270 строки
5.6 KiB
C
270 строки
5.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/string.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dirent.h>
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#include "subcmd-util.h"
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#include "help.h"
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#include "exec-cmd.h"
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void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
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{
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struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
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ent->len = len;
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memcpy(ent->name, name, len);
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ent->name[len] = 0;
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ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
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cmds->names[cmds->cnt++] = ent;
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}
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void clean_cmdnames(struct cmdnames *cmds)
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{
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unsigned int i;
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for (i = 0; i < cmds->cnt; ++i)
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zfree(&cmds->names[i]);
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zfree(&cmds->names);
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cmds->cnt = 0;
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cmds->alloc = 0;
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}
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int cmdname_compare(const void *a_, const void *b_)
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{
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struct cmdname *a = *(struct cmdname **)a_;
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struct cmdname *b = *(struct cmdname **)b_;
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return strcmp(a->name, b->name);
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}
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void uniq(struct cmdnames *cmds)
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{
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unsigned int i, j;
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if (!cmds->cnt)
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return;
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for (i = j = 1; i < cmds->cnt; i++)
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if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
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cmds->names[j++] = cmds->names[i];
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cmds->cnt = j;
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}
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void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
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{
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size_t ci, cj, ei;
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int cmp;
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ci = cj = ei = 0;
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while (ci < cmds->cnt && ei < excludes->cnt) {
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cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
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if (cmp < 0)
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cmds->names[cj++] = cmds->names[ci++];
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else if (cmp == 0)
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ci++, ei++;
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else if (cmp > 0)
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ei++;
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}
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while (ci < cmds->cnt)
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cmds->names[cj++] = cmds->names[ci++];
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cmds->cnt = cj;
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}
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static void get_term_dimensions(struct winsize *ws)
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{
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char *s = getenv("LINES");
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if (s != NULL) {
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ws->ws_row = atoi(s);
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s = getenv("COLUMNS");
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if (s != NULL) {
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ws->ws_col = atoi(s);
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if (ws->ws_row && ws->ws_col)
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return;
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}
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}
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#ifdef TIOCGWINSZ
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if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
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ws->ws_row && ws->ws_col)
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return;
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#endif
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ws->ws_row = 25;
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ws->ws_col = 80;
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}
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static void pretty_print_string_list(struct cmdnames *cmds, int longest)
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{
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int cols = 1, rows;
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int space = longest + 1; /* min 1 SP between words */
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struct winsize win;
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int max_cols;
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int i, j;
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get_term_dimensions(&win);
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max_cols = win.ws_col - 1; /* don't print *on* the edge */
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if (space < max_cols)
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cols = max_cols / space;
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rows = (cmds->cnt + cols - 1) / cols;
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for (i = 0; i < rows; i++) {
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printf(" ");
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for (j = 0; j < cols; j++) {
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unsigned int n = j * rows + i;
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unsigned int size = space;
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if (n >= cmds->cnt)
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break;
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if (j == cols-1 || n + rows >= cmds->cnt)
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size = 1;
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printf("%-*s", size, cmds->names[n]->name);
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}
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putchar('\n');
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}
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}
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static int is_executable(const char *name)
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{
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struct stat st;
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if (stat(name, &st) || /* stat, not lstat */
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!S_ISREG(st.st_mode))
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return 0;
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return st.st_mode & S_IXUSR;
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}
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static int has_extension(const char *filename, const char *ext)
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{
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size_t len = strlen(filename);
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size_t extlen = strlen(ext);
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return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
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}
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static void list_commands_in_dir(struct cmdnames *cmds,
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const char *path,
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const char *prefix)
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{
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int prefix_len;
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DIR *dir = opendir(path);
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struct dirent *de;
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char *buf = NULL;
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if (!dir)
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return;
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if (!prefix)
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prefix = "perf-";
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prefix_len = strlen(prefix);
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astrcatf(&buf, "%s/", path);
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while ((de = readdir(dir)) != NULL) {
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int entlen;
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if (prefixcmp(de->d_name, prefix))
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continue;
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astrcat(&buf, de->d_name);
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if (!is_executable(buf))
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continue;
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entlen = strlen(de->d_name) - prefix_len;
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if (has_extension(de->d_name, ".exe"))
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entlen -= 4;
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add_cmdname(cmds, de->d_name + prefix_len, entlen);
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}
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closedir(dir);
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free(buf);
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}
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void load_command_list(const char *prefix,
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struct cmdnames *main_cmds,
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struct cmdnames *other_cmds)
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{
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const char *env_path = getenv("PATH");
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char *exec_path = get_argv_exec_path();
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if (exec_path) {
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list_commands_in_dir(main_cmds, exec_path, prefix);
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qsort(main_cmds->names, main_cmds->cnt,
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sizeof(*main_cmds->names), cmdname_compare);
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uniq(main_cmds);
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}
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if (env_path) {
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char *paths, *path, *colon;
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path = paths = strdup(env_path);
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while (1) {
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if ((colon = strchr(path, ':')))
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*colon = 0;
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if (!exec_path || strcmp(path, exec_path))
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list_commands_in_dir(other_cmds, path, prefix);
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if (!colon)
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break;
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path = colon + 1;
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}
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free(paths);
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qsort(other_cmds->names, other_cmds->cnt,
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sizeof(*other_cmds->names), cmdname_compare);
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uniq(other_cmds);
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}
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free(exec_path);
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exclude_cmds(other_cmds, main_cmds);
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}
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void list_commands(const char *title, struct cmdnames *main_cmds,
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struct cmdnames *other_cmds)
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{
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unsigned int i, longest = 0;
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for (i = 0; i < main_cmds->cnt; i++)
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if (longest < main_cmds->names[i]->len)
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longest = main_cmds->names[i]->len;
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for (i = 0; i < other_cmds->cnt; i++)
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if (longest < other_cmds->names[i]->len)
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longest = other_cmds->names[i]->len;
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if (main_cmds->cnt) {
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char *exec_path = get_argv_exec_path();
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printf("available %s in '%s'\n", title, exec_path);
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printf("----------------");
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mput_char('-', strlen(title) + strlen(exec_path));
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putchar('\n');
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pretty_print_string_list(main_cmds, longest);
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putchar('\n');
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free(exec_path);
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}
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if (other_cmds->cnt) {
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printf("%s available from elsewhere on your $PATH\n", title);
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printf("---------------------------------------");
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mput_char('-', strlen(title));
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putchar('\n');
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pretty_print_string_list(other_cmds, longest);
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putchar('\n');
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}
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}
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int is_in_cmdlist(struct cmdnames *c, const char *s)
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{
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unsigned int i;
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for (i = 0; i < c->cnt; i++)
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if (!strcmp(s, c->names[i]->name))
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return 1;
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return 0;
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}
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