diff options
| -rw-r--r-- | doc/manual/expressions/language-values.xml | 9 | ||||
| -rw-r--r-- | src/libexpr/lexer.l | 2 | ||||
| -rw-r--r-- | src/libexpr/parser.y | 10 |
3 files changed, 19 insertions, 2 deletions
diff --git a/doc/manual/expressions/language-values.xml b/doc/manual/expressions/language-values.xml index c3514e58f..0bf6632d6 100644 --- a/doc/manual/expressions/language-values.xml +++ b/doc/manual/expressions/language-values.xml @@ -155,7 +155,14 @@ stdenv.mkDerivation { expression that contained it. For instance, if a Nix expression in <filename>/foo/bar/bla.nix</filename> refers to <filename>../xyzzy/fnord.nix</filename>, the absolute path is - <filename>/foo/xyzzy/fnord.nix</filename>.</para></listitem> + <filename>/foo/xyzzy/fnord.nix</filename>.</para> + + <para>If the first component of a path is a <literal>~</literal>, + it is interpreted as if the rest of the path were relative to the + user's home directory. e.g. <filename>~/foo</filename> would be + equivalent to <filename>/home/edolstra/foo</filename> for a user + whose home directory is <filename>/home/edolstra</filename>. + </para></listitem> <listitem><para><emphasis>Booleans</emphasis> with values <literal>true</literal> and diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l index 82520ee7a..705190900 100644 --- a/src/libexpr/lexer.l +++ b/src/libexpr/lexer.l @@ -80,6 +80,7 @@ static Expr * unescapeStr(SymbolTable & symbols, const char * s) ID [a-zA-Z\_][a-zA-Z0-9\_\'\-]* INT [0-9]+ PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+ +HPATH \~(\/[a-zA-Z0-9\.\_\-\+]+)+ SPATH \<[a-zA-Z0-9\.\_\-\+]+(\/[a-zA-Z0-9\.\_\-\+]+)*\> URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']+ @@ -159,6 +160,7 @@ or { return OR_KW; } <IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */ {PATH} { yylval->path = strdup(yytext); return PATH; } +{HPATH} { yylval->path = strdup(yytext); return HPATH; } {SPATH} { yylval->path = strdup(yytext); return SPATH; } {URI} { yylval->uri = strdup(yytext); return URI; } diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y index 7d877cd67..f4648b902 100644 --- a/src/libexpr/parser.y +++ b/src/libexpr/parser.y @@ -268,7 +268,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err %token <id> ID ATTRPATH %token <e> STR IND_STR %token <n> INT -%token <path> PATH SPATH +%token <path> PATH HPATH SPATH %token <uri> URI %token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL OR_KW %token DOLLAR_CURLY /* == ${ */ @@ -376,6 +376,14 @@ expr_simple $$ = stripIndentation(CUR_POS, data->symbols, *$2); } | PATH { $$ = new ExprPath(absPath($1, data->basePath)); } + | HPATH { + auto path = string{$1 + 1}; + $$ = new ExprConcatStrings(CUR_POS, false, new vector<Expr *>{ + new ExprPath("/"), + new ExprApp(new ExprVar(data->symbols.create("__getEnv")), + new ExprString(data->symbols.create("HOME"))), + new ExprString(data->symbols.create(path))}); + } | SPATH { string path($1 + 1, strlen($1) - 2); $$ = new ExprApp(CUR_POS, |