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/*****
* interact.cc
*
* The glue between the lexical analyzer and the readline library.
*****/
#include <cstdlib>
#include <cassert>
#include <iostream>
#include <sstream>
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>
#include <csignal>
#include "interact.h"
#include "runhistory.h"
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
#include <cstdio>
#include <readline/readline.h>
#include <readline/history.h>
#endif
#include "util.h"
#include "errormsg.h"
using namespace settings;
namespace run {
void init_readline(bool);
}
namespace interact {
bool interactive=false;
bool uptodate=true;
int lines=0;
bool query=false;
bool tty=isatty(STDIN_FILENO);
completer *currentCompleter=0;
void setCompleter(completer *c) {
currentCompleter=c;
}
char *call_completer(const char *text, int state) {
return currentCompleter ? (*currentCompleter)(text, state) : 0;
}
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
void init_completion() {
rl_completion_entry_function=call_completer;
rl_completion_append_character='\0'; // Don't add a space after a match.
// Build a string containing all characters that separate words to be
// completed. All characters that can't form part of an identifier are
// treated as break characters.
static char break_characters[128];
Int j=0;
for (unsigned char c=9; c<128; ++c)
if (!isalnum(c) && c != '_') {
break_characters[j]=c;
++j;
}
break_characters[j]='\0';
rl_completer_word_break_characters=break_characters;
}
#endif
char *(*Readline)(const char *prompt);
char *verbatimreadline(const char *prompt)
{
if(!cin.good()) {cin.clear(); return NULL;}
cout << prompt;
string s;
getline(cin,s);
return StrdupMalloc(s);
}
void pre_readline()
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
if(tty) {
Readline=readline;
} else
#endif
Readline=verbatimreadline;
}
void init_interactive()
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
if(tty) {
init_completion();
run::init_readline(getSetting<bool>("tabcompletion"));
read_history(historyname.c_str());
}
#endif
}
string simpleline(string prompt) {
// Rebind tab key, as the setting tabcompletion may be changed at runtime.
pre_readline();
// Get a line from the user.
char *line=Readline(prompt.c_str());
// Reset scroll count.
interact::lines=0;
interact::query=tty;
// Ignore keyboard interrupts while taking input.
errorstream::interrupt=false;
if(line) {
string s=line;
free(line);
return s;
} else {
cout << endl;
if(!tty || getSetting<bool>("exitonEOF"))
throw eof();
return "\n";
}
}
void addToHistory(string line) {
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
// Only add it if it has something other than newlines.
if(tty && line.find_first_not_of('\n') != string::npos) {
add_history(line.c_str());
}
#endif
}
string getLastHistoryLine() {
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
if(tty && history_length > 0) {
HIST_ENTRY *entry=history_list()[history_length-1];
if(!entry) {
em.compiler();
em << "cannot access last history line";
return "";
} else
return entry->line;
} else
#endif
return "";
}
void setLastHistoryLine(string line) {
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
if(tty) {
if (history_length > 0) {
HIST_ENTRY *entry=remove_history(history_length-1);
if(!entry) {
em.compiler();
em << "cannot modify last history line";
} else {
free(entry->line);
free(entry);
}
}
addToHistory(line);
}
#endif
}
void deleteLastLine() {
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
if(tty) {
HIST_ENTRY *entry=remove_history(history_length-1);
if(!entry) {
em.compiler();
em << "cannot delete last history line";
} else {
free(entry->line);
free(entry);
}
}
#endif
}
void cleanup_interactive() {
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
// Write the history file.
if(tty) {
stifle_history(intcast(getSetting<Int>("historylines")));
write_history(historyname.c_str());
}
#endif
}
} // namespace interact
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