initial commit

main.c

@@ -0,0 +1,146 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+struct file {
+	struct file *next;
+	char *name;
+	char *newname;
+};
+
+int main(int argc, char *argv[]) {
+	char *dirname = ".";
+	if (argc > 1) {
+		if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
+			printf("Usage: %s [-h] [directory]\n", argv[0]);
+			exit(0);
+		}
+		dirname = argv[1];
+	}
+	DIR *dir = opendir(dirname);
+	if (!dir) {
+		perror("opendir");
+		exit(1);
+	}
+	int fd = dirfd(dir);
+	fchdir(fd);
+	struct file *begin = NULL;
+	struct file **cur = &begin;
+	while (1) {
+		errno = 0;
+		struct dirent *entry = readdir(dir);
+		if (!entry) {
+			if (errno != 0) {
+				perror("readdir");
+				exit(1);
+			}
+			break;
+		}
+
+		if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
+			continue;
+
+		*cur = malloc(sizeof(struct file));
+		if (!*cur) {
+			perror("malloc");
+			exit(1);
+		}
+		(*cur)->name = strdup(entry->d_name);
+		(*cur)->newname = NULL;
+		cur = &(*cur)->next;
+	}
+
+	if (!begin) {
+		exit(0);
+	}
+
+	char template[] = "/tmp/vidir-c.XXXXXX";
+	if (!mkstemp(template)) {
+		perror("mkstemp");
+		exit(1);
+	}
+
+	FILE *tempfile = fopen(template, "w+");
+	if (!tempfile) {
+		perror("fopen");
+		exit(1);
+	}
+
+	int i = 1;
+	for (struct file *file = begin; file; file = file->next) {
+		fprintf(tempfile, "%d %s\n", i, file->name);
+		i ++;
+	}
+	fflush(tempfile);
+
+	pid_t pid = fork();
+	if (pid == -1) {
+		perror("fork");
+		exit(1);
+	}
+	if (pid == 0) {
+		char *editor = getenv("EDITOR");
+		if (!editor)
+			editor = "nano";
+
+		execlp(editor, editor, template, (char *) NULL);
+
+		perror("execlp");
+		exit(1);
+	}
+
+	wait(NULL);
+
+	fseek(tempfile, 0, SEEK_SET);
+
+	ssize_t nread;
+	char *line = NULL;
+	size_t n;
+	while ((nread = getline(&line, &n, tempfile)) != -1) {
+		line[nread - 1] = '\0';
+
+		char *endptr = NULL;
+		long num = strtol(line, &endptr, 10);
+
+		if (line == endptr)
+			continue;
+
+		if (*endptr != ' ')
+			continue;
+
+		char *filename = endptr + 1;
+
+		struct file *file = begin;
+		int i = 1;
+		while (file && i ++ < num)
+			file = file->next;
+
+		if (!file)
+			continue;
+
+		file->newname = strdup(filename);
+	}
+
+	for (struct file *file = begin; file; file = file->next) {
+		if (!file->newname) {
+			printf("Delete: %s\n", file->name);
+			remove(file->name);
+			continue;
+		}
+		if (strcmp(file->name, file->newname) != 0) {
+			printf("Rename: %s to %s\n", file->name, file->newname);
+			rename(file->name, file->newname);
+			continue;
+		}
+	}
+
+	unlink(template);
+	exit(0);
+}