033[39m\\n" "No .nanorc for version '$NANO_VER'." >&2
     fi
   }
+
+  return 0
 }
 
 __ssh_agent_prompt_command() {
@@ -240,6 +240,7 @@ __ssh_agent_prompt_command() {
       sleep 0.5
     fi
   }
+
   return 0
 }
 
@@ -330,6 +331,7 @@ __read_ssh_agents() {
     unset SSH_AUTH_SOCKS SSH_AGENTS_MTIME
     return 1
   }
+
   return 0
 }
 
@@ -411,11 +413,14 @@ __write_ssh_agents() {
     printf "\\033[1;31m%s\\033[39m\\n" "Failed to write ssh-agent socket list." >&2
     return 1
   fi
+
   return 0
 }
 
 imagebin() {
-  [[ -z "$1" ]] && {
+  # Throw an image file into an imagebin.
+
+  [[ -z "$1" ]] || [[ ! -e "$1" ]] && {
     printf "%s: %s\\n" "Usage" "${FUNCNAME[0]} <filename>" >&2
     return 1
   }