apt-private/private-utils.cc

   1 #include <config.h>
   2
   3 #include <apt-pkg/configuration.h>
   4 #include <apt-pkg/fileutl.h>
   5
   6 #include <apt-private/private-utils.h>
   7
   8 #include <cstdlib>
   9 #include <unistd.h>
  10
  11 // DisplayFileInPager - Display File with pager                         /*{{{*/
  12 bool DisplayFileInPager(std::string const &filename)
  13 {
  14    pid_t Process = ExecFork();
  15    if (Process == 0)
  16    {
  17       const char *Args[3];
  18       Args[1] = filename.c_str();
  19       Args[2] = NULL;
  20       if (isatty(STDOUT_FILENO) == 1)
  21       {
  22          // likely installed, provided by sensible-utils
  23          std::string const pager = _config->Find("Dir::Bin::Pager",
  24                "sensible-pager");
  25          Args[0] = pager.c_str();
  26          execvp(Args[0],(char **)Args);
  27          // lets try some obvious alternatives
  28          Args[0] = getenv("PAGER");
  29          if (Args[0] != NULL)
  30             execvp(Args[0],(char **)Args);
  31
  32          Args[0] = "pager";
  33          execvp(Args[0],(char **)Args);
  34       }
  35       // we could read the file ourselves, but… meh
  36       Args[0] = "cat";
  37       execvp(Args[0],(char **)Args);
  38       exit(100);
  39    }
  40
  41    // Wait for the subprocess
  42    return ExecWait(Process, "pager", false);
  43 }
  44                                                                         /*}}}*/
  45 // EditFileInSensibleEditor - Edit File with editor                     /*{{{*/
  46 bool EditFileInSensibleEditor(std::string const &filename)
  47 {
  48    pid_t Process = ExecFork();
  49    if (Process == 0)
  50    {
  51       // likely installed, provided by sensible-utils
  52       std::string const editor = _config->Find("Dir::Bin::Editor",
  53             "sensible-editor");
  54       const char *Args[3];
  55       Args[0] = editor.c_str();
  56       Args[1] = filename.c_str();
  57       Args[2] = NULL;
  58       execvp(Args[0],(char **)Args);
  59       // the usual suspects we can try as an alternative
  60       Args[0] = getenv("VISUAL");
  61       if (Args[0] != NULL)
  62          execvp(Args[0],(char **)Args);
  63
  64       Args[0] = getenv("EDITOR");
  65       if (Args[0] != NULL)
  66          execvp(Args[0],(char **)Args);
  67
  68       Args[0] = "editor";
  69       execvp(Args[0],(char **)Args);
  70       exit(100);
  71    }
  72
  73    // Wait for the subprocess
  74    return ExecWait(Process, "editor", false);
  75 }
  76                                                                         /*}}}*/