// SPDX-License-Identifier: GPL-2.0
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#include "cache.h"
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#include "config.h"
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <subcmd/help.h>
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#include "../builtin.h"
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#include "levenshtein.h"
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#include <linux/zalloc.h>
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static int autocorrect;
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static int perf_unknown_cmd_config(const char *var, const char *value,
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void *cb __maybe_unused)
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{
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if (!strcmp(var, "help.autocorrect"))
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return perf_config_int(&autocorrect, var,value);
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return 0;
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}
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static int levenshtein_compare(const void *p1, const void *p2)
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{
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const struct cmdname *const *c1 = p1, *const *c2 = p2;
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const char *s1 = (*c1)->name, *s2 = (*c2)->name;
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int l1 = (*c1)->len;
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int l2 = (*c2)->len;
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return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
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}
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static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
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{
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unsigned int i, nr = cmds->cnt + old->cnt;
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void *tmp;
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if (nr > cmds->alloc) {
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/* Choose bigger one to alloc */
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if (alloc_nr(cmds->alloc) < nr)
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cmds->alloc = nr;
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else
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cmds->alloc = alloc_nr(cmds->alloc);
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tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
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if (!tmp)
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return -1;
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cmds->names = tmp;
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}
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for (i = 0; i < old->cnt; i++)
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cmds->names[cmds->cnt++] = old->names[i];
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zfree(&old->names);
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old->cnt = 0;
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return 0;
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}
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const char *help_unknown_cmd(const char *cmd)
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{
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unsigned int i, n = 0, best_similarity = 0;
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struct cmdnames main_cmds, other_cmds;
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memset(&main_cmds, 0, sizeof(main_cmds));
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memset(&other_cmds, 0, sizeof(main_cmds));
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perf_config(perf_unknown_cmd_config, NULL);
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load_command_list("perf-", &main_cmds, &other_cmds);
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if (add_cmd_list(&main_cmds, &other_cmds) < 0) {
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fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
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goto end;
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}
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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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if (main_cmds.cnt) {
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/* This reuses cmdname->len for similarity index */
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for (i = 0; i < main_cmds.cnt; ++i)
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main_cmds.names[i]->len =
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levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
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qsort(main_cmds.names, main_cmds.cnt,
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sizeof(*main_cmds.names), levenshtein_compare);
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best_similarity = main_cmds.names[0]->len;
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n = 1;
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while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
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++n;
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}
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if (autocorrect && n == 1) {
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const char *assumed = main_cmds.names[0]->name;
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main_cmds.names[0] = NULL;
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clean_cmdnames(&main_cmds);
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fprintf(stderr, "WARNING: You called a perf program named '%s', "
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"which does not exist.\n"
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"Continuing under the assumption that you meant '%s'\n",
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cmd, assumed);
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if (autocorrect > 0) {
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fprintf(stderr, "in %0.1f seconds automatically...\n",
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(float)autocorrect/10.0);
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poll(NULL, 0, autocorrect * 100);
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}
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return assumed;
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}
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fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
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if (main_cmds.cnt && best_similarity < 6) {
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fprintf(stderr, "\nDid you mean %s?\n",
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n < 2 ? "this": "one of these");
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for (i = 0; i < n; i++)
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fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
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}
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end:
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exit(1);
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}
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