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<span class="Comment">//: Dead simple persistence.</span>
<span class="Comment">//: 'restore' - reads string from a file</span>
<span class="Comment">//: 'save' - writes string to a file</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
RESTORE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"restore"</span>] = RESTORE<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case RESTORE: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'restore' requires exactly one ingredient, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'restore' should be a literal string, but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>Current_scenario<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// do nothing in tests</span>
string filename = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
filename = to_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
string contents = slurp<span class="Delimiter">(</span><span class="Constant">"lesson/"</span>+filename<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>contents<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
else
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>new_mu_string<span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
string slurp<span class="Delimiter">(</span>const string& filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//? cerr << filename << '\n'; //? 1</span>
ostringstream result<span class="Delimiter">;</span>
ifstream fin<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
fin<span class="Delimiter">.</span>peek<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>!fin<span class="Delimiter">)</span> <span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span> <span class="Comment">// don't bother checking errno</span>
const int N = <span class="Constant">1024</span><span class="Delimiter">;</span>
char buf[N]<span class="Delimiter">;</span>
while <span class="Delimiter">(</span>!fin<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
bzero<span class="Delimiter">(</span>buf<span class="Delimiter">,</span> N<span class="Delimiter">);</span>
fin<span class="Delimiter">.</span>read<span class="Delimiter">(</span>buf<span class="Delimiter">,</span> N-<span class="Constant">1</span><span class="Delimiter">);</span> <span class="Comment">// leave at least one null</span>
result << buf<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
fin<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
<span class="CommentedCode">//? cerr << "=> " << result.str(); //? 1</span>
<span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
SAVE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"save"</span>] = SAVE<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case SAVE: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'save' requires exactly two ingredients, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'save' should be a literal string, but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": second ingredient of 'save' should be an address:array:character, but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>Current_scenario<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// do nothing in tests</span>
string filename = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
filename = to_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
ofstream fout<span class="Delimiter">((</span><span class="Constant">"lesson/"</span>+filename<span class="Delimiter">).</span>c_str<span class="Delimiter">());</span>
string contents = read_mu_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
fout << contents<span class="Delimiter">;</span>
fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>!exists<span class="Delimiter">(</span><span class="Constant">"lesson/.git"</span><span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Comment">// bug in git: git diff -q messes up --exit-code</span>
int status = system<span class="Delimiter">(</span><span class="Constant">"cd lesson; git add .; git diff HEAD --exit-code >/dev/null || git commit -a -m . >/dev/null"</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>status != <span class="Constant">0</span><span class="Delimiter">)</span>
raise << <span class="Constant">"error in commit: contents "</span> << contents << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
bool exists<span class="Delimiter">(</span>const string& filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
struct stat dummy<span class="Delimiter">;</span>
<span class="Identifier">return</span> <span class="Constant">0</span> == stat<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> &dummy<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
string to_string<span class="Delimiter">(</span>long long int x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
ostringstream tmp<span class="Delimiter">;</span>
tmp << x<span class="Delimiter">;</span>
<span class="Identifier">return</span> tmp<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Includes")</span>
<span class="PreProc">#include</span><span class="Constant"><sys/stat.h></span>
</pre>
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