git/git

#include "git-compat-util.h"
#include "config.h"
#include "strbuf.h"
#include "trace2.h"
#include "trace2/tr2_cfg.h"
#include "trace2/tr2_sysenv.h"
#include "wildmatch.h"

static struct strbuf **tr2_cfg_patterns;
static int tr2_cfg_count_patterns;
static int tr2_cfg_loaded;

static struct strbuf **tr2_cfg_env_vars;
static int tr2_cfg_env_vars_count;
static int tr2_cfg_env_vars_loaded;

/*
 * Parse a string containing a comma-delimited list of config keys
 * or wildcard patterns into a list of strbufs.
 */
static int tr2_cfg_load_patterns(void)
{
    struct strbuf **s;
    const char *envvar;

    if (tr2_cfg_loaded)
        return tr2_cfg_count_patterns;
    tr2_cfg_loaded = 1;

    envvar = tr2_sysenv_get(TR2_SYSENV_CFG_PARAM);
    if (!envvar || !*envvar)
        return tr2_cfg_count_patterns;

    tr2_cfg_patterns = strbuf_split_buf(envvar, strlen(envvar), ',', -1);
    for (s = tr2_cfg_patterns; *s; s++) {
        struct strbuf *buf = *s;

        if (buf->len && buf->buf[buf->len - 1] == ',')
            strbuf_setlen(buf, buf->len - 1);
        strbuf_trim_trailing_newline(*s);
        strbuf_trim(*s);
    }

    tr2_cfg_count_patterns = s - tr2_cfg_patterns;
    return tr2_cfg_count_patterns;
}

void tr2_cfg_free_patterns(void)
{
    if (tr2_cfg_patterns)
        strbuf_list_free(tr2_cfg_patterns);
    tr2_cfg_count_patterns = 0;
    tr2_cfg_loaded = 0;
}

/*
 * Parse a string containing a comma-delimited list of environment variable
 * names into a list of strbufs.
 */
static int tr2_load_env_vars(void)
{
    struct strbuf **s;
    const char *varlist;

    if (tr2_cfg_env_vars_loaded)
        return tr2_cfg_env_vars_count;
    tr2_cfg_env_vars_loaded = 1;

    varlist = tr2_sysenv_get(TR2_SYSENV_ENV_VARS);
    if (!varlist || !*varlist)
        return tr2_cfg_env_vars_count;

    tr2_cfg_env_vars = strbuf_split_buf(varlist, strlen(varlist), ',', -1);
    for (s = tr2_cfg_env_vars; *s; s++) {
        struct strbuf *buf = *s;

        if (buf->len && buf->buf[buf->len - 1] == ',')
            strbuf_setlen(buf, buf->len - 1);
        strbuf_trim_trailing_newline(*s);
        strbuf_trim(*s);
    }

    tr2_cfg_env_vars_count = s - tr2_cfg_env_vars;
    return tr2_cfg_env_vars_count;
}

void tr2_cfg_free_env_vars(void)
{
    if (tr2_cfg_env_vars)
        strbuf_list_free(tr2_cfg_env_vars);
    tr2_cfg_env_vars_count = 0;
    tr2_cfg_env_vars_loaded = 0;
}

struct tr2_cfg_data {
    const char *file;
    int line;
};

/*
 * See if the given config key matches any of our patterns of interest.
 */
static int tr2_cfg_cb(const char *key, const char *value,
              const struct config_context *ctx, void *d)
{
    struct strbuf **s;
    struct tr2_cfg_data *data = (struct tr2_cfg_data *)d;

    for (s = tr2_cfg_patterns; *s; s++) {
        struct strbuf *buf = *s;
        int wm = wildmatch(buf->buf, key, WM_CASEFOLD);
        if (wm == WM_MATCH) {
            trace2_def_param_fl(data->file, data->line, key, value,
                        ctx->kvi);
            return 0;
        }
    }

    return 0;
}

void tr2_cfg_list_config_fl(const char *file, int line)
{
    struct tr2_cfg_data data = { file, line };

    if (tr2_cfg_load_patterns() > 0)
        read_early_config(tr2_cfg_cb, &data);
}

void tr2_list_env_vars_fl(const char *file, int line)
{
    struct key_value_info kvi = KVI_INIT;
    struct strbuf **s;

    kvi_from_param(&kvi);
    if (tr2_load_env_vars() <= 0)
        return;

    for (s = tr2_cfg_env_vars; *s; s++) {
        struct strbuf *buf = *s;
        const char *val = getenv(buf->buf);
        if (val && *val)
            trace2_def_param_fl(file, line, buf->buf, val, &kvi);
    }
}

void tr2_cfg_set_fl(const char *file, int line, const char *key,
            const char *value)
{
    struct key_value_info kvi = KVI_INIT;
    struct config_context ctx = {
        .kvi = &kvi,
    };
    struct tr2_cfg_data data = { file, line };

    if (tr2_cfg_load_patterns() > 0)
        tr2_cfg_cb(key, value, &ctx, &data);
}