From 521316d09b39a410d7e797efa176371e31a3a57e Mon Sep 17 00:00:00 2001
From: BanceDev
Date: Mon, 9 Sep 2024 16:17:08 -0400
Subject: add aliasing to init.lua

---
 src/lua_api.c |  9 +++++++
 src/lush.c    | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 src/lush.h    |  3 +++
 3 files changed, 89 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/lua_api.c b/src/lua_api.c
index 2f967e6..21f5d39 100644
--- a/src/lua_api.c
+++ b/src/lua_api.c
@@ -325,6 +325,13 @@ static int l_set_prompt(lua_State *L) {
 	return 0;
 }
 
+static int l_alias(lua_State *L) {
+	const char *alias = luaL_checkstring(L, 1);
+	const char *command = luaL_checkstring(L, 2);
+	lush_add_alias(alias, command);
+	return 0;
+}
+
 // -- register Lua functions --
 
 void lua_register_api(lua_State *L) {
@@ -361,6 +368,8 @@ void lua_register_api(lua_State *L) {
 	lua_setfield(L, -2, "unsetenv");
 	lua_pushcfunction(L, l_set_prompt);
 	lua_setfield(L, -2, "setPrompt");
+	lua_pushcfunction(L, l_alias);
+	lua_setfield(L, -2, "alias");
 	// set the table as global
 	lua_setglobal(L, "lush");
 }
diff --git a/src/lush.c b/src/lush.c
index 83b5f08..bd8d4e8 100644
--- a/src/lush.c
+++ b/src/lush.c
@@ -16,6 +16,7 @@ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 #include "lush.h"
+#include "hashmap.h"
 #include "help.h"
 #include "history.h"
 #include "lauxlib.h"
@@ -43,6 +44,20 @@ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 // initialize prompt format
 char *prompt_format = NULL;
 
+// -- aliasing --
+hashmap_t *aliases = NULL;
+
+void lush_add_alias(const char *alias, const char *command) {
+	// make a new map if one doesnt exist
+	if (aliases == NULL) {
+		aliases = hm_new_hashmap();
+	}
+
+	hm_set(aliases, (char *)alias, (char *)command);
+}
+
+char *lush_get_alias(char *alias) { return hm_get(aliases, alias); }
+
 // -- builtin functions --
 char *builtin_strs[] = {"cd", "help", "exit", "time"};
 
@@ -196,7 +211,8 @@ static char *format_prompt_string(const char *input, const char *username,
 	// Allocate memory for the new string
 	char *result = (char *)malloc(new_size);
 	if (!result) {
-		return NULL; // Handle memory allocation failure
+		perror("malloc failed");
+		return NULL;
 	}
 
 	// Replace placeholders in the input string and build the result string
@@ -260,6 +276,7 @@ static char *get_prompt() {
 	free(cwd);
 	return prompt;
 }
+
 size_t get_stripped_length(const char *str) {
 	size_t len = 0;
 	size_t i = 0;
@@ -471,6 +488,60 @@ char *lush_read_line() {
 	return buffer;
 }
 
+// -- static helper for resolving aliases --
+static char *lush_resolve_aliases(char *line) {
+	// Allocate memory for the new string
+	char *result = (char *)malloc(BUFFER_SIZE);
+	if (!result) {
+		perror("malloc failed");
+		return NULL;
+	}
+
+	// Create a copy of the input line for tokenization
+	char *line_copy = strdup(line);
+	if (!line_copy) {
+		perror("strdup failed");
+		free(result);
+		return NULL;
+	}
+
+	// Start building the result string
+	char *dest = result;
+	char *arg = strtok(line_copy, " ");
+	while (arg != NULL) {
+		// Check shell aliases
+		if (aliases != NULL) {
+			char *alias = hm_get(aliases, arg);
+			if (alias != NULL) {
+				// Replace alias
+				strcpy(dest, alias);
+				dest += strlen(alias);
+			} else {
+				// No alias found, use the original token
+				strcpy(dest, arg);
+				dest += strlen(arg);
+			}
+		} else {
+			// No aliases set, just use the original token
+			strcpy(dest, arg);
+			dest += strlen(arg);
+		}
+
+		// Add a space after each token (if it's not the last one)
+		arg = strtok(NULL, " ");
+		if (arg != NULL) {
+			*dest++ = ' ';
+		}
+	}
+
+	*dest = '\0'; // Null-terminate the result string
+
+	// Clean up
+	free(line_copy);
+
+	return result;
+}
+
 char **lush_split_pipes(char *line) {
 	char **commands = calloc(16, sizeof(char *));
 	if (!commands) {
@@ -685,7 +756,6 @@ int lush_run(lua_State *L, char ***commands, int num_commands) {
 			return ((*builtin_func[i])(L, commands));
 		}
 	}
-
 	return lush_execute_pipeline(commands, num_commands);
 }
 
@@ -722,7 +792,8 @@ int main(int argc, char *argv[]) {
 			free(line);
 			continue;
 		}
-		char **commands = lush_split_pipes(line);
+		char *expanded_line = lush_resolve_aliases(line);
+		char **commands = lush_split_pipes(expanded_line);
 		char ***args = lush_split_args(commands, &status);
 		if (status == -1) {
 			fprintf(stderr, "lush: Expected end of quoted string\n");
@@ -737,11 +808,13 @@ int main(int argc, char *argv[]) {
 		free(prompt);
 		free(args);
 		free(commands);
+		free(expanded_line);
 		free(line);
 	}
 	lua_close(L);
 	if (prompt_format != NULL)
 		free(prompt_format);
-
+	if (aliases != NULL)
+		free(aliases);
 	return 0;
 }
diff --git a/src/lush.h b/src/lush.h
index ea575c7..27cf5db 100644
--- a/src/lush.h
+++ b/src/lush.h
@@ -20,6 +20,9 @@ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 
 #include <lua.h>
 
+void lush_add_alias(const char *alias, const char *command);
+char *lush_get_alias(char *alias);
+
 int lush_cd(lua_State *L, char ***args);
 int lush_help(lua_State *L, char ***args);
 int lush_exit(lua_State *L, char ***args);
-- 
cgit v1.2.3-59-g8ed1b