chsrc/chsrc.c

/* --------------------------------------------------------------
* File          : chsrc.c
* Authors       : Aoran Zeng <ccmywish@qq.com>
* Created on    : <2023-08-28>
* Last modified : <2023-09-01>
*
* chsrc:
*
*   Change Source —— 命令行换源工具
* -------------------------------------------------------------*/

#include "chsrc.h"

#define Chsrc_Version "v0.1.0.20230910.pre"


/**
 * 检测二进制程序是否存在
 *
 * @param[in]  check_cmd  检测 `progname` 是否存在的一段命令，一般来说，填 `progname` 本身即可，
 *                        但是某些情况下，需要使用其他命令绕过一些特殊情况，比如 python 这个命令在Windows上
 *                        会自动打开 Microsoft Store，需避免
 *
 * @param[in]  progname   要检测的二进制程序名
 */
bool
does_the_program_exist (char* check_cmd, char* progname)
{
  char* which = check_cmd;

  int ret = system(which);

  char buf[32] = {0};
  sprintf(buf, "错误码: %d", ret);

  if (0!=ret) {
    xy_warn (xy_strjoin(4, "× 命令 ", progname, " 不存在，", buf));
    return false;
  } else {
    xy_success (xy_strjoin(3, "√ 命令 ", progname, " 存在"));
    return true;
  }
}



/**
 * 测速代码参考自 https://github.com/mirrorz-org/oh-my-mirrorz/blob/master/oh-my-mirrorz.py
 * 修改为C语言，一切功劳属于原作者
 *
 * @return 返回测得的速度，若无速度或出错，返回0
 */
double
test_speed (char* url)
{
  char* curl_cmd, *devnull = NULL;
  if (xy_on_windows)
    devnull = "nul";
  else
    devnull = "/dev/null";

  curl_cmd = xy_strjoin(4, "curl -qs -o ", devnull, "-w '%{http_code} %{speed_download}' -m8 -A chsrc/" Chsrc_Version
             "(+https://gitee.com/RubyMetric/chsrc)", url);

  FILE* fp = popen(curl_cmd, "r");
  char buf[64] = {0};
  fgets(buf, 64, fp);
  fclose(fp);
  char* split = strchr(buf, ' ');
  *split = '\0';
  int http_code = atoi(buf);
  double speed  = atof(split+1);

  char* speedstr = to_human_readable_speed(speed);

  puts(url);

  if (200!=http_code) {
    xy_warn (xy_2strjoin("HTTP码 = ", buf));
  }
  puts(xy_2strjoin("速度 = ", speedstr));
}


char*
to_human_readable_speed (double speed)
{
  char* scale[] = {"Byte/s", "KByte/s", "MByte/s", "GByte/s", "TByte/s"};
  int i = 0;
  while (speed > 1024.0)
  {
    i += 1;
    speed /= 1024.0;
  }
  char* buf = xy_malloc0(64);
  sprintf(buf, "%.2f %s", speed, scale[i]);
}



/**
 * Perl换源
 *
 * 参考：https://help.mirrors.cernet.edu.cn/CPAN/
 */
void
pl_perl_setsrc (char* option)
{
  int selected = 0; char* check_cmd, *prog = NULL;

  if (xy_on_windows) check_cmd = "perl --version >nul 2>nul";
  else               check_cmd = "perl --version 1>/dev/null 2>&1";

  bool exist_b = does_the_program_exist (check_cmd, "perl");

  if (!exist_b) {
    xy_error ("chsrc: 未找到 perl 相关命令，请检查是否存在");
    return;
  }

  for (int i=0;i<sizeof(pl_perl_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_perl_sources[selected].mirror->name;
  const char* source_abbr = pl_perl_sources[selected].mirror->abbr;
  const char* source_url  = pl_perl_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  char* cmd = xy_strjoin(3,
  "perl -MCPAN -e 'CPAN::HandleConfig->edit(\"pushy_https\", 0); CPAN::HandleConfig->edit(\"urllist\", \"unshift\", \"",
   source_url,
  "\"); mkmyconfig'");

  system(cmd);
  free(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}



/**
 * NodeJS换源
 *
 * 参考：https://npmmirror.com/
 */
void
pl_nodejs_setsrc (char* option)
{
  int selected = 0; char* check_cmd, *prog = NULL;

  if (xy_on_windows) check_cmd = "npm -v >nul 2>nul";
  else               check_cmd = "npm -v 1>/dev/null 2>&1";

  bool exist_b = does_the_program_exist (check_cmd, "npm");

  if (!exist_b) {
    xy_error ("chsrc: 未找到 npm 相关命令，请检查是否存在");
    return;
  }

  for (int i=0;i<sizeof(pl_nodejs_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_nodejs_sources[selected].mirror->name;
  const char* source_abbr = pl_nodejs_sources[selected].mirror->abbr;
  const char* source_url  = pl_nodejs_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  char* cmd = xy_2strjoin("npm config set registry  ", source_url);
  system(cmd);
  free(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}


/**
 * Python换源
 *
 * 参考：https://mirrors.tuna.tsinghua.edu.cn/help/pypi/
 *
 * 经测试，Windows上调用换源命令，会写入 C:\Users\RubyMetric\AppData\Roaming\pip\pip.ini
 */
void
pl_python_setsrc (char* option)
{
  int selected = 0; char* check_cmd, *prog = NULL;

  // 不要调用 python 自己，而是使用 python --version，避免Windows弹出Microsoft Store
  if (xy_on_windows) check_cmd = "python --version >nul 2>nul";
  else               check_cmd = "python --version 1>/dev/null 2>&1";

  bool exist_b = does_the_program_exist (check_cmd, "python");

  if (!exist_b) {
    if (xy_on_windows) check_cmd = "python3 --version >nul 2>nul";
    else               check_cmd = "python3 --version 1>/dev/null 2>&1";
    exist_b = does_the_program_exist (check_cmd, "python3");
    if (exist_b) prog = "python3";
  }
  else {
    prog = "python";
  }

  if (!exist_b) {
    xy_error ("chsrc: 未找到 Python 相关命令，请检查是否存在");
    return;
  }

  for (int i=0;i<sizeof(pl_python_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_python_sources[selected].mirror->name;
  const char* source_abbr = pl_python_sources[selected].mirror->abbr;
  const char* source_url  = pl_python_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  char* cmd = xy_2strjoin(prog, xy_2strjoin(" -m pip config set global.index-url ", source_url));
  system(cmd);
  free(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}


/**
 * Ruby换源
 *
 * 参考：https://gitee.com/RubyKids/rbenv-cn
 */
void
pl_ruby_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;
  for (int i=0;i<sizeof(pl_ruby_sources);i++) {
    // 循环测速
  }

  if (xy_on_windows) check_cmd = "gem -v >nul 2>nul";
  else               check_cmd = "gem -v 1>/dev/null 2>&1";
  bool exist_b = does_the_program_exist (check_cmd, "gem");
  if (!exist_b) {
    xy_error ("chsrc: 未找到 gem 相关命令，请检查是否存在");
    return;
  }

  const char* source_name = pl_ruby_sources[selected].mirror->name;
  const char* source_abbr = pl_ruby_sources[selected].mirror->abbr;
  const char* source_url  = pl_ruby_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  xy_info("chsrc: 为 gem 命令换源");
  system("gem source -r https://rubygems.org/");

  char* cmd = xy_2strjoin("gem source -a ", source_url);
  system(cmd);
  free(cmd);


  if (xy_on_windows) check_cmd = "bundle -v >nul 2>nul";
  else               check_cmd = "bundle -v 1>/dev/null 2>&1";
  exist_b = does_the_program_exist (check_cmd, "bundle");
  if (!exist_b) {
    xy_error ("chsrc: 未找到 bundle 相关命令，请检查是否存在");
    return;
  }

  cmd = xy_2strjoin("bundle config 'mirror.https://rubygems.org' ", source_url);
  xy_info("chsrc: 为 bundler 命令换源");
  system(cmd);
  free(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}

void
pl_ruby_getsrc (char* option)
{
  char* cmd = "gem sources";
  xy_info (xy_2strjoin("chsrc: 运行 ", cmd));
  system(cmd);
  cmd = "bundle config get mirror.https://rubygems.org";
  xy_info (xy_2strjoin("chsrc: 运行 ", cmd));
  system(cmd);
}

void
pl_ruby_listsrc (char* option)
{
  const mirror_info* mir = pl_ruby_sources->mirror;
  printf ("%-18s%-41s ", mir->abbr, pl_ruby_sources->url);
  puts(mir->name);
}


/**
 * Go换源
 *
 * 参考：https://goproxy.cn/
 */
void
pl_go_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  if (xy_on_windows) check_cmd = "go --version >nul 2>nul";
  else               check_cmd = "go --version 1>/dev/null 2>&1";

  bool exist_b = does_the_program_exist (check_cmd, "go");

  if (!exist_b) {
    xy_error ("chsrc: 未找到 go 相关命令，请检查是否存在");
    return;
  }

  for (int i=0;i<sizeof(pl_go_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_go_sources[selected].mirror->name;
  const char* source_abbr = pl_go_sources[selected].mirror->abbr;
  const char* source_url  = pl_go_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));
  char* cmd = "go env -w GO111MODULE=on";
  system(cmd);

  cmd = xy_strjoin(3, "go env -w GOPROXY=", source_url, ",direct");
  system(cmd);
  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}



/**
 * Rust 换源
 *
 * 参考：https://help.mirrors.cernet.edu.cn/crates.io-index.git
 */
void
pl_rust_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  for (int i=0;i<sizeof(pl_rust_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_rust_sources[selected].mirror->name;
  const char* source_abbr = pl_rust_sources[selected].mirror->abbr;
  const char* source_url  = pl_rust_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));


  const char* file = xy_strjoin (3,
    "[source.crates-io]\n"
    "replace-with = 'mirror'\n\n"

    "[source.mirror]\n"
    "registry = \"", source_url, "\"");


  char* cmd = NULL;
  if (xy_on_windows)
    cmd = xy_strjoin(3, "echo ", file, ">> \%USERPROFILE%\\.cargo");
  else
    cmd = xy_strjoin(3, "echo ", file, ">> $HOME/.cargo");

  system(cmd);
  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}




/**
 * NuGet 换源
 *
 */
void
pl_dotnet_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  xy_error ("chsrc: 暂时无法为NuGet换源，若有需求，请您提交issue");
}




/**
 * PHP 换源
 *
 * 参考：https://developer.aliyun.com/composer
 */
void
pl_php_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  if (xy_on_windows) check_cmd = "composer --version >nul 2>nul";
  else               check_cmd = "composer --version 1>/dev/null 2>&1";

  bool exist_b = does_the_program_exist (check_cmd, "composer");

  if (!exist_b) {
    xy_error ("chsrc: 未找到 composer 相关命令，请检查是否存在");
    return;
  }

  for (int i=0;i<sizeof(pl_php_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_php_sources[selected].mirror->name;
  const char* source_abbr = pl_php_sources[selected].mirror->abbr;
  const char* source_url  = pl_php_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  char* cmd = xy_2strjoin("composer config repo.packagist composer ", source_url);
  system(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}



/**
 * Java 换源
 *
 * 参考：https://developer.aliyun.com/mirror/maven
 */
void
pl_java_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  if (xy_on_windows) check_cmd = "mvn --version >nul 2>nul";
  else               check_cmd = "mvn --version 1>/dev/null 2>&1";
  bool mvn_exist_b    = does_the_program_exist (check_cmd, "mvn");

  if (xy_on_windows) check_cmd = "gradle --version >nul 2>nul";
  else               check_cmd = "gradle --version 1>/dev/null 2>&1";
  bool gradle_exist_b = does_the_program_exist (check_cmd, "gradle");

  if (!mvn_exist_b && !gradle_exist_b) {
    xy_error ("chsrc: maven 与 gradle 命令均未找到，请检查是否存在（其一）");
    return;
  }

  for (int i=0;i<sizeof(pl_java_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_java_sources[selected].mirror->name;
  const char* source_abbr = pl_java_sources[selected].mirror->abbr;
  const char* source_url  = pl_java_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  if (mvn_exist_b) {
    const char* file = xy_strjoin(3,
    "<mirror>\n"
    "  <id>aliyunmaven</id>\n"
    "  <mirrorOf>*</mirrorOf>\n"
    "  <name>阿里云公共仓库</name>\n"
    "  <url>", source_url, "</url>\n"
    "</mirror>");

    xy_info ("chsrc: 请在您的 maven安装目录/conf/settings.xml 中添加:\n");
    puts (file);
  }

  if (gradle_exist_b) {
    const char* file = xy_strjoin(3,
    "allprojects {\n"
    "  repositories {\n"
    "  maven { url '", source_url, "' }\n"
    "  mavenLocal()\n"
    "  mavenCentral()\n"
    "  }\n"
    "}");

    xy_info ("chsrc: 请在您的 build.gradle 中添加:\n");
    puts (file);
  }

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}



/**
 * R 换源
 *
 * 参考：https://help.mirrors.cernet.edu.cn/CRAN/
 */
void
pl_r_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  for (int i=0;i<sizeof(pl_r_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_r_sources[selected].mirror->name;
  const char* source_abbr = pl_r_sources[selected].mirror->abbr;
  const char* source_url  = pl_r_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));


  const char* file = xy_strjoin (3, "options(\"repos\" = c(CRAN=\"", source_url, "\"))" );


  char* cmd = NULL;
  // TODO: 待确认，Windows 下是否也是该文件
  if (xy_on_windows)
    cmd = xy_strjoin(3, "echo ", file, " >> %USERPROFILE%/.Rprofile");
  else
    cmd = xy_strjoin(3, "echo ", file, " >> ~/.Rprofile");

  system(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}




/**
 * Julia 换源
 *
 * 参考：https://help.mirrors.cernet.edu.cn/julia/
 */
void
pl_julia_setsrc (char* option)
{
  int selected = 0; char* check_cmd = NULL;

  for (int i=0;i<sizeof(pl_r_sources);i++) {
    // 循环测速
  }

  const char* source_name = pl_r_sources[selected].mirror->name;
  const char* source_abbr = pl_r_sources[selected].mirror->abbr;
  const char* source_url  = pl_r_sources[selected].url;

  xy_info (xy_2strjoin("chsrc: 选中镜像站：", source_abbr));

  const char* file = xy_strjoin (3, "ENV[\"JULIA_PKG_SERVER\"] = \"", source_url, "\"");

  char* cmd = NULL;
  // TODO: $JULIA_DEPOT_PATH/config/startup.jl 是否要考虑环境变量
  if (xy_on_windows)
    cmd = xy_strjoin(3, "echo ", file, " >> %USERPROFILE%/.julia/config/startup.jl");
  else
    cmd = xy_strjoin(3, "echo ", file, " >> ~/.julia/config/startup.jl");
  system(cmd);

  xy_success(xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}




void
os_ubuntu_setsrc (char* option)
{
  int selected = 0;
  for (int i=0;i<sizeof(os_ubuntu_sources);i++) {
    // 循环测速
  }
  const char* source_name = os_ubuntu_sources[selected].mirror->name;
  const char* source_abbr = os_ubuntu_sources[selected].mirror->abbr;
  const char* source_url  = os_ubuntu_sources[selected].url;

  char* backup = "cp -rf /etc/apt/sources.list /etc/apt/sources.list.bak";
  system(backup);

  xy_info ("chsrc: 备份文件名: /etc/apt/sources.list.bak");

  char* cmd = xy_strjoin(3, "sed -E \'s@(^[^#]* .*)http[:|\\.|\\/|a-z|A-Z]*\\/ubuntu\\/@\\1",
                          source_url,
                          "@\'< /etc/apt/sources.list.bak | cat > /etc/apt/sources.list");
  system(cmd);
  free(cmd);

  char* rm = "rm -rf /etc/apt/source.list.bak";
  system(rm);

  xy_info ("chsrc: 为 ubuntu 命令换源");
  xy_success (xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}
void
os_debian_setsrc (char* option)
{
  int selected = 0;
  for (int i=0;i<sizeof(os_ubuntu_sources);i++) {
    // 循环测速
  }
  const char* source_name = os_ubuntu_sources[selected].mirror->name;
  const char* source_abbr = os_ubuntu_sources[selected].mirror->abbr;
  const char* source_url  = os_ubuntu_sources[selected].url;

  char* backup = "cp -rf /etc/apt/sources.list /etc/apt/sources.list.bak";
  system(backup);

  xy_info ("chsrc: 备份文件名: /etc/apt/sources.list.bak");

  char* cmd = xy_strjoin(3, "sed -E \'s@(^[^#]* .*)http[:|\\.|\\/|a-z|A-Z]*\\/debian\\/@\\1",
                          source_url,
                          "@\'< /etc/apt/sources.list.bak | cat > /etc/apt/sources.list");
  system(cmd);
  free(cmd);

  char* rm = "rm -rf /etc/apt/source.list.bak";
  system(rm);

  xy_info ("chsrc: 为 ubuntu 命令换源");
  xy_success (xy_2strjoin("chsrc: 感谢镜像提供方：", source_name));
}


#define  setsrc_fn(func) (const char const*)func
#define  getsrc_fn(func) (const char const*)func
#define sources_ptr(ptr) (const char const*)ptr
static const char const
*pl_ruby  [] = {"gem",   "ruby",    "rb",    "rubygems", NULL,  setsrc_fn(pl_ruby_setsrc) ,   NULL,  sources_ptr(pl_ruby_sources) },
*pl_python[] = {"pip",   "python",  "py",    "pypi",     NULL,  setsrc_fn(pl_python_setsrc),  NULL,  sources_ptr(pl_python_sources)},
*pl_nodejs[] = {"npm",   "node",    "js",    "nodejs",   NULL,  setsrc_fn(pl_nodejs_setsrc),  NULL,  sources_ptr(pl_nodejs_sources)},
*pl_perl  [] = {"perl",  "cpan",                         NULL,  setsrc_fn(pl_perl_setsrc),    NULL,  sources_ptr(pl_perl_sources)},
*pl_rust  [] = {"rust",  "cargo",   "crate",  "crates",  NULL,  setsrc_fn(pl_rust_setsrc),    NULL,  sources_ptr(pl_rust_sources)},
*pl_go    [] = {"go",    "golang",  "goproxy",           NULL,  setsrc_fn(pl_go_setsrc),      NULL,  sources_ptr(pl_go_sources)},
*pl_dotnet[] = {"nuget", "net",     ".net",   "dotnet",  NULL,  setsrc_fn(pl_dotnet_setsrc),  NULL,  sources_ptr(pl_dotnet_sources)},
*pl_java  [] = {"java",  "maven",   "gradle",            NULL,  setsrc_fn(pl_java_setsrc),    NULL,  sources_ptr(pl_java_sources)},
*pl_php   [] = {"php",   "composer",                     NULL,  setsrc_fn(pl_php_setsrc),     NULL,  sources_ptr(pl_php_sources)},
*pl_cran  [] = {"r",     "cran",                         NULL,  setsrc_fn(pl_r_setsrc),       NULL,  sources_ptr(pl_r_sources)},
*pl_julia [] = {"julia",                                 NULL,  setsrc_fn(pl_julia_setsrc),   NULL,  sources_ptr(pl_julia_sources)},
**pl_packagers[] =
{
  pl_ruby,    pl_python,  pl_nodejs,  pl_perl,
  pl_rust,    pl_go,      pl_dotnet,  pl_java,  pl_php,
  pl_cran,    pl_julia
},


*os_ubuntu  [] = {"ubuntu", NULL,  setsrc_fn(os_ubuntu_setsrc),NULL,sources_ptr(os_ubuntu_sources)},
*os_debian  [] = {"debian", NULL,  setsrc_fn(os_debian_setsrc),NULL,sources_ptr(os_debian_sources)},
**os_systems[] =
{
  os_ubuntu,os_debian
},


*wr_anaconda[] = {"conda", "anaconda",         NULL,  NULL},
*wr_tex     [] = {"latex", "ctan",     "tex",  NULL,  NULL},
*wr_emacs   [] = {"emacs",                     NULL,  NULL},
**wr_softwares[] =
{
  wr_anaconda, wr_tex, wr_emacs
};
#undef getsrc_fn
#undef getsrc_fn
#undef sources_ptr



static const char const*
usage[] = {
  "chsrc: Change Source \e[1;35m" Chsrc_Version "\e[0m by \e[4;31mRubyMetric\e[0m\n",

  "维护:  https://gitee.com/RubyMetric/chsrc\n",

  "使用：chsrc <command> [target]",
  "help                  # 打印此帮助，或 h, -h, --help",
  "list (或 ls, 或 l)    # 查看可用镜像源，和可换源软件",
  "list mirror(s)        # 查看可用镜像源",
  "list target(s)        # 查看可换源软件",
  "list <target>         # 查看该软件可以使用哪些源",
  "cesu <target>         # 对该软件所有源测速",
  "get  <target>         # 查看当前软件的源使用情况",
  "set  <target>         # 换源，自动测速后挑选最快源",
  "set  <target> -1      # 1,2,3的1。换源，不测速，挑选经维护者测速排序的第一源",
  "set  <target> -v      # 换源，并打印换源所执行的具体操作\n"
};


void
call_cmd (void* cmdptr, const char* arg)
{
  void (*cmd_func)(const char*) = cmdptr;
  if (NULL==arg) {
    xy_info("chsrc: 将使用默认镜像");
  }
  cmd_func(arg);
}



void
print_available_mirrors ()
{
  xy_info ("chsrc: 支持以下镜像站，荣耀与感恩均归于这些站点，以及它们的开发/维护者们");
  for (int i=0; i<xy_arylen(available_mirrors); i++)
  {
    mirror_info* mir = available_mirrors[i];
    printf ("%-18s%-41s ", mir->abbr, mir->site); puts(mir->name);
  }
}


void
print_supported_targets_ (const char const*** array, size_t size)
{
  for (int i=0; i<size; i++)
  {
    const char ** target = array[i];
    const char* alias = target[0];
    for (int k=1; alias!=NULL; k++)
    {
      printf ("%s\t", alias);
      alias = target[k];
    }
    puts("");
  }
  puts("");
}


void
print_supported_targets ()
{
  xy_info ("chsrc: 支持对以下目标换源 (同一行表示这几个命令兼容)");
  xy_warn ("编程语言开发");
  print_supported_targets_ (pl_packagers, xy_arylen(pl_packagers));
  xy_warn ("操作系统");
  print_supported_targets_ (os_systems,   xy_arylen(os_systems));
  xy_warn ("软件");
  print_supported_targets_ (wr_softwares, xy_arylen(wr_softwares));
}




int
print_help ()
{
  for (int i=0; i<xy_arylen(usage); i++) {
    puts (usage[i]);
  }
}



/**
 * 遍历我们内置的targets列表，查询用户输入`input`是否与我们支持的某个target匹配
 *
 * @param[out]  target_func  如果匹配到，则返回内置targets列表中NULL的位置
 *
 * @return 匹配到则返回true，未匹配到则返回false
 */
bool
iterate_targets_(const char const*** array, size_t size, const char* input, const char const*** target_func)
{
  int matched = 0;

  const char const** target = NULL;
  int k = 0;
  const char* alias = NULL;

  for (int i=0; i<size; i++) {
    target = array[i];
    alias = target[k];
    while (NULL!=alias) {
      if (xy_streql(input, alias)) {
        matched = 1; break;
      }
      k++;
      alias = target[k];
    }
    if (!matched) k = 0;
    if (matched) break;
  }

  if(!matched) {
    *target_func = NULL;
    return false;
  }

  do {
    k++;
    alias = target[k];
  } while (NULL!=alias);
  *target_func = target + k;
  return true;
}

#define iterate_targets(ary, input, target_func) iterate_targets_(ary, xy_arylen(ary), input, target_func)

#define Target_Set_Source   1
#define Target_Get_Source   2
#define Target_List_Sources 3

/**
 * 寻找target，并根据`code`执行相应的操作
 *
 * @param[in]  input  用户输入的目标
 * @param[in]  code   对target要执行的操作
 *
 * @return 找到目标返回true，未找到返回false
 */
bool
get_target (const char* input, int code)
{
  const char const** target_func = NULL;

           bool matched = iterate_targets(pl_packagers, input, &target_func);
  if (!matched) matched = iterate_targets(os_systems,   input, &target_func);
  if (!matched) matched = iterate_targets(wr_softwares, input, &target_func);

  if (!matched) {
    return false;
  }

  if (Target_Set_Source==code) {
    puts("chsrc: 对该软件换源");
    // call_cmd ((void*) target_func+code, NULL);
  }
  else if (Target_Get_Source==code) {
    puts("chsrc: 查看该软件的换源情况");
  }
  else if (Target_List_Sources==code) {
    puts("chsrc: 列出该软件所有可用镜像站");
  }
  return true;
}



int
main (int argc, char const *argv[])
{
  xy_useutf8(); argc -= 1;

  if (argc==0) {
    print_help(); return 0;
  }

  const char* command = argv[1];
  const char* target  = NULL;

  bool matched = false;

  /* chsrc help */
  if (xy_streql(command, "h")  ||
      xy_streql(command, "-h") ||
      xy_streql(command, "help") ||
      xy_streql(command, "--help"))
  {
    print_help();
    return 0;
  }

  /* chsrc list */
  else if (xy_streql(command, "list") ||
           xy_streql(command, "l")    ||
           xy_streql(command, "ls"))
  {
    if (argc < 2) {
      print_available_mirrors();
      puts("");
      print_supported_targets();
    } else {

      if (xy_streql(argv[2],"mirrors")) {
        print_available_mirrors(); return 0;
      }
      if (xy_streql(argv[2],"mirror"))  {
        print_available_mirrors(); return 0;
      }
      if (xy_streql(argv[2],"targets")) {
        print_supported_targets(); return 0;
      }
      if (xy_streql(argv[2],"target"))  {
        print_supported_targets(); return 0;
      }
      matched = get_target(argv[2], Target_List_Sources);
      if (!matched) goto not_matched;
    }
    return 0;
  }


  /* chsrc cesu */
  else if (xy_streql(command, "cesu") ||
           xy_streql(command, "ce")   ||
           xy_streql(command, "c"))
  {
    if (argc < 2) {
      xy_error ("chsrc: 请您提供想要测速源的软件名; 使用 chsrc list targets 查看所有支持的软件");
      return 1;
    }
    // TODO:
    // matched = get_target(argv[2],);
    // if (!matched) goto not_matched;
    puts("chsrc: 测试提供该软件源的镜像站点速度");
    return 0;
  }


  /* chsrc get */
  else if (xy_streql(command, "get") ||
           xy_streql(command, "g"))
  {
    if (argc < 2) {
      xy_error ("chsrc: 请您提供想要查看源的软件名; 使用 chsrc list targets 查看所有支持的软件");
      return 1;
    }
    matched = get_target(argv[2], Target_Get_Source);
    if (!matched) goto not_matched;
    return 0;
  }

  /* chsrc set */
  else if (xy_streql(command, "set") ||
           xy_streql(command, "s"))
  {
    if (argc < 2) {
      xy_error ("chsrc: 请您提供想要设置源的软件名; 使用 chsrc list targets 查看所有支持的软件");
      return 1;
    }
    matched = get_target(argv[2], Target_Set_Source);
    if (!matched) goto not_matched;
    return 0;
  }

  /* 不支持的命令 */
  else
  {
    xy_error ("chsrc: 不支持的命令，请使用 chsrc help 查看使用方式");
    return 1;
  }

not_matched:
  if (!matched) {
    xy_info("chsrc: 暂不支持的换源目标，请使用 chsrc list targets 查看可换源软件");
    return 1;
  }
}