From f133e554ff80191fd8e2eed3c8d68669e8c44764 Mon Sep 17 00:00:00 2001
From: jixiuf <jixiuf@qq.com>
Date: Tue, 15 Oct 2019 23:02:52 +0800
Subject: Support sending Elisp Command to Emacs Buffer

---
 README.md      |  9 +++++++++
 elisp.c        |  4 ++++
 elisp.h        |  2 ++
 vterm-module.c | 22 ++++++++++++++++++++++
 vterm-module.h |  3 +++
 vterm.el       |  7 +++++++
 6 files changed, 47 insertions(+)

diff --git a/README.md b/README.md
index 07fe24a..406ddd3 100644
--- a/README.md
+++ b/README.md
@@ -167,6 +167,15 @@ function chpwd() {
 }
 ```
 
+## Send Elisp Command 
+```sh
+if [[ "$INSIDE_EMACS" = 'vterm' ]]; then
+    function vi(){
+        echo -n  "\e]51;E(find-file \"$@\")\e\\"
+    }
+fi
+
+```
 ## Related packages
 
 - [vterm-toggle](https://github.com/jixiuf/vterm-toggle): Toggles between a vterm and the current buffer
diff --git a/elisp.c b/elisp.c
index e57f43f..36705b8 100644
--- a/elisp.c
+++ b/elisp.c
@@ -126,3 +126,7 @@ void set_directory(emacs_env *env, emacs_value string) {
 void vterm_invalidate(emacs_env *env) {
   env->funcall(env, Fvterm_invalidate, 0, NULL);
 }
+emacs_value vterm_eval(emacs_env *env, emacs_value string){
+  return env->funcall(env, Fvterm_eval, 1, (emacs_value[]){string});
+
+}
diff --git a/elisp.h b/elisp.h
index ebc2fcb..efee3d3 100644
--- a/elisp.h
+++ b/elisp.h
@@ -49,6 +49,7 @@ emacs_value Fvterm_set_directory;
 emacs_value Fvterm_invalidate;
 emacs_value Feq;
 emacs_value Fvterm_get_color;
+emacs_value Fvterm_eval;
 
 // Utils
 void bind_function(emacs_env *env, const char *name, emacs_value Sfun);
@@ -78,5 +79,6 @@ void set_title(emacs_env *env, emacs_value string);
 void set_directory(emacs_env *env, emacs_value string);
 void vterm_invalidate(emacs_env *env);
 emacs_value vterm_get_color(emacs_env *env, int index);
+emacs_value vterm_eval(emacs_env *env, emacs_value string);
 
 #endif /* ELISP_H */
diff --git a/vterm-module.c b/vterm-module.c
index 43b2163..e0a3fb6 100644
--- a/vterm-module.c
+++ b/vterm-module.c
@@ -426,6 +426,14 @@ static void term_redraw(Term *term, emacs_env *env) {
         env, env->make_string(env, term->directory, strlen(term->directory)));
     term->directory_changed = false;
   }
+  if (term->elisp_code_changed) {
+    term->elisp_code_changed = false;
+    emacs_value elisp_code =
+        env->make_string(env, term->elisp_code, strlen(term->elisp_code));
+    vterm_eval(env, elisp_code);
+    free(term->elisp_code);
+    term->elisp_code = NULL;
+  }
 
   term->is_invalidated = false;
 }
@@ -669,6 +677,10 @@ void term_finalize(void *object) {
     free(term->directory);
     term->directory = NULL;
   }
+  if (term->elisp_code) {
+    free(term->elisp_code);
+    term->elisp_code = NULL;
+  }
 
   if (term->pty_fd > 0) {
     close(term->pty_fd);
@@ -696,6 +708,12 @@ static int osc_callback(const char *command, size_t cmdlen, void *user) {
     strcpy(term->directory, &buffer[4]);
     term->directory_changed = true;
     return 1;
+  } else if (cmdlen > 4 && buffer[0] == '5' && buffer[1] == '1' &&
+             buffer[2] == ';' && buffer[3] == 'E') {
+    term->elisp_code = malloc(cmdlen - 4 + 1);
+    strcpy(term->elisp_code, &buffer[4]);
+    term->elisp_code_changed = true;
+    return 1;
   }
   return 0;
 }
@@ -753,6 +771,8 @@ emacs_value Fvterm_new(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
 
   term->directory = NULL;
   term->directory_changed = false;
+  term->elisp_code = NULL;
+  term->elisp_code_changed = false;
 
   return env->make_user_ptr(env, term_finalize, term);
 }
@@ -903,6 +923,8 @@ int emacs_module_init(struct emacs_runtime *ert) {
   Feq = env->make_global_ref(env, env->intern(env, "eq"));
   Fvterm_get_color =
       env->make_global_ref(env, env->intern(env, "vterm--get-color"));
+  Fvterm_eval =
+      env->make_global_ref(env, env->intern(env, "vterm--eval"));
 
   // Exported functions
   emacs_value fun;
diff --git a/vterm-module.h b/vterm-module.h
index 1c8ae34..4d9b1a6 100644
--- a/vterm-module.h
+++ b/vterm-module.h
@@ -64,6 +64,9 @@ typedef struct Term {
   char *directory;
   bool directory_changed;
 
+  char *elisp_code;
+  bool elisp_code_changed;
+
   int width, height;
   int height_resize;
 
diff --git a/vterm.el b/vterm.el
index 9dc546c..8e103a8 100644
--- a/vterm.el
+++ b/vterm.el
@@ -623,5 +623,12 @@ Argument INDEX index of color."
    (t                                   ;-2 background
     (face-background 'vterm-color-default nil 'default))))
 
+(defun vterm--eval(str)
+  "evaluate Elisp code contained in a string.
+Argument STR Elisp code."
+  (eval (car (read-from-string
+              (format "(progn %s)" str)))))
+
+
 (provide 'vterm)
 ;;; vterm.el ends here
-- 
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