Adding history builtin

1 files changed, 101 insertions, 0 deletions

diff --git a/share/functions/history.fish b/share/functions/history.fish
new file mode 100644
index 00000000..71d714a5
--- /dev/null
+++ b/share/functions/history.fish
@@ -0,0 +1,101 @@
+#
+#Deletes an item from history
+#
+
+function history --description "Deletes an item from history"
+
+    set -l argc (count $argv)
+    set -l prefix_args ""
+    set -l contains_args ""
+
+    set -l delete 0
+    set -l clear 0
+
+    set -l search_mode none
+
+    if test $argc -gt 0  
+        for i in (seq $argc)
+            switch $argv[$i]
+                case --delete
+                    set delete 1
+                case --prefix
+                    set search_mode prefix
+                    set prefix_args $argv[(math $i + 1)]
+                case --contains
+                    set search_mode contains
+                    set contains_args $argv[(math $i + 1)]
+                case --clear
+                    set clear 1
+            end;
+        end;
+    end; 
+
+    if test $delete = 1
+        set -l found_items ""
+        switch $search_mode
+            case prefix
+                set found_items (builtin history --search --prefix $prefix_args)
+            case contains
+                set found_items (builtin history --search --contains $contains_args)
+            case none
+                builtin history $argv
+                return 0 
+        end;
+        
+        set found_items_count (count $found_items)
+        if test $found_items_count -gt 0 
+            printf "Delete which entries ?\n"
+            printf "[0] cancel\n"
+            printf "[1] all\n\n"
+            
+            for i in (seq $found_items_count)
+                printf "[%s] %s \n" (math $i + 1) $found_items[$i]
+            end;
+
+            read choice
+            set choice (echo $choice | tr " " "\n") 
+
+            for i in $choice
+                echo $i | grep -q "^[0-9]*\$"
+
+                #Following two validations could be embedded with "and" but I find the syntax kind of weird. 
+                if test $status -ne 0
+                    printf "Invalid input: %s\n" $i 
+                    continue; 
+                end;
+ 
+                if test $i -gt (math $found_items_count + 1)
+                    printf "Invalid input : %s\n" $i 
+                    continue
+                end;
+                
+                if test $i = "0"
+                    printf "Cancel\n"
+                    return 
+                else
+                    if test $i = "1"
+                        for item in $found_items
+                            builtin history --delete $item
+                        end;
+                        printf "Deleted all!\n"
+                        return 
+                    else
+                        builtin history --delete $found_items[(math $i - 1)]
+                    end;
+                end;
+            end;
+         end;
+    else
+        if test $clear = 1
+            echo "Are you sure you want to clear history ? (y/n)"
+            read ch
+            if test $ch = "y"
+                builtin history $argv
+                echo "History cleared!"
+            end;
+        else 
+            builtin history $argv
+        end;
+    end; 
+
+end;