feat: history file

src/ansi.h

@@ -1,4 +1,6 @@
 
+#define ANSI_ESC                      "\x1b"
+
 #define ANSI_FG_BLACK                 "\x1b[30m"
 #define ANSI_FG_RED                   "\x1b[31m"
 #define ANSI_FG_GREEN                 "\x1b[32m"

src/msh.c

@@ -8,10 +8,14 @@
 #include <sys/utsname.h>
 #include <errno.h>
 #include <termios.h>
+#include <fcntl.h>
+#include <sys/stat.h>
 
 #include "ansi.h"
 
-#define ESC \x1B
+
+#define HISTORY_FILE_NAME "/history.log"
+#define LOCAL_SHARE_DIRNAME "/.local/share/msh"
 
 
 const int LINESIZE = 512;
@@ -156,6 +160,9 @@ int main(int argc, char** argv) {
     char* host;
 
     struct utsname uts = {};
+    char* sharedir = NULL;
+    char* historyfilepath = NULL;
+    FILE* historyfile = NULL;
 
     user = secure_getenv("USER");
 
@@ -176,6 +183,68 @@ int main(int argc, char** argv) {
     // disable echo and icanon (don't wait for newline)
     term.c_lflag &= ~(ECHO | ICANON);
 
+    char* homedir = secure_getenv("HOME");
+
+    if (homedir == NULL) {
+        fprintf(stderr, "Error: $HOME is not specified\n");
+        retval = 1;
+        goto cleanup;
+    }
+
+    sharedir = malloc(strlen(homedir) + strlen(LOCAL_SHARE_DIRNAME) + 1);
+    if (sharedir == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+    sharedir = strcpy(sharedir, homedir);
+    if (sharedir == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+    sharedir = strcat(sharedir, LOCAL_SHARE_DIRNAME);
+    if (sharedir == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+
+    result = mkdir(sharedir, S_IRWXU);
+    if (result != 0 && errno != EEXIST) {
+        fprintf(stderr, "Error: %s\n", strerror(errno));
+        retval = 1;
+        goto cleanup;
+    }
+
+
+    historyfilepath = malloc(strlen(sharedir) + strlen(HISTORY_FILE_NAME) + 1);
+    if (historyfilepath == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+    historyfilepath = strcpy(historyfilepath, sharedir);
+    if (historyfilepath == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+    historyfilepath = strcat(historyfilepath, HISTORY_FILE_NAME);
+    if (historyfilepath == NULL) {
+        retval = 1;
+        goto cleanup;
+    }
+
+    int historyfilefd = open(historyfilepath, O_CREAT | O_APPEND | O_WRONLY, S_IRUSR | S_IWUSR);
+    if (historyfilefd == -1) {
+        fprintf(stderr, "Error: could not open history file: %s\n", strerror(errno));
+        retval = 1;
+        goto cleanup;
+    }
+
+    historyfile = fdopen(historyfilefd, "w");
+    if (historyfile == NULL) {
+        fprintf(stderr, "Error: could not open history file fd: %s\n", strerror(errno));
+        retval = 1;
+        goto cleanup;
+    }
+
 
     // Main loop
     while(1) {
@@ -284,9 +353,9 @@ int main(int argc, char** argv) {
 
 print_prompt:
             // Manual echo
-            printf("\x1b[2K\x1b[0G%s%s", prompt, line);
+            printf(ANSI_ESC "[2K" ANSI_ESC "[0G" "%s%s", prompt, line);
             for (int j = 0; j < linelen - cursor; j++) {
-                printf("\x1b[D");
+                printf(ANSI_ESC "[D");
             }
             fflush(stdout);
         }
@@ -297,6 +366,9 @@ print_prompt:
 
         line[linelen] = 0;
 
+        fprintf(historyfile, "%s\n", line);
+        fflush(historyfile);
+        
         // Split into tokens
         for (tokenwork = line, i = 0; ; tokenwork = NULL, i++) {
             token = strtok(tokenwork, " \t");
@@ -342,6 +414,17 @@ print_prompt:
 
 
 cleanup:
+    if (sharedir != NULL) {
+        free(sharedir);
+    }
+    if (historyfilepath != NULL) {
+        free(historyfilepath);
+    }
+
+    if (historyfile != NULL) {
+        fflush(historyfile);
+        fclose(historyfile);
+    }
     tcsetattr(fileno(stdin), 0, &orig_term);
     return retval;
 }