Add vterm_cmd to etc/shells

Author: Sbozzolo

README.md

@@ -456,7 +456,7 @@ For `fish`, put this in your `~/.config/fish/config.fish`:
 function vterm_prompt_end;
     vterm_printf '51;A'(whoami)'@'(hostname)':'(pwd)
 end
-functions -c fish_prompt vterm_old_fish_prompt
+functions --copy fish_prompt vterm_old_fish_prompt
 function fish_prompt --description 'Write out the prompt; do not replace this. Instead, put this at end of your file.'
     # Remove the trailing newline from the original prompt. This is done
     # using the string builtin from fish, but to make sure any escape codes
@@ -510,7 +510,7 @@ vterm_cmd() {
 ```
 `fish`:
 ```sh
-function vterm_cmd --description 'Run an emacs command that\'s been defined in vterm-eval-cmds'
+function vterm_cmd --description 'Run an emacs command among the ones been defined in vterm-eval-cmds.'
     set -l vterm_elisp ()
     for arg in $argv
         set -a vterm_elisp (printf '"%s" ' (string replace -a -r '([\\\\"])' '\\\\\\\\$1' $arg))

etc/emacs-vterm-bash.sh

@@ -25,6 +25,20 @@ if [[ "$INSIDE_EMACS" = 'vterm' ]]; then
     }
 fi
 
+# With vterm_cmd you can execute Emacs commands directly from the shell.
+# For example, vterm_cmd message "HI" will print "HI".
+# To enable new commands, you have to customize Emacs's variable
+# vterm-eval-cmds.
+vterm_cmd() {
+    local vterm_elisp
+    vterm_elisp=""
+    while [ $# -gt 0 ]; do
+        vterm_elisp="$vterm_elisp""$(printf '"%s" ' "$(printf "%s" "$1" | sed -e 's|\\|\\\\|g' -e 's|"|\\"|g')")"
+        shift
+    done
+    vterm_printf "51;E$vterm_elisp"
+}
+
 # This is to change the title of the buffer based on information provided by the
 # shell. See, http://tldp.org/HOWTO/Xterm-Title-4.html, for the meaning of the
 # various symbols.

etc/emacs-vterm-zsh.sh

@@ -22,6 +22,20 @@ if [[ "$INSIDE_EMACS" = 'vterm' ]]; then
     alias clear='vterm_printf "51;Evterm-clear-scrollback";tput clear'
 fi
 
+# With vterm_cmd you can execute Emacs commands directly from the shell.
+# For example, vterm_cmd message "HI" will print "HI".
+# To enable new commands, you have to customize Emacs's variable
+# vterm-eval-cmds.
+vterm_cmd() {
+    local vterm_elisp
+    vterm_elisp=""
+    while [ $# -gt 0 ]; do
+        vterm_elisp="$vterm_elisp""$(printf '"%s" ' "$(printf "%s" "$1" | sed -e 's|\\|\\\\|g' -e 's|"|\\"|g')")"
+        shift
+    done
+    vterm_printf "51;E$vterm_elisp"
+}
+
 # This is to change the title of the buffer based on information provided by the
 # shell. See, http://tldp.org/HOWTO/Xterm-Title-4.html, for the meaning of the
 # various symbols.

etc/emacs-vterm.fish

@@ -34,6 +34,18 @@ function fish_title
     pwd
 end
 
+# With vterm_cmd you can execute Emacs commands directly from the shell.
+# For example, vterm_cmd message "HI" will print "HI".
+# To enable new commands, you have to customize Emacs's variable
+# vterm-eval-cmds.
+function vterm_cmd --description 'Run an Emacs command among the ones defined in vterm-eval-cmds.'
+    set -l vterm_elisp ()
+    for arg in $argv
+        set -a vterm_elisp (printf '"%s" ' (string replace -a -r '([\\\\"])' '\\\\\\\\$1' $arg))
+    end
+    vterm_printf '51;E'(string join '' $vterm_elisp)
+end
+
 # Sync directory and host in the shell with Emacs's current directory.
 # You may need to manually specify the hostname instead of $(hostname) in case
 # $(hostname) does not return the correct string to connect to the server.
@@ -43,7 +55,9 @@ end
 function vterm_prompt_end;
     vterm_printf '51;A'(whoami)'@'(hostname)':'(pwd)
 end
-functions -c fish_prompt vterm_old_fish_prompt
+
+# We are going to add a portion to the prompt, so we copy the old one
+functions --copy fish_prompt vterm_old_fish_prompt
 
 function fish_prompt --description 'Write out the prompt; do not replace this. Instead, put this at end of your file.'
     # Remove the trailing newline from the original prompt. This is done