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+/*
+** Copyright (c) 2016 D. Richard Hipp
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the Simplified BSD License (also
+** known as the "2-Clause License" or "FreeBSD License".)
+
+** This program is distributed in the hope that it will be useful,
+** but without any warranty; without even the implied warranty of
+** merchantability or fitness for a particular purpose.
+**
+** Author contact information:
+**   drh@hwaci.com
+**   http://www.hwaci.com/drh/
+**
+*******************************************************************************
+**
+** This module contains the code that implements the "fossil shell" command.
+**
+** The fossil shell prompts for lines of user input, then parses each line
+** after the fashion of a standard Bourne shell and forks a child process
+** to run the corresponding Fossil command.  This only works on Unix.
+**
+** The "fossil shell" command is intended for use with SEE-enabled fossil.
+** It allows multiple commands to be issued without having to reenter the
+** crypto passphrase for each command.
+*/
+#include "config.h"
+#include "fshell.h"
+#include <ctype.h>
+
+#ifndef _WIN32
+# include "linenoise.h"
+# include <sys/types.h>
+# include <sys/wait.h>
+#endif
+
+
+/*
+** COMMAND: shell*
+**
+** Usage: %fossil shell
+**
+** Prompt for lines of input from stdin.  Parse each line and evaluate
+** it as a separate fossil command, in a child process.  The initial
+** "fossil" is omitted from each line.
+**
+** This command only works on unix-like platforms that support fork().
+** It is non-functional on Windows.
+*/
+void shell_cmd(void){
+#ifdef _WIN32
+  fossil_fatal("the 'shell' command is not supported on windows");
+#else
+  int nArg;
+  int mxArg = 0;
+  int n, i;
+  char **azArg = 0;
+  int fDebug;
+  pid_t childPid;
+  char *zLine = 0;
+  char *zPrompt = 0;
+  fDebug = find_option("debug", 0, 0)!=0;
+  db_find_and_open_repository(OPEN_ANY_SCHEMA|OPEN_OK_NOT_FOUND, 0);
+  if(g.zRepositoryName!=0){
+    zPrompt = mprintf("fossil (%z)> ", db_get("project-name","unnamed"));
+  }else{
+    zPrompt = mprintf("fossil (no repo)> ");
+  }
+  db_close(0);
+  sqlite3_shutdown();
+  linenoiseSetMultiLine(1);
+  while( (free(zLine), zLine = linenoise(zPrompt)) ){
+    /* Remember shell history within the current session */
+    linenoiseHistoryAdd(zLine);
+
+    /* Parse the line of input */
+    n = (int)strlen(zLine);
+    for(i=0, nArg=1; i<n; i++){
+      while( fossil_isspace(zLine[i]) ){ i++; }
+      if( i>=n ) break;
+      if( nArg>=mxArg ){
+        mxArg = nArg+10;
+        azArg = fossil_realloc(azArg, sizeof(char*)*mxArg);
+        if( nArg==1 ) azArg[0] = g.argv[0];
+      }
+      if( zLine[i]=='"' || zLine[i]=='\'' ){
+        char cQuote = zLine[i];
+        i++;
+        azArg[nArg++] = &zLine[i];
+        for(i++; i<n && zLine[i]!=cQuote; i++){}
+      }else{
+        azArg[nArg++] = &zLine[i];
+        while( i<n && !fossil_isspace(zLine[i]) ){ i++; }
+      }
+      zLine[i] = 0;
+    }
+
+    /* If the --debug flag was used, display the parsed arguments */
+    if( fDebug ){
+      for(i=1; i<nArg; i++){
+        fossil_print("argv[%d] = [%s]\n", i, azArg[i]);
+      }
+    }
+
+    /* Special cases */
+    if( nArg<2 ) continue;
+    if( fossil_strcmp(azArg[1],"exit")==0 ) break;
+
+    /* Fork a process to handle the command */
+    childPid = fork();
+    if( childPid<0 ){
+      printf("could not fork a child process to handle the command\n");
+      fflush(stdout);
+      continue;
+    }
+    if( childPid==0 ){
+      /* This is the child process */
+      int main(int, char**);
+      fossil_main(nArg, azArg);
+      exit(0);
+    }else{
+      /* The parent process */
+      int status;
+      waitpid(childPid, &status, 0);
+    }
+  }
+  free(zPrompt);
+#endif
+}