refactor(emacs): remove dependency on `require_tool.sh` and clean up code style

plugins/emacs/emacs.plugin.zsh

@@ -9,57 +9,55 @@
 # - You can share opened buffered across opened frames.
 # - Configuration changes made at runtime are applied to all frames.
 
-
-if "$ZSH/tools/require_tool.sh" emacsclient 24 2>/dev/null ; then
-    export EMACS_PLUGIN_LAUNCHER="$ZSH/plugins/emacs/emacsclient.sh"
-
-    # set EDITOR if not already defined.
-    export EDITOR="${EDITOR:-${EMACS_PLUGIN_LAUNCHER}}"
-
-    alias emacs="$EMACS_PLUGIN_LAUNCHER --no-wait"
-    alias e=emacs
-    # open terminal emacsclient
-    alias te="$EMACS_PLUGIN_LAUNCHER -nw"
-
-    # same than M-x eval but from outside Emacs.
-    alias eeval="$EMACS_PLUGIN_LAUNCHER --eval"
-    # create a new X frame
-    alias eframe='emacsclient --alternate-editor "" --create-frame'
-
-    # Emacs ANSI Term tracking
-    if [[ -n "$INSIDE_EMACS" ]]; then
-        chpwd_emacs() { print -P "\033AnSiTc %d"; }
-        print -P "\033AnSiTc %d"    # Track current working directory
-        print -P "\033AnSiTu %n"    # Track username        
-
-        # add chpwd hook
-        autoload -Uz add-zsh-hook
-        add-zsh-hook chpwd chpwd_emacs
-    fi    
-
-    # Write to standard output the path to the file
-    # opened in the current buffer.
-    function efile {
-        local cmd="(buffer-file-name (window-buffer))"
-        "$EMACS_PLUGIN_LAUNCHER" --eval "$cmd" | tr -d \"
-    }
-
-    # Write to standard output the directory of the file
-    # opened in the the current buffer
-    function ecd {
-        local cmd="(let ((buf-name (buffer-file-name (window-buffer))))
-                     (if buf-name (file-name-directory buf-name)))"
-
-        local dir="$($EMACS_PLUGIN_LAUNCHER --eval $cmd | tr -d \")"
-        if [ -n "$dir" ] ;then
-            echo "$dir"
-        else
-            echo "can not deduce current buffer filename." >/dev/stderr
-            return 1
-        fi
-    }
+# Require emacs version to be minimum 24
+autoload -Uz is-at-least
+is-at-least 24 "${${(Az)"$(emacsclient --version 2>/dev/null)"}[2]}" || return 0
+
+# Path to custom emacsclient launcher
+export EMACS_PLUGIN_LAUNCHER="${0:A:h}/emacsclient.sh"
+
+# set EDITOR if not already defined.
+export EDITOR="${EDITOR:-${EMACS_PLUGIN_LAUNCHER}}"
+
+alias emacs="$EMACS_PLUGIN_LAUNCHER --no-wait"
+alias e=emacs
+# open terminal emacsclient
+alias te="$EMACS_PLUGIN_LAUNCHER -nw"
+
+# same than M-x eval but from outside Emacs.
+alias eeval="$EMACS_PLUGIN_LAUNCHER --eval"
+# create a new X frame
+alias eframe='emacsclient --alternate-editor "" --create-frame'
+
+# Emacs ANSI Term tracking
+if [[ -n "$INSIDE_EMACS" ]]; then
+  chpwd_emacs() { print -P "\033AnSiTc %d"; }
+  print -P "\033AnSiTc %d"    # Track current working directory
+  print -P "\033AnSiTu %n"    # Track username
+
+  # add chpwd hook
+  autoload -Uz add-zsh-hook
+  add-zsh-hook chpwd chpwd_emacs
 fi
 
-## Local Variables:
-## mode: sh
-## End:
+# Write to standard output the path to the file
+# opened in the current buffer.
+function efile {
+  local cmd="(buffer-file-name (window-buffer))"
+  local file="$("$EMACS_PLUGIN_LAUNCHER" --eval "$cmd" | tr -d \")"
+
+  if [[ -z "$file" ]]; then
+    echo "Can't deduce current buffer filename." >&2
+    return 1
+  fi
+
+  echo "$file"
+}
+
+# Write to standard output the directory of the file
+# opened in the the current buffer
+function ecd {
+  local file
+  file="$(efile)" || return $?
+  echo "${file:h}"
+}