Revision 0:ae9f1dd56e92, committed 2013-10-08

Comitter:

garfunkheul

Date:

Tue Oct 08 20:14:17 2013 +0000

Commit message:

this is the first commit, introducing literm. Literm is a small terminal for the mbed which supports: simple command adding, auto help, small history, ctrl+c and ctrl+d.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/literm.cpp	Tue Oct 08 20:14:17 2013 +0000
@@ -0,0 +1,176 @@
+#include "literm.h"
+#include "mbed.h"
+
+void literm::redraw(const char *line)
+{
+    out->printf("\x1B[1K");     /* Clear line */
+    out->printf("\x1B[140D");   /* Move cursor to Left */
+    out->printf("%s%s", prompt, line);
+}
+
+int do_help(literm *term, char *args)
+{
+    struct literm_cmd *pcmd = term->get_cmds();
+    Serial *out = term->get_out();
+
+    while (pcmd->prev != NULL) {
+        out->printf("\r\n%s - %s", pcmd->name, pcmd->desc);
+        pcmd = pcmd->prev;
+    }
+
+    return 0;
+}
+
+literm::literm(Serial *_out)
+{
+    out = _out;
+    
+    /* Register default config */
+    sprintf(prompt, "mbed > ");
+    sprintf(welcome, "\r\n\r\nHello from literm library");
+    
+    /* Register Help command which is the first one */
+    sprintf(help_cmd.name, "help");
+    help_cmd.prev = NULL;    
+    help_cmd.func = do_help;
+    cmd_list = &help_cmd;
+}
+
+void literm::loop()
+{
+    int hist_begin = -1; /* -1 = empty hist */
+    int hist_end = 0;
+    int hist_cur;
+    int hist_full = 0;
+    char hist[HIST_SIZE][MAX_CMDLINE_SIZE];
+    
+    char cmdline[MAX_CMDLINE_SIZE];
+    int max_cmdline, i;
+    struct literm_cmd *pcmd;
+
+    out->printf(welcome);
+
+    while (1) {
+begin:
+        pcmd = cmd_list;
+        max_cmdline = 0;
+        hist_cur = -1; /* -1 = no hist used */
+
+        out->printf("\r\n%s",prompt);
+        do {
+            if (out->readable()) {
+                cmdline[max_cmdline] = out->getc();
+                
+                if (cmdline[max_cmdline] == 3)
+                    goto begin;
+                if (cmdline[max_cmdline] == 4)
+                    goto exit;
+                if (cmdline[max_cmdline] == 8 || cmdline[max_cmdline] == 127) {
+                    if (max_cmdline > 0) {
+                        max_cmdline--;
+                        cmdline[max_cmdline] = '\0';
+                        redraw(cmdline);
+                    }
+                } else if (cmdline[max_cmdline] == 27) {
+                    out->getc(); /* trash useless value */
+                    char tmp = out->getc();
+                    if (tmp == 65) { /* up */
+                        if (hist_cur != hist_end && hist_begin != -1) {
+                            if (hist_cur == -1)
+                                hist_cur = hist_begin;
+                            else
+                                hist_cur--;
+                            if (hist_cur < 0)
+                                hist_cur = HIST_SIZE - 1;
+                            redraw(hist[hist_cur]);
+                        }                    
+                    } else if (tmp == 66) { /* down */
+                        if (hist_cur != hist_begin) {
+                            hist_cur++;
+                            if(hist_cur >= HIST_SIZE)
+                                hist_cur = 0;
+                            redraw(hist[hist_cur]);
+                        }
+                    }
+                } else
+                    out->putc(cmdline[max_cmdline++]);
+            }
+        } while (cmdline[max_cmdline - 1] != 13);
+      
+        /* use a command from history */
+        if (hist_cur != -1) {
+            strncpy(cmdline, hist[hist_cur], MAX_CMDLINE_SIZE - 1);
+            max_cmdline = strlen(cmdline);
+            if (hist_cur == hist_begin)
+                goto proceed;
+        
+        /* use a new command */    
+        } else {
+            /* deal with empty lines */
+            if (max_cmdline < 2 && hist_cur == -1)
+                goto begin;
+      
+            cmdline[max_cmdline - 1] = '\0';  
+        }      
+          
+        /* Update History */
+        hist_begin++;
+        if (hist_begin >= HIST_SIZE) {
+            hist_begin = 0;
+            hist_full = 1;
+        }
+        if (hist_full)
+            hist_end++;
+        if (hist_end >= HIST_SIZE)
+            hist_end = 0;
+        strncpy(hist[hist_begin], cmdline, MAX_CMDLINE_SIZE - 1);
+                
+proceed:
+        for (i = 0; i < max_cmdline; ++i) {
+            if (cmdline[i] == ' ') {
+                cmdline[i] = '\0';
+                break;
+            }
+            if (cmdline[i] == '\0') {
+                cmdline[i + 1] = '\0';
+                break;
+            }
+        }
+        
+        while (strcmp(pcmd->name, cmdline) && pcmd != NULL)
+            pcmd = pcmd->prev;
+            
+        if (pcmd != NULL)
+                (*pcmd->func)(this, cmdline + i + 1);
+        else
+            out->printf("\r\n%s not found", cmdline);
+    }
+exit:
+    out->printf("\r\nExiting small cli\r\n");
+}
+
+literm_cmd* literm::get_cmds()
+{
+    return cmd_list;
+}
+
+Serial* literm::get_out()
+{
+    return out;
+}
+
+void literm::set_hostname(char *name)
+{
+    snprintf(prompt, sizeof(prompt) - 1, "%s > ", name);
+}
+
+void literm::set_welcome(char *message)
+{
+    snprintf(welcome, sizeof(welcome) - 1, "\r\n\r\n%s", message);
+}
+
+void literm::add_cmd(literm_cmd *_cmd)
+{
+    _cmd->prev = cmd_list;
+    cmd_list = _cmd;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/literm.h	Tue Oct 08 20:14:17 2013 +0000
@@ -0,0 +1,134 @@
+#ifndef _LITERM_H_
+#define _LITERM_H_
+
+#include "mbed.h"
+
+#define HIST_SIZE 5
+#define MAX_CMDLINE_SIZE 128
+
+class literm;
+
+struct literm_cmd {
+    char name[8];
+    char desc[64];
+    int (*func)(literm *, char *);
+    
+    literm_cmd *prev;
+};
+
+#define LITERM_CMD(_name, _desc)          \
+    struct literm_cmd _name##_cmd = {     \
+        .name = #_name,                 \
+        .desc = _desc,                  \
+        .func = do_##_name, };
+
+/** Small terminal class.
+ *  This class intends to provide a small terminal for the mbed. It supports the following features:
+ *    - Add command based on a name, a description and a callback
+ *    - Auto help command based on name and description declarations.
+ *    - Ctrl-C to clear written command.
+ *    - Delete last char with backspace (if VT100 supported).
+ *    - Exit the CLI with ctrl-D.
+ *    - Small History (with up and down arrows)
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "literm.h"
+ * 
+ * int do_get(literm *term, char * args)
+ * {
+ *     Serial *out = term->get_out();
+ *     
+ *     out->printf("\r\nGetting!");
+ *     
+ *     return 0;
+ * }
+ * 
+ * int do_set(literm *term, char * args)
+ * {
+ *     Serial *out = term->get_out();
+ * 
+ *     out->printf("\r\nSetting!");
+ *     
+ *     return 0;
+ * }
+ * 
+ * LITERM_CMD(get, "getting something");
+ * LITERM_CMD(set, "setting something");
+ * 
+ * int main() 
+ * {
+ *     Serial pc(USBTX, USBRX);
+ *     literm term(&pc);
+ *     
+ *     pc.baud(115200);
+ *     pc.format(8, Serial::None, 1);
+ *    
+ *     term.set_hostname("mbed cli 1");
+ *     term.set_welcome("Bonjour et bienvenue!");
+ *     
+ *     term.add_cmd(&get_cmd);
+ *     term.add_cmd(&set_cmd);
+ *     term.loop();
+ *     
+ *     term.set_hostname("mbed cli 2");
+ *     term.loop();
+ * }
+ * @endcode
+ */
+class literm
+{
+
+ public:
+ 
+    /** Create a literm instance.
+     * @param _out serial output used to print and received
+     */
+    literm(Serial * _out);
+    
+    /** Versatile loop which start and manage the cli.
+     */
+    void loop();
+    
+    /** Set the hostname used by the cli.
+     *
+     * @param name hostname to use, must be < 12 chars
+     */
+    void set_hostname(char *name);
+    
+    /** Set the welcome message used by the cli.
+     *
+     * @param message welcome message to use, must be < 126 chars
+     */
+    void set_welcome(char *message);
+    
+    /** Add a command to the smal command line.
+     *
+     * @param _cmd pointer to a command to add. Commands are created with LITERM_CMD macro
+     */
+    void add_cmd(literm_cmd *_cmd);
+    
+    /** Return a pointer to the command stack.
+     *
+     * @returns stack command pointer
+     */
+    literm_cmd* get_cmds();
+    
+    /** Return a pointer to the Serial used as input/output for cli.
+     *
+     * @returns serial input/ouput 
+     */
+    Serial * get_out();
+
+ private:
+    Serial *out;
+    char prompt[16];
+    char welcome[128];
+    
+    void redraw(const char* line);
+    literm_cmd *cmd_list;
+    literm_cmd help_cmd;
+};
+
+#endif