night0721/90s
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

history navigation by !!

Browse source
This commit is contained in:
Night Kaly 2024-02-08 19:49:11 +00:00
parent 9b27891d43
commit 0a8d3ca51c
No known key found for this signature in database
GPG key ID: 8E829D3381CFEBBE
5 changed files with 181 additions and 118 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
commands.c
View file

@ -6,11 +6,12 @@
#include <errno.h>
#include <sys/wait.h>
#include "commands.h"
#include "constants.h"
#include "history.h"
#include "rush.h"
int execute(char **args);
// Function declarations for builtin commands
int cd(char **args);
int help(char **args);
@ -81,7 +82,7 @@ int quit(char **args) {
}
int history(char **args) {
char **history = get_all_history();
char **history = get_all_history(true);
for (int i = 0; history[i] != NULL; ++i) {
printf("%s\n", history[i]);
@ -158,17 +159,24 @@ int execute(char **args) {
return 1;
}
save_command_history(args); // save command to history file
// prioritize builtin commands
for (int i = 0; i < num_builtins(); i++) {
if (strcmp(args[0], builtin_cmds[i]) == 0) {
return (*builtin_func[i])(args);
}
}
/*
while (*args) {
int num_arg = 0;
while (*args != NULL) {
num_arg++; // count number of args
args++;
}
*/
args -= num_arg;
pid_t pid;
int status;

73
history.c
View file

@ -1,9 +1,11 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
#include "history.h"
#include "constants.h"
FILE *history_file;
@ -45,36 +47,26 @@ void check_history_file() {
}
}
void save_command_history(char *command) {
void save_command_history(char **args) {
history_file = fopen(histfile_path, "a+");
if (history_file == NULL) {
fprintf(stderr, "rush: Error opening history file\n");
exit(EXIT_FAILURE);
}
int cmd_len = strlen(command);
command[cmd_len] = '\n'; // put new line feed to split commands
char cmd[RL_BUFSIZE];
cmd[0] = '\0';
for (int i = 0; args[i] != NULL; ++i) {
strcat(cmd, args[i]);
strcat(cmd, " ");
}
int cmd_len = strlen(cmd);
cmd[cmd_len] = '\n'; // put new line feed to split commands
// ptr to first obj, size of each obj, number of obj, file ptr
fwrite(command, sizeof(char), cmd_len + 1, history_file);
fwrite(cmd, sizeof(char), cmd_len + 1, history_file);
fclose(history_file);
}
char *read_command(int direction) {
history_file = fopen(histfile_path, "rb"); // read binary mode
if (history_file == NULL) {
fprintf(stderr, "rush: Error opening history file\n");
exit(EXIT_FAILURE);
}
// normal bufsize is 1024, we serach for 1025 bytes for new line feed
int search_len = RL_BUFSIZE + 1;
char search[search_len];
fseek(history_file, -search_len, SEEK_END); // go back 1025 characters from end of file
int count = fread(search, 1, search_len - 1, history_file); // try to read 1025 characters from file, returning count number of bytes
search[count] = '\0';
char *last_nlf = strrchr(search, '\n'); // locate last occurence of \n in a searching string
if (last_nlf == NULL) {
// no history
return NULL;
}
if (direction == 1) { // up
cmd_count++;
} else { // down
@ -84,24 +76,18 @@ char *read_command(int direction) {
cmd_count--;
}
}
for (int i = 0; i < cmd_count; i++) {
search[last_nlf - search] = '\0'; // terminate string earlier to find second last \n, search points to first char and last_nlf is last \n, difference is the index of \n
last_nlf = strrchr(search, '\n'); // call strrchr 2 times to get second last new line feed in search string as every life is new line feed
if ((last_nlf - search) == (strchr(search, '\n') - search)) {
// check if the first \n is the last \n we searching for, if yes it is first command
cmd_count--;
search[last_nlf - search] = '\0'; // terminate string earlier to find second last \n, search points to first char and last_nlf is last \n, difference is the index of \n
char *first_cmd = malloc(sizeof(char) * (last_nlf - search) + 1);
if (first_cmd == NULL) {
fprintf(stderr, "rush: Error allocating memory\n");
exit(EXIT_FAILURE);
char **history = get_all_history(false);
int num_history = 0;
while (*history != NULL) {
num_history++;
history++;
}
strcpy(first_cmd, search);
return first_cmd;
if (cmd_count > num_history) {
cmd_count = num_history;
return NULL;
}
}
fclose(history_file);
return last_nlf + 1; // return the string from the new line feed
history -= num_history;
return history[num_history - cmd_count];
}
int is_duplicate(char **history, int line_count, char *line) {
@ -113,7 +99,7 @@ int is_duplicate(char **history, int line_count, char *line) {
return 0;
}
char **get_all_history() {
char **get_all_history(bool check) {
history_file = fopen(histfile_path, "r");
if (history_file == NULL) {
fprintf(stderr, "rush: Error opening history file\n");
@ -130,6 +116,7 @@ char **get_all_history() {
while (fgets(buffer, sizeof(buffer), history_file) != NULL) {
buffer[strcspn(buffer, "\n")] = '\0';
if (check) {
if (!is_duplicate(history, line_count, buffer)) {
history[line_count] = strdup(buffer);
if (history[line_count] == NULL) {
@ -142,6 +129,18 @@ char **get_all_history() {
exit(EXIT_FAILURE);
}
}
} else {
history[line_count] = strdup(buffer);
if (history[line_count] == NULL) {
fprintf(stderr, "Error allocating memory\n");
exit(EXIT_FAILURE);
}
line_count++;
if (line_count >= MAX_HISTORY) {
fprintf(stderr, "Maximum number of lines reached.\n");
exit(EXIT_FAILURE);
}
}
}
fclose(history_file);

4
history.h
View file

@ -1,9 +1,9 @@
#ifndef HISTORY_H_
#define HISTORY_H_
void save_command_history(char *command);
void save_command_history(char **args);
void check_history_file();
char *read_command(int direction);
char **get_all_history();
char **get_all_history(bool check);
#endif

350
rush.c
View file

@ -69,7 +69,7 @@ char **setup_path_variable() {
}
bool find_command(char **paths, char *command) {
if (strcmp(command, "") == 0) {
if (strncmp(command, "", 1) == 0) {
return false;
}
while (*paths != NULL) {
@ -97,147 +97,11 @@ void shiftright(int chars) {
printf("\033[%dC", chars);
}
char *readline(char **paths) {
int bufsize = RL_BUFSIZE;
int position = 0;
char *buffer = malloc(sizeof(char) * bufsize);
bool moved = false;
bool backspaced = false;
bool navigated = false;
bool insertatmiddle = false;
if (!buffer) {
fprintf(stderr, "rush: Error allocating memory\n");
exit(EXIT_FAILURE);
}
buffer[0] = '\0';
while (1) {
int c = getchar(); // read a character
int buf_len = strlen(buffer);
// check each character user has input
switch (c) {
case EOF:
exit(EXIT_SUCCESS);
case 10: {
// enter/new line feed
if (buf_len == 0) {
break;
}
buffer[buf_len] = '\0';
// clear all characters after the command
for (int start = buf_len + 1; buffer[start] != '\0'; start++) {
buffer[start] = '\0';
}
printf("\n"); // give space for response
save_command_history(buffer);
position = 0;
return buffer;
}
case 127: // backspace
if (buf_len >= 1) {
position--;
for (int i = position; i < buf_len; i++) {
// shift the buffer
buffer[i] = buffer[i + 1];
}
backspaced = true;
moved = false;
}
break;
case 27: // arrow keys comes at three characters, 27, 91, then 65-68
if (getchar() == 91) {
int arrow_key = getchar();
if (arrow_key == 65) { // up
// read history file and fill prompt with latest command
char *last_command = read_command(1);
if (last_command != NULL) {
strcpy(buffer, last_command);
navigated = true;
}
moved = false;
break;
} else if (arrow_key == 66) { // down
char *last_command = read_command(0);
if (last_command != NULL) {
strcpy(buffer, last_command);
navigated = true;
}
moved = false;
break;
} else if (arrow_key == 67) { // right
if (position < buf_len) {
shiftright(1);
position++;
}
moved = true;
break;
} else if (arrow_key == 68) { // left
if (position >= 1) {
shiftleft(1);
position--;
}
moved = true;
break;
}
}
default:
if (c > 31 && c < 127) {
if (position == buf_len) {
// Append character to the end of the buffer
buffer[buf_len] = c;
buffer[buf_len + 1] = '\0';
moved = false;
navigated = false;
} else {
// Insert character at the current position
memmove(&buffer[position + 1], &buffer[position], buf_len - position + 1);
buffer[position] = c;
shiftright(1);
insertatmiddle = true;
}
position++;
}
}
if (navigated && buf_len >= 1) {
if (position != 0) {
shiftleft(buf_len); // move cursor to the beginning
void clearline() {
printf("\033[K"); // clear line to the right of cursor
}
}
buf_len = strlen(buffer);
if (moved) {
moved = false;
continue;
}
if (!navigated) {
if (position != buf_len) {
// not at normal place
if (backspaced) {
shiftleft(position + 1);
} else {
shiftleft(position); // move cursor to the beginning
}
} else if (buf_len > 1) {
if (backspaced) {
shiftleft(buf_len + 1); // move cursor to the beginning
} else {
shiftleft(buf_len - 1); // move cursor to the beginning
}
} else if (buf_len == 1) {
if (backspaced) {
shiftleft(2);
}
} else if (buf_len == 0) {
if (backspaced) {
shiftleft(1);
}
}
printf("\033[K"); // clear line to the right of cursor
} else {
navigated = false;
}
}
void highlight(char *buffer, char **paths) {
char *cmd_part = strchr(buffer, ' ');
char *command_without_arg = NULL;
int cmd_len = 0;
@ -281,6 +145,186 @@ char *readline(char **paths) {
}
}
free(command_without_arg);
}
char *readline(char **paths) {
int bufsize = RL_BUFSIZE;
int position = 0;
char *buffer = malloc(sizeof(char) * bufsize);
bool moved = false;
bool backspaced = false;
bool navigated = false;
bool insertatmiddle = false;
bool replaced = false;
if (!buffer) {
fprintf(stderr, "rush: Error allocating memory\n");
exit(EXIT_FAILURE);
}
buffer[0] = '\0';
while (1) {
int c = getchar(); // read a character
int buf_len = strlen(buffer);
// check each character user has input
switch (c) {
case EOF:
exit(EXIT_SUCCESS);
case 10: {
// enter/new line feed
if (buf_len == 0) {
break;
}
// check if command includes !!
if (strstr(buffer, "!!") != NULL) {
char *last_command = read_command(1);
if (last_command != NULL) {
// replace !! with the last command
char *replace = strstr(buffer, "!!");
int replace_len = strlen(replace);
int last_command_len = strlen(last_command);
int buffer_len = strlen(buffer);
if (last_command_len > replace_len) {
buffer = realloc(buffer, buffer_len + last_command_len - replace_len + 1);
if (!buffer) {
fprintf(stderr, "rush: Error allocating memory\n");
exit(EXIT_FAILURE);
}
}
memmove(replace + last_command_len, replace + replace_len, buffer_len - (replace - buffer) - replace_len + 1);
memcpy(replace, last_command, last_command_len);
position += last_command_len - replace_len;
shiftright(last_command_len - replace_len);
replaced = true;
break;
}
} else {
buffer[buf_len] = '\0';
// clear all characters after the command
for (int start = buf_len + 1; buffer[start] != '\0'; start++) {
buffer[start] = '\0';
}
printf("\n"); // give space for response
position = 0;
return buffer;
}
}
case 127: // backspace
if (buf_len >= 1) {
position--;
for (int i = position; i < buf_len; i++) {
// shift the buffer
buffer[i] = buffer[i + 1];
}
backspaced = true;
moved = false;
}
break;
case 27: // arrow keys comes at three characters, 27, 91, then 65-68
if (getchar() == 91) {
int arrow_key = getchar();
if (arrow_key == 65) { // up
// read history file and fill prompt with latest command
char *last_command = read_command(1);
if (last_command != NULL) {
strcpy(buffer, last_command);
}
navigated = true;
moved = false;
break;
} else if (arrow_key == 66) { // down
char *last_command = read_command(0);
if (last_command != NULL) {
strcpy(buffer, last_command);
}
navigated = true;
moved = false;
break;
} else if (arrow_key == 67) { // right
if (position < buf_len) {
shiftright(1);
position++;
}
moved = true;
break;
} else if (arrow_key == 68) { // left
if (position >= 1) {
shiftleft(1);
position--;
}
moved = true;
break;
}
}
default:
if (c > 31 && c < 127) {
if (position == buf_len) {
// Append character to the end of the buffer
buffer[buf_len] = c;
buffer[buf_len + 1] = '\0';
moved = false;
navigated = false;
} else {
// Insert character at the current position
memmove(&buffer[position + 1], &buffer[position], buf_len - position + 1);
buffer[position] = c;
shiftright(1);
insertatmiddle = true;
}
position++;
}
}
buf_len = strlen(buffer);
if (replaced) {
shiftleft(buf_len);
clearline();
}
if (navigated && buf_len >= 1) {
if (position > 0) {
shiftleft(position); // move cursor to the beginning
clearline();
}
position = buf_len;
}
if (moved) {
moved = false;
continue;
}
if (!navigated && !replaced) {
if (position != buf_len) {
// not at normal place
if (backspaced) {
shiftleft(position + 1);
} else {
shiftleft(position); // move cursor to the beginning
}
} else if (buf_len > 1) {
if (backspaced) {
shiftleft(buf_len + 1); // move cursor to the beginning
} else {
shiftleft(buf_len - 1); // move cursor to the beginning
}
} else if (buf_len == 1) {
if (backspaced) {
shiftleft(2);
}
} else if (buf_len == 0) {
if (backspaced) {
shiftleft(1);
}
}
clearline();
} else {
navigated = false;
}
highlight(buffer, paths);
if (backspaced) {
if (buf_len != position) {
@ -291,8 +335,11 @@ char *readline(char **paths) {
if (insertatmiddle) {
shiftleft(buf_len - position); // move cursor back to where it was
insertatmiddle = false;
}
if (replaced) {
replaced = false;
}
// If we have exceeded the buffer, reallocate.
if ((buf_len + 1) >= bufsize) {
bufsize += RL_BUFSIZE;
@ -332,15 +379,23 @@ char **argsplit(char *line) {
token = strtok(NULL, TOK_DELIM);
}
// makes ls and diff have color without user typing it
if (strcmp(tokens[0], "ls") == 0 || strcmp(tokens[0], "diff") == 0) {
tokens[position] = "--color=auto";
}
position++;
tokens[position] = NULL;
return tokens;
}
char **modifyargs(char **args) {
int num_arg = 0;
// makes ls and diff have color without user typing it
if (strncmp(args[0], "ls", 2) == 0 || strncmp(args[0], "diff", 4) == 0) {
args[num_arg] = "--color=auto";
num_arg++;
args[num_arg] = NULL;
}
return args;
}
// continously prompt for command and execute it
void command_loop(char **paths) {
char *line;
@ -371,6 +426,7 @@ void command_loop(char **paths) {
line = readline(paths);
args = argsplit(line);
args = modifyargs(args);
status = execute(args);
free(line);

2
rush.h
View file

@ -1,6 +1,6 @@
#ifndef RUSH_H_
#define RUSH_H_
char **argsplit(char * line);
char **argsplit(char *line);
#endif