+static const char *get_man_viewer_info(const char *name)
+{
+ struct man_viewer_info_list *viewer;
+
+ for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
+ {
+ if (!strcasecmp(name, viewer->name))
+ return viewer->info;
+ }
+ return NULL;
+}
+
+static int check_emacsclient_version(void)
+{
+ struct strbuf buffer = STRBUF_INIT;
+ struct child_process ec_process;
+ const char *argv_ec[] = { "emacsclient", "--version", NULL };
+ int version;
+
+ /* emacsclient prints its version number on stderr */
+ memset(&ec_process, 0, sizeof(ec_process));
+ ec_process.argv = argv_ec;
+ ec_process.err = -1;
+ ec_process.stdout_to_stderr = 1;
+ if (start_command(&ec_process)) {
+ fprintf(stderr, "Failed to start emacsclient.\n");
+ return -1;
+ }
+ strbuf_read(&buffer, ec_process.err, 20);
+ close(ec_process.err);
+
+ /*
+ * Don't bother checking return value, because "emacsclient --version"
+ * seems to always exits with code 1.
+ */
+ finish_command(&ec_process);
+
+ if (prefixcmp(buffer.buf, "emacsclient")) {
+ fprintf(stderr, "Failed to parse emacsclient version.\n");
+ strbuf_release(&buffer);
+ return -1;
+ }
+
+ strbuf_remove(&buffer, 0, strlen("emacsclient"));
+ version = atoi(buffer.buf);
+
+ if (version < 22) {
+ fprintf(stderr,
+ "emacsclient version '%d' too old (< 22).\n",
+ version);
+ strbuf_release(&buffer);
+ return -1;
+ }
+
+ strbuf_release(&buffer);
+ return 0;
+}
+
+static void exec_woman_emacs(const char* path, const char *page)
+{
+ if (!check_emacsclient_version()) {
+ /* This works only with emacsclient version >= 22. */
+ struct strbuf man_page = STRBUF_INIT;
+
+ if (!path)
+ path = "emacsclient";
+ strbuf_addf(&man_page, "(woman \"%s\")", page);
+ execlp(path, "emacsclient", "-e", man_page.buf, NULL);
+ warning("failed to exec '%s': %s", path, strerror(errno));
+ }
+}
+
+static void exec_man_konqueror(const char* path, const char *page)
+{
+ const char *display = getenv("DISPLAY");
+ if (display && *display) {
+ struct strbuf man_page = STRBUF_INIT;
+ const char *filename = "kfmclient";
+
+ /* It's simpler to launch konqueror using kfmclient. */
+ if (path) {
+ const char *file = strrchr(path, '/');
+ if (file && !strcmp(file + 1, "konqueror")) {
+ char *new = xstrdup(path);
+ char *dest = strrchr(new, '/');
+
+ /* strlen("konqueror") == strlen("kfmclient") */
+ strcpy(dest + 1, "kfmclient");
+ path = new;
+ }
+ if (file)
+ filename = file;
+ } else
+ path = "kfmclient";
+ strbuf_addf(&man_page, "man:%s(1)", page);
+ execlp(path, filename, "newTab", man_page.buf, NULL);
+ warning("failed to exec '%s': %s", path, strerror(errno));
+ }
+}
+
+static void exec_man_man(const char* path, const char *page)
+{
+ if (!path)
+ path = "man";
+ execlp(path, "man", page, NULL);
+ warning("failed to exec '%s': %s", path, strerror(errno));
+}
+
+static void exec_man_cmd(const char *cmd, const char *page)
+{
+ struct strbuf shell_cmd = STRBUF_INIT;
+ strbuf_addf(&shell_cmd, "%s %s", cmd, page);
+ execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL);
+ warning("failed to exec '%s': %s", cmd, strerror(errno));
+}
+
+static void add_man_viewer(const char *name)
+{
+ struct man_viewer_list **p = &man_viewer_list;
+ size_t len = strlen(name);
+
+ while (*p)
+ p = &((*p)->next);
+ *p = xcalloc(1, (sizeof(**p) + len + 1));
+ strncpy((*p)->name, name, len);
+}
+
+static int supported_man_viewer(const char *name, size_t len)
+{
+ return (!strncasecmp("man", name, len) ||
+ !strncasecmp("woman", name, len) ||
+ !strncasecmp("konqueror", name, len));
+}
+
+static void do_add_man_viewer_info(const char *name,
+ size_t len,
+ const char *value)
+{
+ struct man_viewer_info_list *new = xcalloc(1, sizeof(*new) + len + 1);
+
+ strncpy(new->name, name, len);
+ new->info = xstrdup(value);
+ new->next = man_viewer_info_list;
+ man_viewer_info_list = new;
+}
+
+static int add_man_viewer_path(const char *name,
+ size_t len,
+ const char *value)
+{
+ if (supported_man_viewer(name, len))
+ do_add_man_viewer_info(name, len, value);
+ else
+ warning("'%s': path for unsupported man viewer.\n"
+ "Please consider using 'man.<tool>.cmd' instead.",
+ name);
+
+ return 0;
+}
+
+static int add_man_viewer_cmd(const char *name,
+ size_t len,
+ const char *value)
+{
+ if (supported_man_viewer(name, len))
+ warning("'%s': cmd for supported man viewer.\n"
+ "Please consider using 'man.<tool>.path' instead.",
+ name);
+ else
+ do_add_man_viewer_info(name, len, value);
+
+ return 0;
+}
+
+static int add_man_viewer_info(const char *var, const char *value)
+{
+ const char *name = var + 4;
+ const char *subkey = strrchr(name, '.');
+
+ if (!subkey)
+ return error("Config with no key for man viewer: %s", name);
+
+ if (!strcmp(subkey, ".path")) {
+ if (!value)
+ return config_error_nonbool(var);
+ return add_man_viewer_path(name, subkey - name, value);
+ }
+ if (!strcmp(subkey, ".cmd")) {
+ if (!value)
+ return config_error_nonbool(var);
+ return add_man_viewer_cmd(name, subkey - name, value);
+ }
+
+ warning("'%s': unsupported man viewer sub key.", subkey);
+ return 0;
+}
+