diff options
Diffstat (limited to 'src/shared/pretty-print.c')
| -rw-r--r-- | src/shared/pretty-print.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/src/shared/pretty-print.c b/src/shared/pretty-print.c new file mode 100644 index 0000000..de6274a --- /dev/null +++ b/src/shared/pretty-print.c @@ -0,0 +1,247 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <sys/utsname.h> +#include <errno.h> +#include <stdio.h> + +#include "alloc-util.h" +#include "conf-files.h" +#include "def.h" +#include "env-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "pager.h" +#include "path-util.h" +#include "pretty-print.h" +#include "string-util.h" +#include "strv.h" +#include "terminal-util.h" +#include "util.h" + +static bool urlify_enabled(void) { + static int cached_urlify_enabled = -1; + + /* Unfortunately 'less' doesn't support links like this yet ðŸ˜, hence let's disable this as long as there's a + * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe + * to assume that a link-enabled 'less' version has hit most installations. */ + + if (cached_urlify_enabled < 0) { + int val; + + val = getenv_bool("SYSTEMD_URLIFY"); + if (val >= 0) + cached_urlify_enabled = val; + else + cached_urlify_enabled = colors_enabled() && !pager_have(); + } + + return cached_urlify_enabled; +} + +int terminal_urlify(const char *url, const char *text, char **ret) { + char *n; + + assert(url); + + /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See + * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */ + + if (isempty(text)) + text = url; + + if (urlify_enabled()) + n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a"); + else + n = strdup(text); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; +} + +int file_url_from_path(const char *path, char **ret) { + _cleanup_free_ char *absolute = NULL; + struct utsname u; + char *url = NULL; + int r; + + if (uname(&u) < 0) + return -errno; + + if (!path_is_absolute(path)) { + r = path_make_absolute_cwd(path, &absolute); + if (r < 0) + return r; + + path = absolute; + } + + /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local + * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested + * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly + * careful with validating the strings either. */ + + url = strjoin("file://", u.nodename, path); + if (!url) + return -ENOMEM; + + *ret = url; + return 0; +} + +int terminal_urlify_path(const char *path, const char *text, char **ret) { + _cleanup_free_ char *url = NULL; + int r; + + assert(path); + + /* Much like terminal_urlify() above, but takes a file system path as input + * and turns it into a proper file:// URL first. */ + + if (isempty(path)) + return -EINVAL; + + if (isempty(text)) + text = path; + + if (!urlify_enabled()) { + char *n; + + n = strdup(text); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; + } + + r = file_url_from_path(path, &url); + if (r < 0) + return r; + + return terminal_urlify(url, text, ret); +} + +int terminal_urlify_man(const char *page, const char *section, char **ret) { + const char *url, *text; + + url = strjoina("man:", page, "(", section, ")"); + text = strjoina(page, "(", section, ") man page"); + + return terminal_urlify(url, text, ret); +} + +static int cat_file(const char *filename, bool newline) { + _cleanup_fclose_ FILE *f = NULL; + _cleanup_free_ char *urlified = NULL; + int r; + + f = fopen(filename, "re"); + if (!f) + return -errno; + + r = terminal_urlify_path(filename, NULL, &urlified); + if (r < 0) + return r; + + printf("%s%s# %s%s\n", + newline ? "\n" : "", + ansi_highlight_blue(), + urlified, + ansi_normal()); + fflush(stdout); + + for (;;) { + _cleanup_free_ char *line = NULL; + + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + return log_error_errno(r, "Failed to read \"%s\": %m", filename); + if (r == 0) + break; + + puts(line); + } + + return 0; +} + +int cat_files(const char *file, char **dropins, CatFlags flags) { + char **path; + int r; + + if (file) { + r = cat_file(file, false); + if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL)) + printf("%s# config file %s not found%s\n", + ansi_highlight_magenta(), + file, + ansi_normal()); + else if (r < 0) + return log_warning_errno(r, "Failed to cat %s: %m", file); + } + + STRV_FOREACH(path, dropins) { + r = cat_file(*path, file || path != dropins); + if (r < 0) + return log_warning_errno(r, "Failed to cat %s: %m", *path); + } + + return 0; +} + +void print_separator(void) { + + /* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting + * one line filled with spaces with ANSI underline set, followed by a second (empty) line. */ + + if (underline_enabled()) { + size_t i, c; + + c = columns(); + + flockfile(stdout); + fputs_unlocked(ANSI_UNDERLINE, stdout); + + for (i = 0; i < c; i++) + fputc_unlocked(' ', stdout); + + fputs_unlocked(ANSI_NORMAL "\n\n", stdout); + funlockfile(stdout); + } else + fputs("\n\n", stdout); +} + +int conf_files_cat(const char *root, const char *name) { + _cleanup_strv_free_ char **dirs = NULL, **files = NULL; + _cleanup_free_ char *path = NULL; + const char *dir; + char **t; + int r; + + NULSTR_FOREACH(dir, CONF_PATHS_NULSTR("")) { + assert(endswith(dir, "/")); + r = strv_extendf(&dirs, "%s%s.d", dir, name); + if (r < 0) + return log_error_errno(r, "Failed to build directory list: %m"); + } + + r = conf_files_list_strv(&files, ".conf", root, 0, (const char* const*) dirs); + if (r < 0) + return log_error_errno(r, "Failed to query file list: %m"); + + path = path_join(root, "/etc", name); + if (!path) + return log_oom(); + + if (DEBUG_LOGGING) { + log_debug("Looking for configuration in:"); + log_debug(" %s", path); + STRV_FOREACH(t, dirs) + log_debug(" %s/*.conf", *t); + } + + /* show */ + return cat_files(path, files, CAT_FLAGS_MAIN_FILE_OPTIONAL); +} |