jim-interactive.c

   1 #include <errno.h>
   2 #include <string.h>
   3
   4 #include "jimautoconf.h"
   5 #include <jim.h>
   6
   7 #ifdef USE_LINENOISE
   8 #ifdef HAVE_UNISTD_H
   9     #include <unistd.h>
  10 #endif
  11 #ifdef HAVE_SYS_STAT_H
  12     #include <sys/stat.h>
  13 #endif
  14 #include "linenoise.h"
  15 #else
  16 #define MAX_LINE_LEN 512
  17 #endif
  18
  19 #ifdef USE_LINENOISE
  20 static void JimCompletionCallback(const char *prefix, linenoiseCompletions *comp, void *userdata);
  21 static const char completion_callback_assoc_key[] = "interactive-completion";
  22 #endif
  23
  24 /**
  25  * Returns an allocated line, or NULL if EOF.
  26  */
  27 char *Jim_HistoryGetline(Jim_Interp *interp, const char *prompt)
  28 {
  29 #ifdef USE_LINENOISE
  30     struct JimCompletionInfo *compinfo = Jim_GetAssocData(interp, completion_callback_assoc_key);
  31     char *result;
  32     Jim_Obj *objPtr;
  33     long mlmode = 0;
  34     /* Set any completion callback just during the call to linenoise()
  35      * to allow for per-interp settings
  36      */
  37     if (compinfo) {
  38         linenoiseSetCompletionCallback(JimCompletionCallback, compinfo);
  39     }
  40     objPtr = Jim_GetVariableStr(interp, "history::multiline", JIM_NONE);
  41     if (objPtr && Jim_GetLong(interp, objPtr, &mlmode) == JIM_NONE) {
  42         linenoiseSetMultiLine(mlmode);
  43     }
  44
  45     result = linenoise(prompt);
  46     /* unset the callback */
  47     linenoiseSetCompletionCallback(NULL, NULL);
  48     return result;
  49 #else
  50     int len;
  51     char *line = malloc(MAX_LINE_LEN);
  52
  53     fputs(prompt, stdout);
  54     fflush(stdout);
  55
  56     if (fgets(line, MAX_LINE_LEN, stdin) == NULL) {
  57         free(line);
  58         return NULL;
  59     }
  60     len = strlen(line);
  61     if (len && line[len - 1] == '\n') {
  62         line[len - 1] = '\0';
  63     }
  64     return line;
  65 #endif
  66 }
  67
  68 void Jim_HistoryLoad(const char *filename)
  69 {
  70 #ifdef USE_LINENOISE
  71     linenoiseHistoryLoad(filename);
  72 #endif
  73 }
  74
  75 void Jim_HistoryAdd(const char *line)
  76 {
  77 #ifdef USE_LINENOISE
  78     linenoiseHistoryAdd(line);
  79 #endif
  80 }
  81
  82 void Jim_HistorySave(const char *filename)
  83 {
  84 #ifdef USE_LINENOISE
  85 #ifdef HAVE_UMASK
  86     mode_t mask;
  87     /* Just u=rw, but note that this is only effective for newly created files */
  88     mask = umask(S_IXUSR | S_IRWXG | S_IRWXO);
  89 #endif
  90     linenoiseHistorySave(filename);
  91 #ifdef HAVE_UMASK
  92     mask = umask(mask);
  93 #endif
  94 #endif
  95 }
  96
  97 void Jim_HistoryShow(void)
  98 {
  99 #ifdef USE_LINENOISE
 100     /* built-in history command */
 101     int i;
 102     int len;
 103     char **history = linenoiseHistory(&len);
 104     for (i = 0; i < len; i++) {
 105         printf("%4d %s\n", i + 1, history[i]);
 106     }
 107 #endif
 108 }
 109
 110 #ifdef USE_LINENOISE
 111 struct JimCompletionInfo {
 112     Jim_Interp *interp;
 113     Jim_Obj *command;
 114 };
 115
 116 static void JimCompletionCallback(const char *prefix, linenoiseCompletions *comp, void *userdata)
 117 {
 118     struct JimCompletionInfo *info = (struct JimCompletionInfo *)userdata;
 119     Jim_Obj *objv[2];
 120     int ret;
 121
 122     objv[0] = info->command;
 123     objv[1] = Jim_NewStringObj(info->interp, prefix, -1);
 124
 125     ret = Jim_EvalObjVector(info->interp, 2, objv);
 126
 127     /* XXX: Consider how best to handle errors here. bgerror? */
 128     if (ret == JIM_OK) {
 129         int i;
 130         Jim_Obj *listObj = Jim_GetResult(info->interp);
 131         int len = Jim_ListLength(info->interp, listObj);
 132         for (i = 0; i < len; i++) {
 133             linenoiseAddCompletion(comp, Jim_String(Jim_ListGetIndex(info->interp, listObj, i)));
 134         }
 135     }
 136 }
 137
 138 static void JimHistoryFreeCompletion(Jim_Interp *interp, void *data)
 139 {
 140     struct JimCompletionInfo *compinfo = data;
 141
 142     Jim_DecrRefCount(interp, compinfo->command);
 143
 144     Jim_Free(compinfo);
 145 }
 146 #endif
 147
 148 /**
 149  * Sets a completion command to be used with Jim_HistoryGetline()
 150  * If commandObj is NULL, deletes any existing completion command.
 151  */
 152 void Jim_HistorySetCompletion(Jim_Interp *interp, Jim_Obj *commandObj)
 153 {
 154 #ifdef USE_LINENOISE
 155     if (commandObj) {
 156         /* Increment now in case the existing object is the same */
 157         Jim_IncrRefCount(commandObj);
 158     }
 159
 160     Jim_DeleteAssocData(interp, completion_callback_assoc_key);
 161
 162     if (commandObj) {
 163         struct JimCompletionInfo *compinfo = Jim_Alloc(sizeof(*compinfo));
 164         compinfo->interp = interp;
 165         compinfo->command = commandObj;
 166
 167         Jim_SetAssocData(interp, completion_callback_assoc_key, JimHistoryFreeCompletion, compinfo);
 168     }
 169 #endif
 170 }
 171
 172 int Jim_InteractivePrompt(Jim_Interp *interp)
 173 {
 174     int retcode = JIM_OK;
 175     char *history_file = NULL;
 176 #ifdef USE_LINENOISE
 177     const char *home;
 178
 179     home = getenv("HOME");
 180     if (home && isatty(STDIN_FILENO)) {
 181         int history_len = strlen(home) + sizeof("/.jim_history");
 182         history_file = Jim_Alloc(history_len);
 183         snprintf(history_file, history_len, "%s/.jim_history", home);
 184         Jim_HistoryLoad(history_file);
 185     }
 186
 187     Jim_HistorySetCompletion(interp, Jim_NewStringObj(interp, "tcl::autocomplete", -1));
 188 #endif
 189
 190     printf("Welcome to Jim version %d.%d\n",
 191         JIM_VERSION / 100, JIM_VERSION % 100);
 192     Jim_SetVariableStrWithStr(interp, JIM_INTERACTIVE, "1");
 193
 194     while (1) {
 195         Jim_Obj *scriptObjPtr;
 196         const char *result;
 197         int reslen;
 198         char prompt[20];
 199
 200         if (retcode != JIM_OK) {
 201             const char *retcodestr = Jim_ReturnCode(retcode);
 202
 203             if (*retcodestr == '?') {
 204                 snprintf(prompt, sizeof(prompt) - 3, "[%d] . ", retcode);
 205             }
 206             else {
 207                 snprintf(prompt, sizeof(prompt) - 3, "[%s] . ", retcodestr);
 208             }
 209         }
 210         else {
 211             strcpy(prompt, ". ");
 212         }
 213
 214         scriptObjPtr = Jim_NewStringObj(interp, "", 0);
 215         Jim_IncrRefCount(scriptObjPtr);
 216         while (1) {
 217             char state;
 218             char *line;
 219
 220             line = Jim_HistoryGetline(interp, prompt);
 221             if (line == NULL) {
 222                 if (errno == EINTR) {
 223                     continue;
 224                 }
 225                 Jim_DecrRefCount(interp, scriptObjPtr);
 226                 retcode = JIM_OK;
 227                 goto out;
 228             }
 229             if (Jim_Length(scriptObjPtr) != 0) {
 230                 /* Line continuation */
 231                 Jim_AppendString(interp, scriptObjPtr, "\n", 1);
 232             }
 233             Jim_AppendString(interp, scriptObjPtr, line, -1);
 234             free(line);
 235             if (Jim_ScriptIsComplete(interp, scriptObjPtr, &state))
 236                 break;
 237
 238             snprintf(prompt, sizeof(prompt), "%c> ", state);
 239         }
 240 #ifdef USE_LINENOISE
 241         if (strcmp(Jim_String(scriptObjPtr), "h") == 0) {
 242             /* built-in history command */
 243             Jim_HistoryShow();
 244             Jim_DecrRefCount(interp, scriptObjPtr);
 245             continue;
 246         }
 247
 248         Jim_HistoryAdd(Jim_String(scriptObjPtr));
 249         if (history_file) {
 250             Jim_HistorySave(history_file);
 251         }
 252 #endif
 253         retcode = Jim_EvalObj(interp, scriptObjPtr);
 254         Jim_DecrRefCount(interp, scriptObjPtr);
 255
 256         if (retcode == JIM_EXIT) {
 257             break;
 258         }
 259         if (retcode == JIM_ERR) {
 260             Jim_MakeErrorMessage(interp);
 261         }
 262         result = Jim_GetString(Jim_GetResult(interp), &reslen);
 263         if (reslen) {
 264             printf("%s\n", result);
 265         }
 266     }
 267   out:
 268     Jim_Free(history_file);
 269
 270     return retcode;
 271 }