101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#define STRINGIFY(x) #x
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#define TOSTRING(x) STRINGIFY(x)
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inline int termux_min3(unsigned int a, unsigned int b, unsigned int c) {
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return (a < b ? (a < c ? a : c) : (b < c ? b : c));
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}
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int termux_levenshtein_distance(char const* restrict s1, char const* restrict s2) {
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unsigned int s1len = strlen(s1);
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unsigned int s2len = strlen(s2);
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unsigned int matrix[s2len+1][s1len+1];
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matrix[0][0] = 0;
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for (unsigned x = 1; x <= s2len; x++)
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matrix[x][0] = matrix[x-1][0] + 1;
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for (unsigned y = 1; y <= s1len; y++)
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matrix[0][y] = matrix[0][y-1] + 1;
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for (unsigned x = 1; x <= s2len; x++)
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for (unsigned y = 1; y <= s1len; y++)
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matrix[x][y] = termux_min3(matrix[x-1][y] + 1, matrix[x][y-1] + 1, matrix[x-1][y-1] + (s1[y-1] == s2[x-1] ? 0 : 1));
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return matrix[s2len][s1len];
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}
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int main(int argc, char** argv) {
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if (argc != 2) {
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fprintf(stderr, "usage: termux-command-not-found <command>\n");
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return 1;
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}
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char* command_not_found = argv[1];
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FILE* commands_file = fopen(TOSTRING(TERMUX_COMMANDS_LISTING), "r");
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if (commands_file == NULL) {
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perror(TOSTRING(TERMUX_COMMANDS_LISTING));
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return 1;
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}
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int best_distance = -1;
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int guesses_at_best_distance = 0;
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char current_package[128];
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char best_package_guess[128];
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char best_command_guess[128];
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char* current_line = NULL;
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while (true) {
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size_t buffer_length = sizeof(current_line);
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ssize_t read_bytes = getline(¤t_line, &buffer_length, commands_file);
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if (read_bytes <= 1) break;
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size_t line_length = strlen(current_line);
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current_line[line_length-1] = 0;
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if (current_line[0] == ' ') { // Binary
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char* binary_name = current_line + 1;
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int distance = termux_levenshtein_distance(command_not_found, binary_name);
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if (distance == 0 && strcmp(command_not_found, binary_name) == 0) {
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printf("The program '%s' is currently not installed. You can install it by executing:\n apt install %s\n", binary_name, current_package);
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return 0;
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} else if (best_distance == distance) {
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guesses_at_best_distance++;
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} else if (best_distance == -1 || best_distance > distance) {
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guesses_at_best_distance = 0;
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best_distance = distance;
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strncpy(best_command_guess, binary_name, sizeof(best_command_guess));
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strncpy(best_package_guess, current_package, sizeof(best_package_guess));
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}
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} else { // Package
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strncpy(current_package, current_line, sizeof(current_package));
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}
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}
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if (best_distance == -1 || best_distance > 3) {
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printf("%s: command not found\n", command_not_found);
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} else {
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printf("No command '%s' found, did you mean:\n", command_not_found);
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if (guesses_at_best_distance == 1) {
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// Only one suggestion - show it:
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printf(" Command '%s' from package '%s'\n", best_command_guess, best_package_guess);
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} else {
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// Multiple suggestions at the same distance - show them all:
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rewind(commands_file);
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while (true) {
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size_t buffer_length = sizeof(current_line);
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ssize_t read_bytes = getline(¤t_line, &buffer_length, commands_file);
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if (read_bytes <= 1) break;
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size_t line_length = strlen(current_line);
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current_line[line_length-1] = 0;
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if (current_line[0] == ' ') { // Binary
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char* binary_name = current_line + 1;
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int distance = termux_levenshtein_distance(command_not_found, binary_name);
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if (best_distance == distance) {
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printf(" Command '%s' from package '%s'\n", binary_name, current_package);
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}
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} else { // Package
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strncpy(current_package, current_line, sizeof(current_package));
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}
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}
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}
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}
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}
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