Efiler: Add mimetype handling via mailcap file. Context menu can now recognize several operation depending on file type

efiler/mailcap.cpp

@@ -0,0 +1,213 @@
+/*
+ * $Id$
+ *
+ * EFiler - EDE File Manager
+ * Part of Equinox Desktop Environment (EDE).
+ * Copyright (c) 2000-2007 EDE Authors.
+ *
+ * This program is licenced under terms of the
+ * GNU General Public Licence version 2 or newer.
+ * See COPYING for details.
+ */
+
+
+// References:
+// [1] Mutt documentation, chapter on mailcap
+// http://www.mutt.org/doc/manual/manual-5.html
+// [2] RFC 1524
+// http://www.faqs.org/rfcs/rfc1524.html
+
+
+#include "mailcap.h"
+
+#include <edelib/String.h>
+#include <edelib/List.h>
+#include <edelib/Util.h>
+#include <edelib/Directory.h>
+#include <edelib/File.h>
+#include <edelib/StrUtil.h>
+
+#include <stdio.h>
+
+// See: [2] Appendix A
+#define MAILCAPS "/etc/mailcap:/usr/etc/mailcap:/usr/local/etc/mailcap"
+
+// FIXME: use favourite aplications to find xterm
+#define TERM "xterm"
+
+
+using namespace edelib; // this drastically shortened the code...
+
+
+struct mime_db_struct {
+	String type;
+	String viewcmd;
+	String createcmd;
+	String editcmd;
+	String printcmd;
+};
+
+list<mime_db_struct> mime_db;
+bool files_read=false;
+
+
+// Expand various macros in mailcap command spec and prevent
+// certain security issues
+
+String mailcap_sanitize(char* cmd, String type) {
+	String s(cmd);
+	unsigned int k = s.find("%s");
+
+	// no %s, file should be piped to stdin
+	if (k==String::npos) { 
+		s = String("cat '%s' | ") + cmd;
+	} else {
+		// replace %s with '%s' (see: [1])
+		while (k!=String::npos) {
+			s = s.substr(0,k)+ "'%s'" + s.substr(k+2);
+			k = s.find("%s",k+2);
+		}
+	}
+
+	// replace %t with mimetype
+	k = s.find("%t");
+	while (k!=String::npos) {
+		s = s.substr(0,k) + type + s.substr(k+2);
+		k = s.find("%t",k+1);
+	}
+	// we don't know the charset
+	k = s.find("%{charset}");
+	while (k!=String::npos) {
+		s = s.substr(0,k) + "us-ascii" + s.substr(k+10);
+		k = s.find("%{charset}",k+1);
+	}
+	// ignore other mutt specific codes
+	k = s.find("%{");
+	while (k!=String::npos) {
+		s = s.substr(0,k) + s.substr(k+2);
+		k = s.find("}",k); // there has to be a closing brace...
+		if (k!=String::npos) s= s.substr(0,k) + s.substr(k+1);
+		k = s.find("%{",k);
+	}
+	return s;
+}
+
+
+void read_files() {
+	list<String> locations;
+
+	// RFC compliant list of mailcap locations
+	stringtok(locations, String(MAILCAPS), ":");
+	// Add ~/.mailcap
+	locations.push_front(dir_home() + E_DIR_SEPARATOR_STR".mailcap");
+	// Add EDE specific configuracion
+	if (user_config_dir() != "") 
+		locations.push_front(user_config_dir() + E_DIR_SEPARATOR_STR"ede"E_DIR_SEPARATOR_STR"mailcap");
+
+	// Test all these locations
+	const char* mailcap = NULL;
+	{
+		list<String>::iterator it = locations.begin(), it_end = locations.end();
+	
+		for(; it != it_end; ++it) {
+			if (file_exists((*it).c_str())) {
+				mailcap=(*it).c_str();
+				break;
+			}
+		}
+	}
+	fprintf (stderr, " ------ mailcap: %s\n",mailcap);
+
+	// Read data into list
+	FILE *fp = fopen(mailcap,"r");
+	char buffer[1000];
+	while (fgets(buffer,1000,fp)) {
+		str_trim(buffer);
+		if (buffer[0]=='#') continue; //comment
+		if (strlen(buffer)<2) continue; //empty line
+		
+		// Multiline
+		if (buffer[strlen(buffer)-1]=='\\') {
+			String line(buffer); //Use string for dynamic growing
+			while (fgets(buffer,1000,fp)) {
+				str_trim(buffer);
+				line = line.substr(0, line.length()-2);
+				line += buffer;
+				if (buffer[strlen(buffer)-1]!='\\') break;
+			}
+			// Use just the first 1000 chars
+			strncpy(buffer, line.c_str(), 1000);
+			buffer[999]='\0';
+		}
+
+		// Parse line
+		mime_db_struct parsed;
+		char *tmp = strtok(buffer, ";");
+		str_trim(tmp);
+		parsed.type=tmp;
+
+		// View command
+		tmp = strtok(NULL, ";");
+		if (tmp==NULL) continue; // no view cmd in line!?
+		str_trim(tmp);
+		parsed.viewcmd = mailcap_sanitize(tmp, parsed.type);
+
+		// Other mailcap parameters...
+		while ((tmp = strtok(NULL, ";")) != NULL) {
+			str_trim(tmp);
+			if (strcmp(tmp,"copiousoutput")==0)
+				// TODO: use enotepad? when it supports stdin
+				parsed.viewcmd = TERM" -e \"" + parsed.viewcmd + " | less\"";
+			else if (strcmp(tmp,"needsterminal")==0)
+				parsed.viewcmd = TERM" -e \"" + parsed.viewcmd + "\"";
+			else if (strncmp(tmp,"compose=",8)==0)
+				parsed.createcmd = mailcap_sanitize(tmp+8, parsed.type);
+			else if (strncmp(tmp,"print=",6)==0)
+				parsed.printcmd = mailcap_sanitize(tmp+6, parsed.type);
+			else if (strncmp(tmp,"edit=",5)==0)
+				parsed.editcmd = mailcap_sanitize(tmp+5, parsed.type);
+			// We ignore other parameters
+		}
+		mime_db.push_back(parsed);
+	}
+	fclose(fp);
+
+	files_read=true;
+}
+
+list<mime_db_struct>::iterator find_type(const char* type) {
+	list<mime_db_struct>::iterator it = mime_db.begin(), it_end = mime_db.end();
+	for(; it != it_end; ++it)
+		if ((*it).type==type) return it;
+
+	it = mime_db.begin();
+	for(; it != it_end; ++it) {
+		String s((*it).type);
+		if (s[s.length()-1]=='*' && strncmp(type, s.c_str(), s.length()-1)==0) 
+			return it;
+	}
+	return 0;
+}
+
+const char* mailcap_opener(const char* type, MailcapAction action) { 
+	if (!files_read) read_files(); 
+	list<mime_db_struct>::iterator it = find_type(type);
+	if (it==0) return 0;
+	if (action==MAILCAP_VIEW) return (*it).viewcmd.c_str();
+	else if (action==MAILCAP_CREATE) return (*it).createcmd.c_str();
+	else if (action==MAILCAP_EDIT) return (*it).editcmd.c_str();
+	else if (action==MAILCAP_PRINT) return (*it).printcmd.c_str();
+	else return 0;
+}
+
+int mailcap_actions(const char* type) {
+	if (!files_read) read_files(); 
+	list<mime_db_struct>::iterator it = find_type(type);
+	if (it==0) return 0;
+	int result=0;
+	if ((*it).viewcmd != "") result += MAILCAP_VIEW;
+	if ((*it).createcmd != "") result += MAILCAP_CREATE;
+	if ((*it).editcmd != "") result += MAILCAP_EDIT;
+	if ((*it).printcmd != "") result += MAILCAP_PRINT;
+	return result;
+}