rename get_is_interactive and remove stupid test

I'm doing this as part of fixing issue #2980. The code for managing tty modes
and job control is a horrible mess. This is a very tiny step towards improving
the situation.

src/builtin.cpp

@@ -181,7 +181,7 @@ void builtin_print_help(parser_t &parser, io_streams_t &streams, const wchar_t *
 
             screen_height = common_get_height();
             lines = count_char(str, L'\n');
-            if (!get_is_interactive() || (lines > 2 * screen_height / 3)) {
+            if (!shell_is_interactive() || (lines > 2 * screen_height / 3)) {
                 wchar_t *pos;
                 int cut = 0;
                 int i;
@@ -2368,7 +2368,7 @@ static int builtin_cd(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
                                       argv[0], dir_in.c_str());
         }
 
-        if (!get_is_interactive()) {
+        if (!shell_is_interactive()) {
             streams.err.append(parser.current_line());
         }
 
@@ -2385,7 +2385,7 @@ static int builtin_cd(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
             streams.err.append_format(_(L"%ls: '%ls' is not a directory\n"), argv[0], dir.c_str());
         }
 
-        if (!get_is_interactive()) {
+        if (!shell_is_interactive()) {
             streams.err.append(parser.current_line());
         }
 

src/parse_execution.cpp

@@ -1183,7 +1183,7 @@ parse_execution_result_t parse_execution_context_t::run_1_job(const parse_node_t
 
     // Get terminal modes.
     struct termios tmodes = {};
-    if (get_is_interactive()) {
+    if (shell_is_interactive()) {
         if (tcgetattr(STDIN_FILENO, &tmodes)) {
             // Need real error handling here.
             wperror(L"tcgetattr");
@@ -1254,14 +1254,14 @@ parse_execution_result_t parse_execution_context_t::run_1_job(const parse_node_t
     j->tmodes = tmodes;
     job_set_flag(j, JOB_CONTROL,
                  (job_control_mode == JOB_CONTROL_ALL) ||
-                     ((job_control_mode == JOB_CONTROL_INTERACTIVE) && (get_is_interactive())));
+                     ((job_control_mode == JOB_CONTROL_INTERACTIVE) && (shell_is_interactive())));
 
     job_set_flag(j, JOB_FOREGROUND, !tree.job_should_be_backgrounded(job_node));
 
     job_set_flag(j, JOB_TERMINAL, job_get_flag(j, JOB_CONTROL) && !is_subshell && !is_event);
 
     job_set_flag(j, JOB_SKIP_NOTIFICATION,
-                 is_subshell || is_block || is_event || !get_is_interactive());
+                 is_subshell || is_block || is_event || !shell_is_interactive());
 
     // Tell the current block what its job is. This has to happen before we populate it (#1394).
     parser->current_block()->job = j;

src/parse_tree.cpp

@@ -139,7 +139,7 @@ wcstring parse_error_t::describe_with_prefix(const wcstring &src, const wcstring
 }
 
 wcstring parse_error_t::describe(const wcstring &src) const {
-    return this->describe_with_prefix(src, wcstring(), get_is_interactive(), false);
+    return this->describe_with_prefix(src, wcstring(), shell_is_interactive(), false);
 }
 
 void parse_error_offset_source_start(parse_error_list_t *errors, size_t amt) {

src/parser.cpp

@@ -522,7 +522,7 @@ wcstring parser_t::current_line() {
     wcstring prefix;
 
     // If we are not going to print a stack trace, at least print the line number and filename.
-    if (!get_is_interactive() || is_function()) {
+    if (!shell_is_interactive() || is_function()) {
         if (file) {
             append_format(prefix, _(L"%ls (line %d): "), user_presentable_path(file).c_str(),
                           lineno);
@@ -533,7 +533,7 @@ wcstring parser_t::current_line() {
         }
     }
 
-    bool is_interactive = get_is_interactive();
+    bool is_interactive = shell_is_interactive();
     bool skip_caret = is_interactive && !is_function();
 
     // Use an error with empty text.
@@ -756,7 +756,7 @@ void parser_t::get_backtrace(const wcstring &src, const parse_error_list_t &erro
     if (!errors.empty()) {
         const parse_error_t &err = errors.at(0);
 
-        const bool is_interactive = get_is_interactive();
+        const bool is_interactive = shell_is_interactive();
 
         // Determine if we want to try to print a caret to point at the source error. The
         // err.source_start <= src.size() check is due to the nasty way that slices work, which is

src/proc.cpp

@@ -101,10 +101,11 @@ static int is_interactive = -1;
 
 static bool proc_had_barrier = false;
 
-int get_is_interactive(void) {
+bool shell_is_interactive(void) {
     ASSERT_IS_MAIN_THREAD();
-    // is_interactive is initialized to -1; ensure someone has popped/pushed it before then.
+    // is_interactive is statically initialized to -1. Ensure it has been dynamically set
-    assert(is_interactive >= 0);
+    // before we're called.
+    assert(is_interactive != -1);
     return is_interactive > 0;
 }
 

src/proc.h

@@ -232,7 +232,7 @@ extern int is_subshell;
 extern int is_block;
 
 /// Whether we are reading from the keyboard right now.
-int get_is_interactive(void);
+bool shell_is_interactive(void);
 
 /// Whether this shell is attached to the keyboard at all.
 extern int is_interactive_session;

src/reader.cpp

@@ -1686,7 +1686,7 @@ static void reader_interactive_destroy() {
 
 void reader_sanity_check() {
     // Note: 'data' is non-null if we are interactive, except in the testing environment.
-    if (get_is_interactive() && data != NULL) {
+    if (shell_is_interactive() && data != NULL) {
         if (data->command_line.position > data->command_line.size()) sanity_lose();
         if (data->colors.size() != data->command_line.size()) sanity_lose();
         if (data->indents.size() != data->command_line.size()) sanity_lose();
@@ -2217,7 +2217,7 @@ static void reader_super_highlight_me_plenty(int match_highlight_pos_adjust, boo
 }
 
 bool shell_is_exiting() {
-    if (get_is_interactive())
+    if (shell_is_interactive())
         return job_list_is_empty() && data != NULL && data->end_loop;
     else
         return end_loop;
@@ -3412,7 +3412,7 @@ int reader_read(int fd, const io_chain_t &io) {
     int inter = ((fd == STDIN_FILENO) && isatty(STDIN_FILENO));
     proc_push_interactive(inter);
 
-    res = get_is_interactive() ? read_i() : read_ni(fd, io);
+    res = shell_is_interactive() ? read_i() : read_ni(fd, io);
 
     // If the exit command was called in a script, only exit the script, not the program.
     if (data) data->end_loop = 0;

src/sanity.cpp

@@ -18,8 +18,7 @@ void sanity_lose() {
 }
 
 int sanity_check() {
-    if (!insane)
+    if (!insane && shell_is_interactive()) history_sanity_check();
-        if (get_is_interactive()) history_sanity_check();
     if (!insane) reader_sanity_check();
     if (!insane) kill_sanity_check();
     if (!insane) proc_sanity_check();

src/signal.cpp

@@ -249,8 +249,6 @@ void signal_reset_handlers() {
 void signal_set_handlers() {
     struct sigaction act;
 
-    if (get_is_interactive() == -1) return;
-
     sigemptyset(&act.sa_mask);
     act.sa_flags = SA_SIGINFO;
     act.sa_sigaction = &default_handler;
@@ -267,9 +265,9 @@ void signal_set_handlers() {
     // Ignore sigpipe, which we may get from the universal variable notifier.
     sigaction(SIGPIPE, &act, 0);
 
-    if (get_is_interactive()) {
+    if (shell_is_interactive()) {
-        // Interactive mode. Ignore interactive signals.  We are a shell, we know whats best for the
+        // Interactive mode. Ignore interactive signals.  We are a shell, we know what is best for
-        // user.
+        // the user.
         act.sa_handler = SIG_IGN;
 
         sigaction(SIGINT, &act, 0);