- readme. todo

- update pwd
- update SHLVL
- basename pwd in prompt
  - updating pwd

README.md

@@ -0,0 +1,18 @@
+# todo
+
+- [x] environment variables
+- [x] custom prompts
+- [x] minimal current directory
+- [ ] quotes
+- [-] handle ~
+- [ ] dynamically allocate cwd in cd builtin command
+- [-] all of posixs
+  - [ ] aliases
+  - [x] increase the SHLVL var
+  - [x] update pwd
+  - [ ] pipes |
+  - [ ] redirections > <
+  - [ ] append >>
+  - [ ] heredoc
+- [ ] rcfile
+  - [ ] rcfile in homedir

src/helper_functions.c

@@ -1,6 +1,8 @@
 #ifndef shell_helper_functions
 #define shell_helper_functions
 
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -51,4 +53,38 @@ char *str_replace(char *orig, char *rep, char *with) {
     return result;
 }
 
+char *basename(char *path_in) 
+{
+    char *token = NULL;
+    char *lastToken = NULL;
+    char *basePath;
+
+    basePath = (char *)malloc(sizeof(char) * (strlen(path_in) + 1));
+    if (!basePath) {
+        fprintf(stderr, "lsh: allocatin error\n");
+        exit(EXIT_FAILURE);
+    }
+    strcpy(basePath, path_in);
+
+    token = strtok(basePath, "/");
+    while (token != NULL) {
+        lastToken = token;
+        token = strtok(NULL, "/");
+    }
+
+    if (lastToken == NULL){
+        free(basePath);
+        return NULL;
+    }
+
+    char *ret_str = (char*)malloc(sizeof(char)*strlen(lastToken)+1);
+    if (!ret_str) {
+        fprintf(stderr, "lsh: allocation error\n");
+        exit(EXIT_FAILURE);
+    }
+    strcpy(ret_str,lastToken);
+    free(basePath);
+    return ret_str;
+}
+
 #endif

src/lsh_builtins.c

@@ -44,9 +44,18 @@ int lsh_cd(char **args)
     if (args[1] == NULL) {
         fprintf(stderr, "lsh: expected argument to \"cd\"\n");
     } else {
-        if (chdir(args[1]) != 0) {
+        int err = chdir(args[1]);
+        if (err != 0) {
             perror("lsh");
         }
+        char *cwd=(char*)malloc(sizeof(char)*4096);
+        if (!cwd) {
+            fprintf(stderr, "lsh: allocation error\n");
+            exit(EXIT_FAILURE);
+        }
+        getcwd(cwd,sizeof(char*)*4096);
+        setenv("PWD",cwd,1);
+        free(cwd);
     }
     return 1;
 }
@@ -54,7 +63,7 @@ int lsh_cd(char **args)
 int lsh_help(char **args)
 {
     int i;
-    printf("Stephen Brennan's LSH\n");
+    printf("FOX SHELL\n");
     printf("Type program names and arguments, and hit enter.\n");
     printf("The following are built in:\n");
 

src/lsh_main_func.c

@@ -46,10 +46,12 @@ char *lsh_read_line(void)
 }
 
 char *handle_vars(char *token){
+    token=&token[0];
     if (token[0] == '$'){
         token=&token[1];
         token=getenv(token);
     }
+
     return token;
 }
 

src/main.c

@@ -2,11 +2,13 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+#include "helper_functions.c"
 #include "lsh_main_func.c"
 #include "lsh_builtins.c"
 
 typedef struct{
     char *prompt;
+    char *pre_prompt;
 } SHELL_OB;
 
 void lsh_loop(SHELL_OB *shell_obj)
@@ -16,6 +18,11 @@ void lsh_loop(SHELL_OB *shell_obj)
     int status;
 
     do {
+        //get pwd
+        char *cwd= getenv("PWD");
+        char *pwd=basename(cwd);
+        snprintf(shell_obj->prompt,sizeof(char) * 1024,"%s %s> ",shell_obj->pre_prompt,pwd);
+        free(pwd);
         printf("%s",shell_obj->prompt);
         line = lsh_read_line();
         args = lsh_split_line(line);
@@ -27,18 +34,43 @@ void lsh_loop(SHELL_OB *shell_obj)
 }
 
 int main(int argc, char **argv){
+    //set sh level
+    char *shlvl = getenv("SHLVL");
+    if(shlvl != NULL){
+        int shlvli = atoi(shlvl);
+        shlvli++;
+        sprintf(shlvl,"%d",shlvli);
+        setenv("SHLVL",shlvl,1);
+    }
+
+    //Set The prompt
     SHELL_OB shell_obj;
     shell_obj.prompt = (char *)malloc(sizeof(char) * 1024);
+    if (!shell_obj.prompt){
+        fprintf(stderr, "lsh: allocation error\n");
+        exit(EXIT_FAILURE);
+    }
+    shell_obj.pre_prompt = (char *)malloc(sizeof(char) * 1024);
+    if (!shell_obj.pre_prompt){
+        fprintf(stderr, "lsh: allocation error\n");
+        exit(EXIT_FAILURE);
+    }
 
     //get the hostname
     char *hostname = (char *)malloc(sizeof(char) * 1024);
+    if (!hostname) {
+        fprintf(stderr, "lsh: allocation error\n");
+        exit(EXIT_FAILURE);
+    }
     gethostname(hostname,sizeof(char) * 1024);
 
-    snprintf(shell_obj.prompt,sizeof(char) * 1024,"%s@%s> ",getenv("USER"),hostname);
+    //set the pre_prompt
+    snprintf(shell_obj.pre_prompt,sizeof(char) * 1024,"%s@%s",getenv("USER"),hostname);
+    free(hostname);
 
     lsh_loop(&shell_obj);
 
-    free(hostname);
     free(shell_obj.prompt);
+    free(shell_obj.pre_prompt);
     return EXIT_SUCCESS;
 }