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7aea01eaf4
The levenshtein penalty for deleting a character was far higher than
subsituting or inserting a character. Lower the penalty to match that
of inserting a character.
Before:
$ perf recccord
perf: 'recccord' is not a perf-command. See 'perf --help'.
$
After:
$ perf recccord
perf: 'recccord' is not a perf-command. See 'perf --help'.
Did you mean this?
record
$
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240301201306.2680986-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
// 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, struct cmdnames *main_cmds)
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{
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unsigned int i, n = 0, best_similarity = 0;
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struct cmdnames other_cmds;
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memset(&other_cmds, 0, sizeof(other_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,
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/*swap_penalty=*/0,
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/*substition_penality=*/2,
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/*insertion_penality=*/1,
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/*deletion_penalty=*/1);
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}
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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(&other_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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clean_cmdnames(&other_cmds);
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return NULL;
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}
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