Improve Python and Linenoise

This change reinvents all the GNU Readline features I discovered that I
couldn't live without, e.g. UTF-8, CTRL-R search and CTRL-Y yanking. It
now feels just as good in terms of user interface from the subconscious
workflow perspective. It's real nice to finally have an embeddable line
reader that's actually good with a 30 kb footprint and a bsd-2 license.

This change adds a directory to the examples folder, explaining how the
new Python compiler may be used.  Some of the bugs with Python binaries
have been addressed but overall it's still a work in progress.

third_party/linenoise/README.cosmo

@@ -1,7 +1,7 @@
 DESCRIPTION
 
-  linenoise is a library for interactive pseudoteletypewriter command
-  sessions using ANSI Standard X3.64 control sequences.
+  Cosmopolitan Linenoise is a library for interactive pseudoteletypewriter
+  command sessions using ANSI Standard X3.64 control sequences.
 
 ORIGIN
 
@@ -10,3 +10,11 @@ ORIGIN
   Author: antirez <antirez@gmail.com>
   Date:   Thu Mar 12 15:51:45 2020 +0100
   Use unsigned int instead of uint like rest of code base.
+
+DOCUMENTATION
+
+  See linenoise.c
+
+LOCAL CHANGES
+
+  See linenoise.c

third_party/linenoise/ezlinenoise.c

@@ -1,37 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/runtime/gc.internal.h"
-#include "libc/x/x.h"
-#include "third_party/linenoise/linenoise.h"
-
-/**
- * Reads line of input from terminal w/ history file.
- */
-char *ezlinenoise(const char *prompt, const char *prog) {
-  char *p, *h;
-  h = gc(xasprintf("%s/.%s_history", gc(xhomedir()), prog));
-  linenoiseHistoryLoad(h);
-  p = linenoise(prompt);
-  if (p && *p) {
-    linenoiseHistoryLoad(h);
-    linenoiseHistoryAdd(p);
-    linenoiseHistorySave(h);
-  }
-  return p;
-}

third_party/linenoise/linenoise.h

@@ -19,18 +19,17 @@ void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *);
 void linenoiseAddCompletion(linenoiseCompletions *, const char *);
 
 char *linenoise(const char *) nodiscard;
+char *linenoiseRaw(const char *, int, int) nodiscard;
 char *ezlinenoise(const char *, const char *) nodiscard;
 int linenoiseHistoryAdd(const char *);
-int linenoiseHistorySetMaxLen(int);
 int linenoiseHistorySave(const char *);
 int linenoiseHistoryLoad(const char *);
 void linenoiseFreeCompletions(linenoiseCompletions *);
 void linenoiseHistoryFree(void);
-void linenoiseClearScreen(void);
-void linenoiseSetMultiLine(int);
+void linenoiseClearScreen(int);
 void linenoiseMaskModeEnable(void);
 void linenoiseMaskModeDisable(void);
-void linenoiseDisableRawMode(int);
+void linenoiseDisableRawMode(void);
 void linenoiseFree(void *);
 
 COSMOPOLITAN_C_END_

third_party/linenoise/linenoise.mk

@@ -25,7 +25,6 @@ THIRD_PARTY_LINENOISE_A_DIRECTDEPS =				\
 	LIBC_STDIO						\
 	LIBC_RUNTIME						\
 	LIBC_SYSV_CALLS						\
-	LIBC_X							\
 	LIBC_STR						\
 	LIBC_UNICODE						\
 	LIBC_STUBS
@@ -44,6 +43,7 @@ $(THIRD_PARTY_LINENOISE_A).pkg:					\
 
 $(THIRD_PARTY_LINENOISE_A_OBJS):				\
 		OVERRIDE_CFLAGS +=				\
+			-fno-jump-tables			\
 			-ffunction-sections			\
 			-fdata-sections