Make curl example into a complete tool (#706)

You can now handily use `curl` with popen()/system() by
placing `STATIC_YOINK("_curl")` in your main source file.

Makefile

@@ -193,6 +193,7 @@ include third_party/python/python.mk
 include tool/build/emucrt/emucrt.mk
 include tool/build/emubin/emubin.mk
 include tool/build/build.mk
+include tool/curl/curl.mk
 include examples/examples.mk
 include examples/pyapp/pyapp.mk
 include examples/pylife/pylife.mk

libc/runtime/cocmd.c

@@ -38,6 +38,7 @@
 #include "third_party/awk/cmd.h"
 #include "third_party/sed/cmd.h"
 #include "third_party/tr/cmd.h"
+#include "tool/curl/cmd.h"
 
 /**
  * @fileoverview Cosmopolitan Command Interpreter
@@ -417,6 +418,7 @@ static int TryBuiltin(void) {
   if (_weaken(_tr) && !strcmp(args[0], "tr")) return Fake(_weaken(_tr));
   if (_weaken(_sed) && !strcmp(args[0], "sed")) return Fake(_weaken(_sed));
   if (_weaken(_awk) && !strcmp(args[0], "awk")) return Fake(_weaken(_awk));
+  if (_weaken(_curl) && !strcmp(args[0], "curl")) return Fake(_weaken(_curl));
   return -1;
 }
 

tool/curl/cmd.c

@@ -0,0 +1,5 @@
+#include "tool/curl/cmd.h"
+
+int main(int argc, char *argv[]) {
+  return _curl(argc, argv);
+}

tool/curl/cmd.h

@@ -0,0 +1,10 @@
+#ifndef COSMOPOLITAN_TOOL_CURL_CMD_H_
+#define COSMOPOLITAN_TOOL_CURL_CMD_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+int _curl(int, char *[]);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_TOOL_CURL_CMD_H_ */

tool/curl/curl.c

@@ -52,12 +52,10 @@
 #include "third_party/mbedtls/pk.h"
 #include "third_party/mbedtls/ssl.h"
 #include "third_party/mbedtls/ssl_ticket.h"
+#include "tool/curl/cmd.h"
 
 /**
  * @fileoverview Downloads HTTP URL to stdout.
- *
- *     make -j8 o//examples/curl.com
- *     o//examples/curl.com http://justine.lol/ape.html
  */
 
 #define HasHeader(H)    (!!msg.headers[H].a)
@@ -121,7 +119,7 @@ static wontreturn void PrintUsage(FILE *f, int rc) {
   exit(rc);
 }
 
-int main(int argc, char *argv[]) {
+int _curl(int argc, char *argv[]) {
   if (!NoDebug()) ShowCrashReports();
 
   /*

tool/curl/curl.mk

@@ -0,0 +1,74 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += TOOL_CURL
+
+TOOL_CURL_ARTIFACTS += TOOL_CURL_A
+TOOL_CURL = $(TOOL_CURL_DEPS) $(TOOL_CURL_A)
+TOOL_CURL_A = o/$(MODE)/tool/curl/curl.a
+TOOL_CURL_FILES := $(wildcard tool/curl/*)
+TOOL_CURL_HDRS = $(filter %.h,$(TOOL_CURL_FILES))
+TOOL_CURL_INCS = $(filter %.inc,$(TOOL_CURL_FILES))
+TOOL_CURL_SRCS = $(filter %.c,$(TOOL_CURL_FILES))
+TOOL_CURL_OBJS = $(TOOL_CURL_SRCS:%.c=o/$(MODE)/%.o)
+
+TOOL_CURL_DIRECTDEPS =				\
+	LIBC_CALLS				\
+	LIBC_DNS				\
+	LIBC_FMT				\
+	LIBC_INTRIN				\
+	LIBC_LOG				\
+	LIBC_MEM				\
+	LIBC_NEXGEN32E				\
+	LIBC_NT_IPHLPAPI			\
+	LIBC_NT_KERNEL32			\
+	LIBC_RUNTIME				\
+	LIBC_SOCK				\
+	LIBC_STDIO				\
+	LIBC_STR				\
+	LIBC_STUBS				\
+	LIBC_SYSV				\
+	LIBC_SYSV_CALLS				\
+	LIBC_TIME				\
+	LIBC_THREAD				\
+	LIBC_TINYMATH				\
+	LIBC_X					\
+	LIBC_ZIPOS				\
+	NET_HTTP				\
+	NET_HTTPS				\
+	THIRD_PARTY_GETOPT			\
+	THIRD_PARTY_MBEDTLS
+
+TOOL_CURL_DEPS :=				\
+	$(call uniq,$(foreach x,$(TOOL_CURL_DIRECTDEPS),$($(x))))
+
+TOOL_CURL_CHECKS =				\
+	$(TOOL_CURL_A).pkg			\
+	$(TOOL_CURL_HDRS:%=o/$(MODE)/%.ok)
+
+$(TOOL_CURL_A):					\
+		tool/curl/			\
+		$(TOOL_CURL_A).pkg		\
+		$(TOOL_CURL_OBJS)
+
+$(TOOL_CURL_A).pkg:				\
+		$(TOOL_CURL_OBJS)		\
+		$(foreach x,$(TOOL_CURL_DIRECTDEPS),$($(x)_A).pkg)
+
+o/$(MODE)/tool/curl/curl.com.dbg:		\
+		$(TOOL_CURL)			\
+		o/$(MODE)/tool/curl/cmd.o	\
+		o/$(MODE)/tool/curl/curl.o	\
+		$(CRT)				\
+		$(APE_NO_MODIFY_SELF)
+	@$(APELINK)
+
+TOOL_CURL_LIBS = $(TOOL_CURL_A)
+TOOL_CURL_BINS = $(TOOL_CURL_COMS) $(TOOL_CURL_COMS:%=%.dbg)
+TOOL_CURL_COMS = o/$(MODE)/tool/curl/curl.com
+$(TOOL_CURL_OBJS): $(BUILD_FILES) tool/curl/curl.mk
+
+.PHONY: o/$(MODE)/tool/curl
+o/$(MODE)/tool/curl:				\
+		$(TOOL_CURL_BINS)		\
+		$(TOOL_CURL_CHECKS)

tool/net/net.mk

@@ -15,6 +15,7 @@ TOOL_NET_BINS =									\
 	$(TOOL_NET_COMS:%=%.dbg)
 
 TOOL_NET_COMS =									\
+	o/$(MODE)/tool/net/curl.com						\
 	o/$(MODE)/tool/net/dig.com						\
 	o/$(MODE)/tool/net/redbean.com						\
 	o/$(MODE)/tool/net/redbean-demo.com					\

tool/tool.mk

@@ -5,6 +5,7 @@
 o/$(MODE)/tool:			\
 	o/$(MODE)/tool/args	\
 	o/$(MODE)/tool/build	\
+	o/$(MODE)/tool/curl	\
 	o/$(MODE)/tool/decode	\
 	o/$(MODE)/tool/hash	\
 	o/$(MODE)/tool/lambda	\