From 98e6b941ef031228d2412d5c940961ab2e088f44 Mon Sep 17 00:00:00 2001
From: Andy Williams <andy@andywilliams.me>
Date: Sun, 10 Jan 2016 13:28:27 +0000
Subject: [PATCH] [commandline] add an eval option

Pass it through to the main equate eval engine and output result.
---
 src/calc.h       |  4 ++++
 src/calc.y       | 17 ++++++++++++++++-
 src/calc_parse.c | 17 ++++++++++++++++-
 src/main.c       | 15 +++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/src/calc.h b/src/calc.h
index cd8e190..e0ff6a6 100644
--- a/src/calc.h
+++ b/src/calc.h
@@ -1,11 +1,15 @@
 #ifndef _EQUATE_CALC_H
 #define _EQUATE_CALC_H
 
+#include <Eina.h>
+
 /* Functions the gui calls                           */
 void            equate_clear(void);
 int             equate_append(char *str);
 double          equate_eval(void);
 const char     *equate_string_get(void);
+Eina_Bool	equate_ok(void);
+
 
 /* Fonctions type.                                   */
 typedef double  (*func_t) (double);
diff --git a/src/calc.y b/src/calc.y
index 5d95698..d025726 100644
--- a/src/calc.y
+++ b/src/calc.y
@@ -53,9 +53,12 @@ exp:      NUM                  { $$ = $1;                         }
 %%
 #include "calc_lex.c"
 
+static Eina_Bool yyerror_found;
+
 void
 yyerror(const char *s)
 {                               /* Called by yyparse on error */
+   yyerror_found = EINA_TRUE;
    printf("%s\n", s);
 }
 
@@ -68,6 +71,7 @@ yyresult(void)
 void
 equate_clear(void)
 {
+   yyerror_found = EINA_FALSE;
    yy_scan_string("0");
    yyparse();
    tmp[0] = '\0';
@@ -103,7 +107,18 @@ equate_eval(void)
    tmp[0] = '\0';
    return yyresult();
 }
-const char * equate_string_get(void) { return(tmp); }
+
+Eina_Bool
+equate_ok(void)
+{
+   return !yyerror_found;
+}
+
+const char *
+equate_string_get(void)
+{
+   return(tmp);
+}
 
 struct init {
    char           *fname;
diff --git a/src/calc_parse.c b/src/calc_parse.c
index 88cf797..bf7bc2c 100644
--- a/src/calc_parse.c
+++ b/src/calc_parse.c
@@ -1264,9 +1264,12 @@ yyreturn:
 
 #include "calc_lex.c"
 
+static Eina_Bool yyerror_found;
+
 void
 yyerror(const char *s)
 {                               /* Called by yyparse on error */
+   yyerror_found = EINA_TRUE;
    printf("%s\n", s);
 }
 
@@ -1279,6 +1282,7 @@ yyresult(void)
 void
 equate_clear(void)
 {
+   yyerror_found = EINA_FALSE;
    yy_scan_string("0");
    yyparse();
    tmp[0] = '\0';
@@ -1314,7 +1318,18 @@ equate_eval(void)
    tmp[0] = '\0';
    return yyresult();
 }
-const char * equate_string_get(void) { return(tmp); }
+
+Eina_Bool
+equate_ok(void)
+{
+   return !yyerror_found;
+}
+
+const char *
+equate_string_get(void)
+{
+   return(tmp);
+}
 
 struct init {
    char           *fname;
diff --git a/src/main.c b/src/main.c
index 1f86b2f..ed3c94b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -305,6 +305,8 @@ static const Ecore_Getopt optdesc = {
   "A calculator written with Enlightenment Foundation Libraries",
   EINA_TRUE,
   {
+    ECORE_GETOPT_STORE_DEF_STR('e', "eval", "Evaluate expression and print result",
+       NULL),
 //    ECORE_GETOPT_LICENSE('L', "license"),
     ECORE_GETOPT_COPYRIGHT('C', "copyright"),
     ECORE_GETOPT_VERSION('V', "version"),
@@ -318,8 +320,10 @@ elm_main(int argc, char **argv)
 {
    int args;
    Eina_Bool quit_option = EINA_FALSE;
+   char *eval_option = NULL;
 
    Ecore_Getopt_Value values[] = {
+     ECORE_GETOPT_VALUE_STR(eval_option),
 //     ECORE_GETOPT_VALUE_BOOL(quit_option),
      ECORE_GETOPT_VALUE_BOOL(quit_option),
      ECORE_GETOPT_VALUE_BOOL(quit_option),
@@ -333,6 +337,17 @@ elm_main(int argc, char **argv)
         EINA_LOG_CRIT("Could not parse arguments.");
         return 1;
      }
+   else if (eval_option)
+     {
+        double result;
+
+        equate_append(eval_option);
+        result = equate_eval();
+        if (equate_ok())
+           printf("%.10g\n", result);
+
+        return !equate_ok();
+     }
    else if (quit_option)
      {
         return 0;