start adding expansion utilities for exec

1 files changed, 59 insertions, 4 deletions

diff --git a/exec.c b/exec.c
index ac88463..7c2b8b5 100644
--- a/exec.c
+++ b/exec.c
@@ -1,6 +1,7 @@
 #include "lex.h"
 #include "parse.h"
 #include "typeutils.h"
+#include <stdlib.h>
 #include <string.h>
 
 typedef struct {
@@ -71,9 +72,6 @@ typedef struct {
 } ExpandedChunk;
 
 
-
-
-
 ExpandedChunk expand_chunk(Chunk chunk, ShellState* shstate) {
     char* content;
     if (chunk.qmode == SINGLE_Q || chunk.kind == LITERAL) {
@@ -87,13 +85,70 @@ ExpandedChunk expand_chunk(Chunk chunk, ShellState* shstate) {
     return (ExpandedChunk){.qmode = chunk.qmode, .content = content};
 }
 
-char* expand_token(Token token, ShellState* shstate) {
+DECLARE_VEC(char*, StrVec)
+
+
+typedef struct {
+    StrVec complete_strs;
+    String active_str;
+} WordSplittingGerm;
+
+void add_expchunk(char* next_str, WordSplittingGerm* curr_res) {
+     for (int pos = 0; pos < strlen(next_str); pos++) {
+        if (next_str[pos] == ' ') {
+            push_to_StrVec(&curr_res->complete_strs, inner(&curr_res->active_str));
+            curr_res->active_str = make_String(256);
+        } else {
+            push_to_String(&curr_res->active_str, next_str[pos]);
+        }
+    }
+}
+
+StrVec expand_word(Word word, ShellState* state) {
+    WordSplittingGerm curr_res = {.complete_strs = make_StrVec(256), .active_str = make_String(25)};
+    for (int i = 0; i < word.count; i++) {
+        Chunk curr_cunk = *get_from_Word(&word, i);
+        ExpandedChunk curr_exp = expand_chunk(curr_cunk, state);
+        switch (curr_exp.qmode) {
+            case UN_Q:
+                add_expchunk(curr_exp.content, &curr_res);
+                break;
+            case SINGLE_Q:
+                append_str_to_String(&curr_res.active_str, curr_exp.content);
+                break;
+            case DOUBLE_Q:
+                append_str_to_String(&curr_res.active_str, curr_exp.content);
+        }
+    }
+
+    if (curr_res.active_str.count > 0) {
+        push_to_StrVec(&curr_res.complete_strs, inner(&curr_res.active_str));
+    }
+
+    return curr_res.complete_strs;
+   
+    /*
+    char** res_ptr = malloc(sizeof(char*) * curr_res.complete_strs.count);
+    for (int j = 0; j < curr_res.complete_strs.count; j++) {
+        res_ptr[j] = curr_res.complete_strs.blocks[j / curr_res.complete_strs.block_size][j % curr_res.complete_strs.block_size];
+    }
+    return res_ptr;
+    */
+}
+
+char** expand_token(Token token, ShellState* shstate) {
+    // TODO: alias expansion
+    
+
 
     // TODO: make some kind of extractor for the Vec-s that returns a regular T*-type NULL-term array
     // TODO: we need to split strs on spaces
     exit(1);
 }
 
+void command_thing(Command command, ShellState* shtate) {
+    char**
+}
 
 void run_pipeline(Pipeline pl, ShellState* shstate) {