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Shell: Implement a "cd history" (cdh) builtin

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`cdh` with no arguments dumps the last 8 cd calls in history, and
`cdh [index]` can be used to cd to re-run a specific index from that
history. `cdh` itself it a thin wrapper of the `cd` builtin.

There's definitely some improvements that can be made for this command,
but this seems like a good starting point for getting a feel for it and
ideas for changing it in the future.

It's not entirely clear whether we should be storing the resolved path -
or simply just the last argument passed to cd. For now we just use the
last path passed into cd as this seemed like the better option for now.

This means:
 * invalid paths will still be stored in history (potentially useful)
 * cdh's can be repeated for duplicate directory names
 * the history looks a little nicer on the eyes

It might make sense to use resolved paths.

Closes #397
This commit is contained in:
Shannon Booth 2020-02-23 13:06:29 +13:00 committed by Andreas Kling
parent 5e817ee678
commit d0fb816ac3
Notes: sideshowbarker 2024-07-19 08:48:50 +09:00 
Author: https://github.com/shannonbooth
Commit: https://github.com/SerenityOS/serenity/commit/d0fb816ac39
Pull-request: https://github.com/SerenityOS/serenity/pull/1279
Issue: https://github.com/SerenityOS/serenity/issues/397
Reviewed-by: https://github.com/awesomekling
2 changed files with 41 additions and 0 deletions
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2
Shell/GlobalState.h
View file

@ -28,6 +28,7 @@
#include <AK/String.h>
#include <AK/Vector.h>
#include <AK/CircularQueue.h>
#include <termios.h>
struct GlobalState {
@ -43,6 +44,7 @@ struct GlobalState {
bool was_resized { false };
int last_return_code { 0 };
Vector<String> directory_stack;
CircularQueue<String, 8> cd_history; // FIXME: have a configurable cd history length
};
extern GlobalState g;

39
Shell/main.cpp
View file

@ -191,7 +191,11 @@ static int sh_cd(int argc, const char** argv)
if (argc == 1) {
new_path = g.home;
if (g.cd_history.is_empty() || g.cd_history.last() != g.home)
g.cd_history.enqueue(g.home);
} else {
if (g.cd_history.is_empty() || g.cd_history.last() != argv[1])
g.cd_history.enqueue(argv[1]);
if (strcmp(argv[1], "-") == 0) {
char* oldpwd = getenv("OLDPWD");
if (oldpwd == nullptr)
@ -241,6 +245,37 @@ static int sh_cd(int argc, const char** argv)
return 0;
}
static int sh_cdh(int argc, const char** argv)
{
if (argc > 2) {
fprintf(stderr, "usage: cdh [index]\n");
return 1;
}
if (argc == 1) {
if (g.cd_history.size() == 0) {
printf("cdh: no history available\n");
return 0;
}
for (int i = g.cd_history.size() - 1; i >= 0; --i)
printf("%lu: %s\n", g.cd_history.size() - i, g.cd_history.at(i).characters());
return 0;
}
bool ok;
size_t cd_history_index = String(argv[1]).to_uint(ok);
if (!ok || cd_history_index < 1 || cd_history_index > g.cd_history.size()) {
fprintf(stderr, "usage: cdh [index]\n");
return 1;
}
const char* path = g.cd_history.at(g.cd_history.size() - cd_history_index).characters();
const char* cd_args[] = { "cd", path };
return sh_cd(2, cd_args);
}
static int sh_history(int, const char**)
{
for (size_t i = 0; i < editor.history().size(); ++i) {
@ -489,6 +524,10 @@ static bool handle_builtin(int argc, const char** argv, int& retval)
retval = sh_cd(argc, argv);
return true;
}
if (!strcmp(argv[0], "cdh")) {
retval = sh_cdh(argc, argv);
return true;
}
if (!strcmp(argv[0], "pwd")) {
retval = sh_pwd(argc, argv);
return true;