Base: Add some default completions to shellrc

Base/etc/shellrc

@@ -43,3 +43,5 @@ export HISTORY_AUTOSAVE_TIME_MS=10000
 export TMPDIR=/tmp
 
 PROGRAMS_ALLOWED_TO_MODIFY_DEFAULT_TERMIOS=(stty)
+
+for /usr/share/shell/completion/*.sh { source $it }

Base/usr/share/shell/completion/builtin.sh

@@ -0,0 +1,76 @@
+#!/bin/Shell
+
+_complete_unalias() {
+    shift 2
+    argsparser_parse \
+        --add-positional-argument names --help-string _ --value-name _ --short-name '' --min 0 --max 9999 \
+        -- $*
+    name=''
+    if test ${length $names} -ne 0 {
+        name="$names[-1]"
+    }
+    invariant="${length $name}"
+    for $(alias | grep "^$name") {
+        n=${regex_replace '"' '\"' ${regex_replace '\\([^\\])' '\1' ${regex_replace '=.*' '' "$it"}}}
+        v=${regex_replace '"' '\"' ${regex_replace '\\([^\\])' '\1' ${regex_replace '[^=]*=' '' "$it"}}}
+        echo '{"kind":"plain","completion":"'"$n"'", "trailing_trivia":" ", "display_trivia":"'"$v"'", "invariant_offset": '$invariant'}'
+    }
+}
+
+__complete_job_spec() {
+    match $1 as hint {
+        %?* as (name) {
+            for $(jobs | grep "$name") {
+                id=''
+                match $it {
+                    [*]\ * as (i _) { id=$i }
+                    * { continue }
+                }
+                echo '{"kind":"plain","static_offset":'"${length "?$name"}"',"invariant_offset":0,"completion":"'"$id"'"}'
+            }
+        }
+        %* as (id) {
+            invariant=${length $id}
+            for $(jobs | grep "^\\[$id\\d+\\]") {
+                id=''
+                match $it {
+                    [*]\ * as (i _) { id=$i }
+                    * { continue }
+                }
+                echo '{"kind":"plain","static_offset":0,"invariant_offset":'"$invariant"',"completion":"'"$id"'"}'
+            }
+        }
+        (?<pid>^\d+$) {
+            invariant=${length $pid}
+            for $(ps -e | grep "^ *$pid") {
+                id=''
+                description=''
+                match $it {
+                    "*$pid* *" as (_ i rest) { id="$pid$i" description="$rest" }
+                    * { continue }
+                }
+                echo '{"kind":"plain","static_offset":0,"invariant_offset":'"$invariant"',"completion":"'"$id"'","display_trivia":"'"$description"'"}'
+            }
+        }
+        * as (name) {
+            static="${length $name}"
+            for $(ps -e | grep "$name") {
+                id=''
+                description=''
+                match $it {
+                    (?: *(?<pid>\d+) (?<rest>.*)) { id="$pid" description="$rest" }
+                    * { continue }
+                }
+                echo '{"kind":"plain","static_offset":'"$static"',"invariant_offset":0,"completion":"'"$id"'","display_trivia":"'"$description"'","allow_commit_without_listing":false}'
+            }
+        }
+    }
+}
+
+_complete_kill() {
+  if test $*[-1] = '--' {
+    __complete_job_spec ''
+  } else {
+    __complete_job_spec $*[-1]
+  }
+}

Base/usr/share/shell/completion/proxy.sh

@@ -0,0 +1,30 @@
+#!/bin/Shell
+
+__proxy() {
+    echo '{"kind":"proxy","argv":"'"${regex_replace '"' '\"' "$*"}"'"}'
+}
+
+# Builtins
+_complete_time() {
+    shift 2
+    argsparser_parse \
+        --add-option _ --help-string "Number of iterations" \
+          --long-name iterations --short-name n --value-name iterations --type u32 \
+        --add-positional-argument argv --help-string _ \
+          --value-name _ --min 0 --max 9999999 \
+        --stop-on-first-non-option \
+        -- $*
+    __proxy $argv
+}
+
+# Utilities
+_complete_pls() {
+    shift 2
+    argsparser_parse \
+        --add-option _ --help-string "User to execute as" --short-name u --value-name UID \
+        --add-positional-argument argv --help-string "Command to run at elevated privilege level" \
+          --value-name command --min 0 --max 999999 \
+        --stop-on-first-non-option \
+        -- $*
+    __proxy $argv
+}

Meta/lint-shell-scripts.sh

@@ -12,7 +12,9 @@ if [ "$#" -eq "0" ]; then
             ':!:Ports' \
             ':!:Userland/Shell/Tests' \
             ':!:Base/home/anon/Tests' \
-            ':!:Base/root/generate_manpages.sh'
+            ':!:Base/root/generate_manpages.sh' \
+            ':!:Base/usr/share/shell' \
+            ':!:Base/etc/shellrc' \
     )
 else
     files=()