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/*****
* runhistory.in
*
* Runtime functions for history operations.
*
*****/
pair => primPair()
picture* => primPicture()
stringarray* => stringArray()
#include "array.h"
#include "mathop.h"
using namespace camp;
using namespace settings;
using namespace vm;
using namespace run;
typedef array stringarray;
using types::stringArray;
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
#include <readline/readline.h>
#include <readline/history.h>
struct historyState {
bool store;
HISTORY_STATE state;
};
typedef mem::map<CONST string, historyState> historyMap_t;
historyMap_t historyMap;
static HISTORY_STATE history_save;
// Store a deep copy of the current readline history in dest.
void store_history(HISTORY_STATE *dest)
{
HISTORY_STATE *src=history_get_history_state();
if(src) {
*dest=*src;
for(Int i=0; i < src->length; ++i)
dest->entries[i]=src->entries[i];
free(src);
}
}
stringarray* get_history(Int n)
{
int N=intcast(n);
if(N <= 0) N=history_length;
else N=Min(N,history_length);
array *a=new array((size_t) N);
int offset=history_length-N+1;
for(int i=0; i < N; ++i) {
HIST_ENTRY *last=history_get(offset+i);
string s=last ? last->line : "";
(*a)[i]=s;
}
return a;
}
string historyfilename(const string &name)
{
return historyname+"_"+name;
}
#endif
namespace run {
extern string emptystring;
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
void init_readline(bool tabcompletion)
{
rl_bind_key('\t',tabcompletion ? rl_complete : rl_insert);
}
#endif
void cleanup()
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
store_history(&history_save);
int nlines=intcast(getSetting<Int>("historylines"));
for(historyMap_t::iterator h=historyMap.begin(); h != historyMap.end();
++h) {
history_set_history_state(&h->second.state);
stifle_history(nlines);
if(h->second.store) write_history(historyfilename(h->first).c_str());
}
history_set_history_state(&history_save);
#endif
}
}
// Autogenerated routines:
// Return the last n lines of the history named name.
stringarray* history(string name, Int n=1)
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
bool newhistory=historyMap.find(name) == historyMap.end();
string filename;
if(newhistory) {
filename=historyfilename(name);
std::ifstream exists(filename.c_str());
if(!exists) return new array(0);
}
store_history(&history_save);
HISTORY_STATE& history=historyMap[name].state;
history_set_history_state(&history);
if(newhistory)
read_history(filename.c_str());
array *a=get_history(n);
store_history(&history);
history_set_history_state(&history_save);
return a;
#else
unused(&n);
return new array(0);
#endif
}
// Return the last n lines of the interactive history.
stringarray* history(Int n=0)
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
return get_history(n);
#else
unused(&n);
return new array(0);
#endif
}
// Prompt for a string using prompt, the GNU readline library, and a
// local history named name.
string readline(string prompt=emptystring, string name=emptystring,
bool tabcompletion=false)
{
if(!(isatty(STDIN_FILENO) || getSetting<bool>("interactive")))
return emptystring;
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
init_readline(tabcompletion);
store_history(&history_save);
bool newhistory=historyMap.find(name) == historyMap.end();
historyState& h=historyMap[name];
HISTORY_STATE& history=h.state;
history_set_history_state(&history);
if(newhistory)
read_history(historyfilename(name).c_str());
static char *line=NULL;
/* Return the memory to the free pool
if the buffer has already been allocated. */
if(line) {
free(line);
line=NULL;
}
/* Get a line from the user. */
line=readline(prompt.c_str());
if(!line) cout << endl;
history_set_history_state(&history_save);
return line ? string(line) : emptystring;
#else
cout << prompt;
string s;
getline(cin,s);
unused(&tabcompletion); // Avoid unused variable warning message.
return s;
#endif
}
// Save a string in a local history named name.
// If store=true, store the local history in the file historyfilename(name).
void saveline(string name, string value, bool store=true)
{
#if defined(HAVE_LIBREADLINE) && defined(HAVE_LIBCURSES)
store_history(&history_save);
bool newhistory=historyMap.find(name) == historyMap.end();
historyState& h=historyMap[name];
h.store=store;
HISTORY_STATE& history=h.state;
history_set_history_state(&history);
if(newhistory)
read_history(historyfilename(name).c_str());
if(value != "") {
add_history(value.c_str());
if(store) {
std::ofstream hout(historyfilename(name).c_str(),std::ios::app);
hout << value << endl;
}
}
store_history(&history);
history_set_history_state(&history_save);
#else
unused(&store);
#endif
}
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