From 17aadc35445c08572edcc9df826ade5d74cb4e17 Mon Sep 17 00:00:00 2001
From: BanceDev
Date: Thu, 13 Feb 2025 11:56:52 -0500
Subject: added ability to configure alternate shell

---
 src/lua_api.c | 16 ++++++++++++++++
 src/lush.c    | 28 ++++++++++++++++++++++++++--
 src/lush.h    |  2 +-
 3 files changed, 43 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/lua_api.c b/src/lua_api.c
index ae5decf..a35a308 100644
--- a/src/lua_api.c
+++ b/src/lua_api.c
@@ -33,6 +33,7 @@ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 // globals
 static bool debug_mode = false;
 bool suggestion_enable = true;
+char *alt_shell;
 
 // -- script execution --
 int lua_load_script(lua_State *L, const char *script, char **args) {
@@ -422,6 +423,19 @@ static int l_exit(lua_State *L) {
 	return 0;
 }
 
+static int l_alt_shell(lua_State *L) {
+	const char *alt = luaL_checkstring(L, 1);
+
+	free(alt_shell);
+	alt_shell = strdup(alt);
+
+	if (!alt_shell) {
+		return luaL_error(L, "Memory allocation failed");
+	}
+
+	return 1;
+}
+
 // -- register Lua functions --
 
 void lua_register_api(lua_State *L) {
@@ -470,6 +484,8 @@ void lua_register_api(lua_State *L) {
 	lua_setfield(L, -2, "glob");
 	lua_pushcfunction(L, l_exit);
 	lua_setfield(L, -2, "exit");
+	lua_pushcfunction(L, l_alt_shell);
+	lua_setfield(L, -2, "altShell");
 	// set the table as global
 	lua_setglobal(L, "lush");
 }
diff --git a/src/lush.c b/src/lush.c
index f815fa5..1c42139 100644
--- a/src/lush.c
+++ b/src/lush.c
@@ -1390,6 +1390,21 @@ int lush_execute_pipeline(char ***commands, int num_commands) {
 	return 0;
 }
 
+static void build_alt_command(char *buffer, char **args) {
+	size_t offset = 0;
+
+	for (int i = 0; args[i]; i++) {
+		if (offset + strlen(args[i]) + 1 < BUFFER_SIZE) {
+			strcat(buffer, args[i]);
+			strcat(buffer, " ");
+			offset = strlen(buffer);
+		} else {
+			fprintf(stderr, "command too long\n");
+			exit(EXIT_FAILURE);
+		}
+	}
+}
+
 int lush_execute_command(char **args, int input_fd, int output_fd) {
 	// create child
 	pid_t pid;
@@ -1419,8 +1434,15 @@ int lush_execute_command(char **args, int input_fd, int output_fd) {
 
 		// execute the command
 		if (execvp(args[0], args) == -1) {
-			perror("execvp");
-			exit(EXIT_FAILURE);
+			if (alt_shell) {
+				char command[BUFFER_SIZE] = {0};
+				build_alt_command(command, args);
+				execlp(alt_shell, alt_shell, "-c", command, (char *)NULL);
+				perror("alt shell");
+			} else {
+				perror("lush");
+				exit(EXIT_FAILURE);
+			}
 		}
 	} else if (pid < 0) {
 		// forking failed
@@ -1592,5 +1614,7 @@ int main(int argc, char *argv[]) {
 		free(prompt_format);
 	if (aliases != NULL)
 		free(aliases);
+	if (alt_shell != NULL)
+		free(alt_shell);
 	return 0;
 }
diff --git a/src/lush.h b/src/lush.h
index 9ca9722..139f638 100644
--- a/src/lush.h
+++ b/src/lush.h
@@ -55,9 +55,9 @@ int lush_execute_chain(lua_State *L, char ***commands, int num_commands);
 
 void lush_format_prompt(const char *prompt_format);
 
-// enable for autocomplete text set in init.lua
 // initialized in the lua_api
 extern bool suggestion_enable;
+extern char *alt_shell;
 
 // format spec for the prompt
 extern char *prompt_format;
-- 
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